Why Does My Tankless Water Heater Keep Shutting Off?

My Tankless Water Heater Keeps Shutting Off

  • Having made the decision to update your hot water heater to a tankless type, congrats! A tankless water heater offers a number of significant advantages. However, like with many appliances, it is not without flaws and may necessitate some minor repairs from time to time. We’ve experienced a number of issues when working on tankless water heater systems for our clients in the Atlanta region, and we’ve listed some of the more prevalent ones below. The tankless water heater keeps shutting down
  • the water heater becomes extremely cold
  • the tankless water heater will not ignite
  • and other issues.

Electric Tankless Water Heater Keeps Shutting Off

  • There are a few possible reasons why your electric tankless water heater may be shutting down. It might be anything as simple as a stray wire that is the problem. It is highly recommended that you contact a plumber immediately if you feel this is the problem.
  • Examine whether or not the heater is receiving power, gas, and water.
  • Check the filter to ensure that it is not clogged with debris
  • Finally, it’s possible that the issue is related to a low water flow rate. There is a minimum flow rate requirement for certain tankless water heaters, and if that amount is not met, the water heater will not switch on. As a result, you can experiment with reducing the water temperature to check if the device remains operational.

Tankless Water Heater Suddenly Cold

  • In the event that your tankless water heater appears to have ran out of hot water, leaving you with a chilly shower, you may be suffering from ″cold water sandwich.″ This occurs when the water heater alternates between releasing hot water and then cold water, and then back to hot water, and so on and so on It’s a regular problem with electric tankless water heaters, but it can happen with gas tankless water heaters on occasion as well. What might be the source of this issue? Numerous concerns are involved, for example. There might be an issue with the flow sensor
  • the filter could be filthy or clogged with debris
  • Corroded lines
  • corrosion on the lines
  • There was a difficulty with the heat exchanger
  • the venting pipes were not correctly placed
  • etc.
  • During the installation process, the incorrect size gas lines were used.

This is a problem that should be dealt with by a professional plumber in this situation.

Gas Tankless Water Heater Ignition Failure

  • It’s possible that two things are going on here.
  • 1.
  • The ″No Ignition″ problem message appears.
  • This indicates that the mechanism is attempting to ignite but has been unsuccessful.

The problem might be that the supply of gas to the unit has been halted, or if the gas is flowing from a propane tank, the problem could be that the supply of gas has been depleted completely.It’s possible that the problem is related to venting.Flame Failure is the error message displayed in step two.This error message usually indicates that there is an issue with the gas pressure.This might be caused by a number of problems, including the regulator, the size of the gas line, venting issues, combustion issues, and others.

This error message might possibly indicate that the equipment is experiencing an electrical problem.No matter which of these issues you are facing, it is strongly suggested that you call a professional plumber to analyze the situation and make recommendations for solutions.770-505-8570 If you have any queries concerning tankless water heaters, please do not hesitate to contact Atlantis Plumbing now.We are accessible 24 hours a day, 7 days a week to answer your questions.

We Offer Tankless Water Heater Services in Metro Atlanta and Surrounding Areas

  • Fulton County, Bartow County, Cobb County, Paulding County, Cherokee County, Gwinnett County, and Douglas County are among the counties that make up the metro area.
  • Acworth GA, Atlanta GA, Austell GA, Cartersville GA, Doraville GA, Douglasville GA, Hiram GA, Kennesaw GA, Lawrenceville GA, Lithia Springs GA, Loganville GA, Mableton GA, Powder Springs GA, Rockmart GA, Smyrna GA, Tucker GA, Villa Rica GA, Vinings GA, Woodstock GA, and Surrounding Communities

3 Tankless Water Heater Problems (and How to Solve Them)

  • Do you have a tankless water heater that isn’t working correctly? If that’s the case, we’re here to assist you. In this essay, we’ll cover the following topics: Three frequent tankless water heater concerns are as follows:
  • The underlying issue that is causing these complaints
  • What to do in order to resolve the issues

Do you require skilled tankless water heater assistance? Simply get in touch with us.

1. “My tankless water heater runs hot, then cold, then hot again.”

The problem behind the complaint?

  • This is a regular tankless issue known as a ″cold water sandwich,″ which means ″cold water sandwich.″ The heat exchanger (the component responsible for heating the water) takes a long time to warm up, which results in this problem occurring.
  • You’ll receive a short burst of cold water before it’s totally warmed up and ready to start heating the water.
  • As soon as the heat exchanger reaches operating temperature, a constant stream of warm water is delivered.
  • How does the initial burst of hot water arrive?

What is the source of the hot water?It’s true that, in most cases, there is still hot or warm water in the faucet from the appliance’s previous hot water run.

How to solve the problem:

  • If you experience the ″hot water, cold water, hot water″ surprise, contact with a specialist to determine whether you should combine your tankless unit with a ″small″ tank water heater to prevent this from happening again.
  • While the heat exchanger in your tankless water heater is warming up, you may use hot water from the small tank water heater.
  • This eliminates the dreaded ″cold water sandwich″ and significantly reduces the amount of time you spend waiting for hot water.

2. “I’m not getting any hot water from my tankless water heater.”

The problem behind the complaint?

  • A variety of various tankless water heater issues might result in you losing access to all of your hot water. In the first instance, regardless of whether you have a gas or an electric tankless unit, it’s possible that you’re just pushing the unit to its limitations. Given that tankless units only heat water when it is required, running too many hot water appliances at the same time may cause the unit to get overworked and malfunction. It is possible that you may receive hot/lukewarm water in the shower and dishwasher while also trying to wash your hands at the same time. A larger issue, such as a clogged heat exchanger (due to hard water), a clogged vent/air intake, gas supply difficulties, a bad ignitor/flame rod, or dirty burners, might be the source of your ″no hot water″ problem. If this is the case, call your local plumber.

How to solve the problem:

  • Start by just using one hot water appliance at a time to see if it helps.
  • If you are getting hot water even when only one hot water appliance is operating, see a plumber to determine whether you need to upgrade to a tankless unit with a greater flow rate.
  • If you have a gas tankless unit and you are experiencing no hot water when only one hot water appliance is running, conduct the following checks:
  1. You’ve paid your gas bill (since your tankless water heater cannot heat water unless there is a consistent supply of gas! )
  2. Is there no obstruction in your water heater vent (be careful, as they tend to be up high on your home’s roof)
  3. This means that the gas valve that supplies your tankless unit is turned on, not off.
  4. You’ve decided to schedule regular maintenance. Other tankless issues will be caught or prevented if you have frequent maintenance performed. In addition, your plumber may propose that you install a water softener to counteract hard water.

Still haven’t gotten any hot water? Have an expert check the device to determine the source of the problem and correct it.

3. “My tankless water heater shuts off during showers.”

The problem behind the complaint?

  • In the case of an older tankless water heater (more than ten years old), the problem is most likely due to the minimum flow rate being set at an excessively high level.
  • You see, every tankless water heater has a minimum ″flow rate,″ which is the quantity of water, measured in gallons per minute (gpm), that the tankless unit need to flow through it in order to create hot water.
  • If the amount of hot water you’re requesting is less than the minimum flow rate for your unit, it’s likely that your unit is shutting down automatically as a safety measure.
  • As you can see, if there isn’t enough cold water going over the heat exchanger, it can overheat and cause damage.

As a result, in order to prevent damage to the heat exchanger (as well as scorching you with extremely hot water), your tankless unit will automatically shut down, leaving you with cold water in the middle of your shower.

How to solve the problem:

If this is a recurring problem, see a plumber to determine whether you should upgrade your unit. Most older water heaters have a minimum flow rate of 1/2 to 3/4 gpm at their most basic setting. Newer units, on the other hand, have extremely low minimum flow rates (as low as 14 gpm), which means that your unit will continue to operate even when there is just a tiny demand for hot water.

Need professional tankless water heater repair in Phoenix?

Simply get in touch with us. We provide plumbing repairs 24 hours a day, seven days a week by qualified, green plumbers you can rely on.

Why You Get Cold Water

  • Not a day would go by without someone complaining about their tankless water heater becoming cold in the midst of a shower a few years ago, when the amazing tankless water heaters of today were not yet available.
  • Similar issues continue to crop up in today’s world, and the majority of the time, the solution is straightforward.
  • The most typical reason of this problem is that the hot water flow falls below the minimum water flow necessary by the unit in order for it to continue to operate.
  • In order to change the ultimate water temperature coming out of your shower head, you may reduce the hot water flow rate.

Tankless water heaters that are inexpensive can have high minimum flow rates, such as 1 gallon per minute or 1 gallon per minute.It is not a significant deal if the flow rate drops below this level.Better models have flow rates of up to 0.5 gpm, which is still rather high.Tankless water heaters from Rheem and Rianni are the most efficient in this regard.Even if the flow rate drops to 0.26 gpm, they are still able to heat the water.

These two brands are the least likely to catch you off guard with a chilly shower experience.There is a second possibility that might cause your tankless water heater to cease working, albeit it is considerably less common than the first.In the South, where the incoming water temperature can be as high as 75°F, you only need a temperature rise of 25°F to feel comfortable taking a shower in the summer.If you want 1 gpm of hot water flow, the minimum flow rate of the water heater is satisfied, and you would expect the water heater to not switch off as a result.Despite this, a 25°F temperature increase at a flow rate of 1 gpm requires a heat input of just 12,500 BTU.

  1. Wait a minute, the Rinni Ultra RUC98i, which is one of the greatest tankless water heaters on the market, has a minimum BTU of 15,200, which is ridiculous!
  2. Rather than sending you water that is hotter than you requested and risk scorching your skin, this machine would shut down.
  3. As a result, during a hot Southern summer, the temperature rise you seek may be too little for your tankless water heater to provide.
  4. To address this issue, increase the water flow rate or just take a cold shower for a change to relieve the discomfort.

We Didn’t Change Anything!

  • Sometimes individuals assert that they are not making any changes in the shower and that the water is becoming chilly without any apparent cause for this.
  • In the event that this occurs immediately after you begin using hot water, it is possible that you are suffering from the dreaded cold water sandwich.
  • The hot water from your last hot water pull is still sitting in the pipes.
  • While the hot water is flowing through the pipes when the tap is turned on, some cold water is passing through the water heater before the unit ignites and begins to heat up.

As a result, you receive hot water first, then cold, and finally hot.The problem is that many individuals will start fiddling with the shower handle as soon as cold water starts to flow from the shower head.It follows that the water flow varies, and you will experience variation after fluctuation in the water temperature as a result.To correct the situation, refrain from touching anything and let the large amount of cold water to run down the drain.If your tankless water heater is shutting down whenever someone opens or closes a cold water fixture, the problem might be with the temperature regulating valves that you have put anywhere in your water line, according to the manufacturer.

This type of valve automatically changes the hot water flow to prevent you from getting scalded by hot water if someone steals your cold water by opening a cold water faucet in your home or office.This causes the hot water supply to be curtailed, and the water heater believes that your shower has come to an end.It’s possible that you’ve acquired these valves from a previous owner of your property and are completely unaware that they exist.To summarize, the most effective approach to prevent all of these issues is to invest in a high-quality tankless water heater.Reading product reviews and conducting product research are both vital for making the best option possible.

What To Do If Your Gas Water Heater Keeps Shutting Off

It is possible that we might assist you if you have a water heater that is constantly switching itself off. In the event that your gas water heater shuts down for whatever reason, there are eight possibilities.

  1. Air inlet screen that is filthy or congested.
  2. A malfunctioning thermopile
  3. A thermocouple that is not working properly
  4. A gas valve that has failed to function properly
  5. Tank that is leaking
  6. A high level of humidity
  7. Exhaust vent that has become clogged
  8. The FVIR system is not functioning properly.
  • It is critical that these issues are addressed by a skilled plumber at this point.
  • Atlantis Plumbing is a plumbing company in the Atlanta, Georgia region that has these specialists on staff.
  • We are accessible 24 hours a day, 7 days a week to answer your questions.
  • Although you should be aware of the specifics of each of these probable causes for your hot water heater difficulties, as a responsible homeowner, you should be aware of the general nature of each of these causes.
See also:  What Is A Tankless Water Heater

1) A dirty or clogged air inlet screen is the source of the problem.The air intake screens on the gas water heaters that are being installed nowadays are standard.If this screen becomes clogged, it will be unable to perform its intended purpose.It will not allow enough air to get through, which is required to keep the gas burners operating properly.Your water heater’s drain valve is located at the bottom of the unit.

As is common with many appliances, they might become soiled and blocked as a result of this.Things such as dust, pet hair, lint, filth, and so on.Call in a professional plumber to clean and/or replace these air inlet screens so that they are properly functioning.2) A Thermopile that isn’t working properly It is most typically a metal rod situated close to the pilot burner that serves as the thermopile component of your water heater.Its function is to activate the gas controls, which are located on the gas meter.

  1. In essence, when the pilot light is turned on, the thermopile is heated by the flame and provides electrical energy for the purpose of powering the electronic components included inside the gas controls system.
  2. It will not be capable of powering up those components if this component becomes unclean for any cause at any time.
  3. As a reminder, we strongly advise that you contact a qualified plumber to thoroughly diagnose and clean any malfunctioning thermopiles on your water heater tank.
  4. 3) A faulty thermocouple is the source of the problem.

The thermocouple equipment is intended to be used as a safety device in the laboratory.When the pilot light goes out, it automatically switches off the gas supply.If the thermocouple in your water heater has a failure of some sort, the pilot light will simply not illuminate.Once again, we recommend that you engage a licensed plumber to assess and fix any problems that you may be experiencing with your water heater.4) A faulty gas valve must be replaced.This mechanism, which is located on the side of your gas hot water heater, is responsible for distributing gas to the water heater unit.

  1. This gas ignites the pilot light and the gas burners, which, as a result, heats the water in the tank to a comfortable temperature.
  2. As a result, if the valve has been damaged or cracked in any manner, you will experience a reduction in the amount of hot water available to you.
  3. It is better to leave the assessment of this problem to a skilled and knowledgeable plumber, such as those employed by Atlantis Plumbing.

5) Tank that is leaking The pilot light in a water heater tank that is leaking might be extinguished.Occasionally, the leak may only occur when the tank is heating up, which is rare.When water is heated, the volume of the water increases, putting pressure on the seams of the tank.You should contact a professional plumber as soon as you suspect or know that your water heater is leaking to get the problem fixed quickly.6) Extremely High Humidity Water heater tank sweating is caused by excessive humidity (which we do experience here in Georgia during the summer months), which causes water to fall onto the thermocouple, which then causes the water heater to fail.7) Exhaust vent that is obstructed A clogged vent in your hot water tank might cause the burner chamber to overheat, resulting in a faulty burner.

This results in the thermoresistor being completely destroyed.8) FVIR System that is not functioning properly (Flammable Vapor Ignition Resistant) When a flammable vapor ignition resistant system fails, it can prevent combustion air from reaching the heater, which can result in the pilot being extinguished when the burner is activated.If you are experiencing issues with your hot water heater, please contact us immediately at 770-505-8570.

We Offer Gas Water Heater Services in Metro Atlanta and Surrounding Areas

  • Fulton County, Bartow County, Cobb County, Paulding County, Cherokee County, Gwinnett County, and Douglas County are among the counties that make up the metro area.
  • Acworth GA, Atlanta GA, Austell GA, Cartersville GA, Doraville GA, Douglasville GA, Hiram GA, Kennesaw GA, Lawrenceville GA, Lithia Springs GA, Loganville GA, Mableton GA, Powder Springs GA, Rockmart GA, Smyrna GA, Tucker GA, Villa Rica GA, Vinings GA, Woodstock GA, and Surrounding Communities

Why Does My Water Heater Keep Turning Off? – 6 Reasons

  • Is it common for you to wonder, ″Why does my water heater keep shutting off?″ Many factors might cause a water heater to shut down on its own, reducing your ability to enjoy hot water and raising the possibility of harming the appliance.
  • Identifying the cause of the water heater shutting down on its own might assist you in efficiently addressing the problem.
  • This allows you to protect the integrity of the water heater while still allowing your family to benefit from the many advantages of having hot water.

What Causes a Gas Water Heater to Turn Off All the Time?

The following factors may contribute to your gas water heater’s inability to maintain a constant temperature.

Insufficient Gas Supply

  • A gas water heater, like a gas stove, is reliant on a consistent supply of gas to keep the burner operating properly and efficiently.
  • It would be difficult for your water heater to heat the water if it did not have access to a fuel source.
  • A faulty gas valve might possibly be the source of the problem.
  • The valve is responsible for regulating gas flow to the water heater’s burner — a duty that cannot be performed properly if the valve is broken.

Because of this, it is recommended that you check the gas supply valve to ensure that it is open and free of leaks.You may check for leaks by adding soapy water to the connectors and observing the results.The production of bubbles nearly often signals the presence of a leak.If you’re not sure, it’s advisable to have a plumber look at your water heater to be sure.

Bad or Dirty Thermocouple

Even if your gas valve is open and there are no leaks, it is a good idea to get your thermocouple checked out.This component is a safety mechanism that prevents gas from being sent to the burner if it does not detect heat from the pilot light.When you switch on your gas water heater, the pilot light ignites the gas burner, which begins the process of heating the water in the tank.The pilot light creates heat, which the thermocouple detects and uses to keep the gas supply to the pilot light flowing.

It guarantees that the water heater is operating properly.This can be caused by a malfunctioning, broken, or clogged thermocouple in your gas-powered hot water heater, which keeps shutting down.Examine the thermocouple adjacent to the pilot light to see whether it is dusty, bent, or otherwise damaged.

If so, replace it.If the thermocouple appears to be filthy, it may be necessary to clean it.After turning off the water heater and allowing the thermocouple to cool, you can sand the unclean surface of the thermocouple using fine-grit sandpaper to remove any remaining contaminants.In the event that it is necessary to replace it, please refer to this comprehensive instruction.Unfortunately, a thermocouple that has been broken or twisted will need to be replaced.

You may either do it yourself or hire a plumber to do it for you.

Dirty Pilot Light or Tube

Although it is not necessary to inspect the pilot tube at the same time as the thermocouple, it is advisable.After all, these elements are in close proximity to one another.In addition, while your water heater is running, you may check the pilot light.Look for a blue flame that is bright and consistent, with a flame height of around 3/8 to 12 inch.

Seeing a faint and flickering yellow flame indicates that the pilot tube is dusty or blocked, which should be investigated further.Inserting a needle into the pilot tube allows you to clean the tip and get access to the pilot tube.It should be able to remove soot and other material that has accumulated in the pipe.

If, on the other hand, your water heater continually shutting down, it might be advisable to call in a specialist.

Clogged or Dirty Air Inlet

Fire necessitates the presence of three critical ingredients: heat, fuel, and oxygen.It is for this reason that gas water heaters include an air entrance towards the bottom of the tank.Unfortunately, lint, soot, grime, dust, and pet hair can block air inlet screens, causing them to malfunction.You can experiment with eliminating these particles to see if the airflow to the burners improves.

Why Electric Water Heater Keeps Turning Off

Water Temperature’s Too High

Water heaters are equipped with a safety feature that prevents the device from operating if the water temperature is greater than the appliance’s rated capacity is detected.For example, if the water heater is only capable of withstanding temperatures up to 180 degrees Fahrenheit, adjusting the thermostat to 185 degrees Fahrenheit may cause the water heater to shut down.Additionally, a malfunctioning thermostat might result in high water temps.The thermostat regulates the amount of heat that is sent to the heating elements, allowing the water heater to heat the water to the desired temperature.

This function cannot be performed by a malfunctioning thermostat.It is unable to manage the temperature of the water, resulting in harmful rises in the temperature of the water.If you have reason to believe your water heater’s thermostat is malfunctioning, it is recommended to consult with a specialist.

Electrical Issues

Electrical components such as the thermometer, heating coil, and other electrical components may also be at fault if your electric water heater is constantly shutting down.In the absence of prior knowledge on how to operate a multimeter, pinpointing the specific problem will need a lot of trial and error.It is for this reason that it is recommended to delegate the electrical examination and troubleshooting to a qualified specialist.

How a Water Heater Works

Water heaters with storage tanks are supplied with cold water from the water supply line, which is connected to the water heater.The tank has two heating components that are regulated by thermostats, which govern the working temperature of the water heater as well as the temperature of the water being heated.Electricity warms these components, which in turn raises the temperature of the water.Heating components are not included in the price of gas-powered water heaters.

You might think of these water warmers as massive kettles that you can place on your stovetop.The water is heated by a gas burner at the bottom of the tank, making it suitable for use.Tankless water heaters do not have a storage tank to hold hot water throughout the winter.

Instead, cold water is circulated via a heat exchanger that is heated by electricity or gas to warm it up.As a result, any component involved in the water heating process might cause a water heater to repeatedly shut down.


  • If you find yourself wondering, ″Why does my water heater constantly going off?″ there are a variety of possible explanations. If you have a gas water heater, the shut-offs might be caused by one of the following: Clogged air intake due to malfunctioning gas valve, dirty or broken thermocouple, dirty pilot tube, and so on.
  • If the problem arises in an electric water heater, it might be caused by one of the following factors: higher water temperature than the water heater’s rated capacity
  • higher water temperature than the water heater’s rated capacity
  • Problems with the electrical system

When in doubt or when the problem persists, I recommend that you hire a plumber to inspect your water heater.

Why Does My Water Heater Keep Turning Off? Common Causes & Fixes

Have you ever found yourself standing at the faucet or in the shower, waiting for warm water, only to discover that it isn’t coming?Fortunately, many of these issues may be resolved quickly, saving you the expense of hiring a professional plumber to complete the repairs for you.In other cases, however, it is necessary to see a professional because attempting to resolve the problem yourself might put you in danger or cause damage to your water heater.If you have a water heater, whether it’s an electric water heater, a tankless water heater, or a gas water heater, and you’re thinking ″why does my water heater keep going off,″ then keep reading!

Electric Hot Water Heater Keeps Shutting Off (Common Causes & Fixes) 

  • Electric water heaters are used by the majority of houses in the United States, largely because they do not fail as frequently as gas water heaters. Malfunctions, on the other hand, may still occur. So in the event that your water heater breaks down unexpectedly, here are a few things you should know that may come in helpful. There is a common system that is shared by all electric heaters, and it is formed of the following components: Temperature control, heating element, electrical receptacle, and so on.

Any of the components listed above in your electric water heater might fail, resulting in the heater shutting down frequently. Here are a few signs of a defective electric water heater, as well as instructions on how to repair them:

Problem 1: Faulty Electric Supply 

The electrical receptacle is the most important component of the electrical system in your apartment. It is responsible for directing the electricity to the gadget. As a result, if your machine continues to trip, it is likely that the problem is with the electrical supply. Furthermore, keep in mind that even a faulty wall socket might be a serious problem.

How To Fix  

The water heater should be turned off immediately if you hear a cracking or buzzing sound when you first turn it on. This is done largely to avoid an explosion or a short circuit from occurring. After that, contact a skilled electrician because this might result in significant harm.

Problem 2: Bad Thermostat 

In your water heater, a thermostat is in charge of controlling both the bottom and higher heating components.When the water becomes too cold, it sends a signal back to the heating components, causing the water to be reheated.Furthermore, if you have a hybrid or HVAC system, you will see similarities between the thermostat on the HVAC unit and the thermostat on the hybrid system.The majority of electric heaters are equipped with two thermostats: a lower thermostat and an upper thermostat.

This is due to the fact that the device contains two pilot lights (heating components), and each of them requires a thermostat.

How To Fix 

  • The lower and higher thermostats should be located (see the handbook if necessary).
  • Check to see that they are both linked to electricity
  • To test whether the reset button works, look for it and push it a few times.
  • If the higher thermostat does not indicate power receipt, the thermostat should be replaced.
  • If, on the other hand, it indicates power reception but does not produce warm water, you will need to purchase a new heating element.
See also:  How Does A Tankless Water Heater Heat Water?

Problem 3: Heating Element Malfunction 

Heating components are responsible for heating the water when the thermostat calls for it.Unfortunately, it’s one of the most prevalent reasons of a heater that won’t stop turning itself off.There is a good risk that you will not receive warm water if the heating element malfunctions.This is due to the fact that if the heat source is not operational, the tank water will remain cold even if the rest of the system is operational.

How To Fix 

Call a plumber to replace the heating elements rather than attempting it yourself, primarily because it might result in an electrical short circuit if the parts are installed incorrectly.

Problem 4: Bad Reset Button 

If the reset button on your unit continues tripping, there’s a significant probability the problem is with the internal circuitry of the device.When the temperature of the water heater exceeds 180°F, the reset button on the device is intended to switch off the current to the unit.However, with regular usage, the switch might become worn out, making it harder for you to determine the exact temperature of the water in your bathtub.When this occurs, the reset key switch may be activated, resulting in the device losing power even if the water temperature is extremely low.

How To Fix

When the reset button begins to wear down, there is no other option except to replace the button. This is a typical request that may be immediately looked into by a professional in a short period of time.

Problem 5: Bad Wiring Or Breaker 

It’s possible that the issue is electrical in nature, such as poor wiring.Because of this, it may provide a serious safety threat.Fortunately, the heater is well-equipped to deal with any electrical mishaps that may occur.When you have a loose wire, it generates a lot of heat, which is bad.

Because the reset key is sensitive to excessive heat, it trips on its own without any user intervention.If you have copper wire (as in the water heater) and aluminum wiring, you may have additional wiring issues (in the house).

How To Fix

In such a circumstance, a lug compression connection must be precisely positioned where the wires come together to function. The two distinct metal connections may cause the breaker to trip if they are not connected with the proper lug connector. Another possibility is that your home’s internal breaker has been worn out, leading the reset key to trip when it should not.

Tankless Water Heater Keeps Shutting Off: Common Causes & Fixes 

Heating systems without a tank are unquestionably among the finest investments you can make for your workplace or home. Not only are they energy efficient, but they also help you save money by heating water on demand…. However, just like any other item, a tankless heater has its share of problems. So, here are a few possible explanations for why your tankless heater is always tripping:

Problem 1: Mineral Build-Up 

You should constantly keep track of any possible mineral build-up in your water heater system, whether you employ tankless water heaters or more conventional methods.This is due to the fact that hard water, as opposed to soft water, includes an extraordinarily high concentration of minerals.As a result, the harder the water, the greater the likelihood of mineral build-up!It is normal for minerals such as magnesium and calcium to create scaly deposits on the inside of tankless water heaters, which can have a detrimental impact on the functioning of these units over time.

How To Fix

  • The following are the steps to take to descale mineral buildup in your tankless water heater: Turn off and remove the device from the network
  • Activate the cold water shutoff valves
  • Remove or disable the valve that connects the gadget to the home.
  • By opening the purge valve, you can let some of the internal pressure out.
  • Ensure that the right hose lines are connected.
  • Reopen the purge process
  • Natural (non-synthetic) vinegar should be passed through the heater.
  • After that, flush the system with warm water and drain it completely
  • Close down the purge
  • Remove the hose lines from the system.
  • Reconnect the gadget to the water lines in the house
  • Make sure it’s turned on.

Problem 2: No Ignition And Flame Failure Message 

  • Ignition problems may be a real pain in the neck. In accordance with the water heater model, a notice stating ″no ignition″ should be shown. There might be a variety of causes for this, including: Gas supply is is insufficient
  • water or gas valves that are clogged
  • Furthermore, the indication indicating a flame failure is quite similar to the one indicating an ignition difficulty. Some of the factors that might contribute to flame failure difficulties include: small or thin gas lines that are unable to maintain a continuous flame
  • inadequate ventilation
  • and regulator malfunctions.

How To Fix

  • Here’s what you can do to resolve the situation: Shut off the gadget if it is still running
  • Make an attempt to restart it.
  • Now, attempt to operate it in a usual manner.

If it begins to heat up again, the problem may be traced back to the switch, and you should get it replaced by a trained specialist as soon as possible.

Problem 3: System Overload  

  • Another typical reason for tankless water heaters to stop down is due to overheating of the system. Your heater has a specific capacity and size that you must adhere to. Furthermore, if you are heating a substantial volume of water in excess of what is necessary, you are overloading the entire system. Are you still perplexed as to how? If you open numerous warm water taps or use various warm water systems at the same time, the heater may get overworked. Furthermore, overloading the unit is detrimental because: you will not have enough hot water
  • the unit may overheat and overwork
  • the unit may shut down
  • and the unit may fail.

How To Fix

  • Unfortunately, there are no low-cost solutions for this, especially if the excess capacity is a typical necessity on a regular basis for your business. As a result, consider the following alternatives: Reduce the amount of water used at the same time
  • Purchase an additional water heater
  • Increase the heating capability of the heater

Problem 4: Minimum Flow Rate 

For a tankless heater to function properly, or in other words, to provide the ″heating signal,″ the minimum flow rate specifies the amount of water that must be delivered.This problem happens when an old-school tankless heater is combined with a freshly installed eco-friendly showerhead, as in the example above.The showerheads are wonderful for the environment and for conserving water; unfortunately, they will not utilize enough water to preheat the tankless heater to its maximum capacity.In order to prevent this from happening, tankless water heaters turn off when they don’t have enough water.

How To Fix

  • There is no simple solution to this problem
  • nevertheless, there are steps you may take to ensure that there is sufficient water flow: Before acquiring a home, think about how you will use it and how many people will be living there.
  • Take into account the maximum flow rate permitted by the tank intake
  • Take into consideration the peak flow rate

Gas Hot Water Heater Keeps Turning Off: Main Reasons & Fixes 

Gas water heaters are relatively new in comparison to tankless and electric water heaters; nonetheless, they have gained in popularity over the past few years. This is due to the fact that these tankless gas heaters are both inexpensive and energy-efficient. Nonetheless, the following are some of the most typical causes of gas heater malfunctions:

Problem 1: The Pilot Burner Is In Bad Shape 

The pilot light of a gas heater is one of the most delicate components of the unit.A filthy pilot burner, on the other hand, is a major possibility as the source of the difficulty with the trip.Specifically, here’s how it works: When there is dirt or dust on a pilot light, it will automatically shut off, which will cause the entire gas heater to come to a halt.This is due to the fact that dust and debris will restrict airflow.

How To Fix

Because the cleanup procedure isn’t very uncomplicated, it’s advisable to hire a plumber and delegate the task to them instead. Even if you are able to relight the pilot light on your own, the problem will recur sooner or later. Finally, it has the potential to cause your complete gas heater to malfunction, resulting in further charges for yourself.

Problem 2: Faulty Thermopile 

It is a component that reacts to the pilot burner and begins to produce gas when the pilot is ignited. It is possible for a thermopile to malfunction in the same way that the pilot burner can if it is unclean or worn out. If the thermopile is unable to send the proper signals, the gas heater will not run, even if the pilot burner is operational.

How To Fix 

To their advantage, it is simple to replace, and a replacement thermopile is quite affordable. However, as was the case with the filthy pilot burner, it is preferable to have your plumber execute this work.

Problem 3: Dirty Or Clogged Air Inlet 

The air inlet of a gas heater is also an important component, and it, like the other two, is vulnerable to dust and grime. Primary job is to ensure that sufficient air is delivered to the primary burners…. The light will turn off if the tube is blocked or unclean because oxygen will not reach the light.

How To Fix

The most effective solution to eliminate this problem once and for all is to have your gas heater examined and maintained on a regular schedule. If it becomes blocked or unclean, the plumber may easily clean it without causing any inconvenience. Alternatively, you might attempt to do this task on your own.

Problem 4: Blocked Gas Supply 

It’s also conceivable that your water heater’s gas supply has been cut off, which would explain why it keeps shutting down.In order for gas heaters to function successfully and efficiently, they must have an uninterrupted gas supply to the pilot burner.The pilot burner, on the other hand, will be turned off if the gas supply is completely cut off or if the volume of gas reaching the burner is insufficient.

How To Fix

Inspect the gas valves to make sure they are not clogged with debris. In order to ensure that the gas gets to the pilot burner, there is no other realistic option.

People Also Ask (FAQs)

Why does my rheem water heater keep shutting off?  

If your Rheem water heater keeps shutting off, it’s likely that the thermocouple has been broken, twisted, or become dusty. As a result, inspect the thermocouple and, if it is broken, replace it immediately. If it’s dirty, on the other hand, just wash it up.

Do all hot water heaters have a reset button?  

Yes, all water heaters are equipped with reset buttons; you simply need to search around the unit to locate them. In most cases, it has a bright red hue and is situated next to the thermostat. Furthermore, it can be located buried under a removable metal plate or insulation, among other places.

Is it dangerous if the pilot light goes out on the water heater? 

In many cases, this is not a scenario that poses a serious threat. This is due to the fact that modern gas water heaters are equipped with valves that automatically shut off the gas supply when the pilot fire goes out.

What is the average cost to repair a water heater that keeps shutting off? 

You should expect to pay anything from $355 to $1750 to get your water heater repaired if it keeps shutting down. Thus, the average repair cost will be roughly $655 per incident. However, the cost of water heater repair varies depending on a variety of factors, including the age, kind, and warranty of your unit, as well as the contractor you use.


Water heaters, whether they are tankless, electric, or gas, are all subject to wear and tear over the course of their lifetime. There are a variety of reasons why your water heater keeps shutting down, and if you are experiencing any of the issues listed above, follow the steps in this tutorial to resolve the issue!

Common Tankless Water Heater Problems And How to Fix Them

More emphasis is being placed on the design of energy-efficient tankless water heaters as technology advances, allowing consumers to have fewer tankless water heater difficulties and to have less negative impacts on the environment as a result of the advancements in technology.When you turn on the faucet, tankless water heaters immediately begin heating the water.When the faucet is switched on, water flows through the pipes and the heating coil, which is powered by either gas or electricity, warms the water to the desired temperature.Because the water is heated just when it is needed, there is no heat loss.

If the connections are not made correctly in any unit, problems might develop.In this post, we will go over in detail the most typical difficulties experienced by owners of electric and gas tankless water heaters, as well as how to resolve these issues in the future.The debate over whether to use gas or electric tankless water heaters is a typical one.

Both have their advantages and disadvantages.In this section, we’ll look at some of the most typical problems that can occur with both types of units.Discussion of the most common issues that people have with their tankless water heaters will take place next.We will go through the pros and cons of tankless water heaters that are powered by electricity and natural gas.

Electric Tankless Water Heater Problems

Have you ever gotten into the shower anticipating a nice bath only to be greeted by chilly water splashes instead?This occurs as a result of a problem with your water heater of some form.What might be the source of this problem?The answer is a lengthy list, which we shall examine in further detail next.

The first step in troubleshooting is to open the unit and examine it for any defects that may have occurred.Don’t forget to turn off the electricity to the device before you do anything else.It is possible to have catastrophic consequences if you forget to do so.

We’ll go through all of the potential issues that might be hurting your hot water supply right here and now.

No Hot Water Supply

It is possible that the water heater will not function at all, resulting in just cold water coming out of all taps.This complete lack of hot water might be caused by a clogged heat exchanger as a result of hard water being utilized in the system.This clogging is avoided by flushing the toilet on a regular basis.The system will shut down if the vent becomes clogged, resulting in a lack of hot water being supplied.

If you have a gas tank-less water heater, make sure that your water heating equipment has the appropriate quantity of power supply to operate.When the supply of water falls short of the demand, problems with water heating will develop.Both a filthy burner and a faulty ignitor will cause the heating process to come to a halt.

This issue can be resolved by lowering the amount of water used.Try to restrict your water usage to a single faucet at a time if possible.If doing so resolves the issue, it indicates that the fault is with the demand rather than with the unit itself.And if you want a unit that will be able to keep up with the increasing demand, you should look for one with a larger flow rate.If you are just using one faucet at a time and the problem still persists, check to be that the gas supply is not interrupted if the device is powered by gas.

See also:  How Much Is The Labor To Install A Hot Water Heater

Check to see that the venting pipes are not obstructed.Check to see that the gas valve is turned on rather than off.Maintaining the unit on a regular basis could be a good idea.

  • This prevents a slew of problems and allows the device to operate at peak performance for a longer period of time.

Inadequate Hot Water Supply

The amount of hot water available is insufficient for all of the household tasks.This problem comes if you acquire a smaller unit that is not capable of meeting your needs and requirements.If possible, get units that are sized appropriately for your family’s requirements so that you will always have sufficient of hot water available.Tankless water heaters just heat water when it is needed, so there is no need to be concerned.

Because there is no reserve in a tankless water heater, it will take longer for the water to heat up than it would in a conventional water heater.In the beginning, you may find this lengthy wait to be frustrating, but you will become accustomed to it with time.


If your water use is 35 gallons per day, you should get a device with a 45-gallon capacity.Even if the demand for water exceeds the available supply, measures should be taken to reduce use.Showers should be taken for shorter periods of time.Make use of lower-flow showerheads and attempt to spread out your water-consuming activities throughout the day to avoid overburdening your water heating unit.

If your water supply has suddenly decreased from its regular level, it is almost certain that your heating element has stopped working.

Too Hot Water Supply

The skin can be harmed by water temperatures that are too hot.It is possible to burn the skin if the water temperature is too high.This circumstance, which may be quite annoying for the user, is caused by a flaw in the thermostat.When the temperature is high, it indicates that the thermostat is set too high.

You may restore it to its original state on your own, without the need for assistance.It is possible that the thermostat sensors are the source of the problem.They’ve become a little sloppy.

If adjusting the thermostat and cleaning the shower head resolves the problem, it is likely that the thermostat was the source of the problem.If the problem persists, seek for sensors that may be causing it.


Your water heater’s electric power supply should be interrupted.Remove the cover from the heating elements.Look for the temperature setting on the thermostat on both sides of the thermostat.Check to see whether it falls within the typical range.

The optimum temperature range is between 110 and 125 degrees Fahrenheit.Adjust the temperature using a tool such as a flat-head screwdriver until it reaches the appropriate level.Set the other thermostat to the same temperature as the first.

The electrical power source should be connected once the insulation and plastic safety shield have been replaced.Wait for a short period of time, and the hot water supply will be available for use.

Why does my electric tankless water heater keep shutting off?

  • A water heater that keeps shutting off every now and again will undoubtedly be quite inconvenient. It is possible that the root cause of this problem is not straightforward. Here is a list of the most often encountered. Undoubtedly, a faulty cable is to blame for this problem. If you believe that there is a problem with the wiring connections, call a plumber immediately so that he can remedy the problem as soon as possible.
  • Check to see that your heater has an adequate amount of water, gas, and power.
  • Check your water heater filter to see if there is any dirt caught inside
  • Make certain that the water flow rate is appropriate. Unlike tank-style water heaters, tank-less water heaters are subject to a minimum water flow rate requirement, and if this need is not reached, the heater will not operate.

Water Leakage

It is possible that valves and connectors will leak.There might be a variety of reasons for this.Water leaking from the unit causes damage to the unit and creates a safety danger for the entire house.Water leaks can be caused by loose connections in some cases; if this is the case in your situation, tighten the connections to resolve the issue.

Other times, this occurs as a result of rusted pipes.It is mineral accumulation that is responsible for corrosion of the pipes.The mineral build-up corrodes the pipes and causes holes, which then allow water to flow out.

The corrosion-damaged pipe must be replaced as a result of this.Corrosion may be avoided by thoroughly cleaning the equipment on a regular basis.Installing a water softening unit if you have a hot water supply reduces the likelihood of harm to the device itself.


The pipes may corrode with time, resulting in water leaking out of the joints and onto the surrounding area.Double-check all of your connections to ensure they are secure and not leaking.If you believe they have gotten loose, use a wrench to tighten them back down again.As pipes cannot be fixed after they have rusted, it is necessary to replace them with new ones.

To accomplish this, first turn off the water supply valve and then replace the pipes..

Rusty Odor Water

It is important that the water flowing out of your pipes is clean and devoid of odors. However, if you see a little tinge, this indicates that your pipes are rusting. Water that smells bad indicates the presence of germs and, as a result, signals that the anode rod should be replaced as soon as it becomes necessary. This repair need the use of a specialist.

Noisy Water Heating

While it’s heating the water, does your water heater produce a strange, obnoxious noise?It is almost certainly caused by silt buildup in your tank.It is necessary to clear the sediment accumulation.Empty the tank first, and then thoroughly clean it.

Maintenance should be performed on your water heater on a monthly basis to prevent the buildup of minerals.If mineral build-ups are not cleared from your unit on time, they might inflict irreversible harm to it.It is possible that this damage will need the replacement of the damaged pieces.

Even if you have a guarantee, it will be of no value in this situation since it demonstrates your carelessness.

Coldwater Sandwich

When it comes to tankless water heaters, this is a rather typical and aggravating problem to deal with.That example, the water supply is initially hot when you turn on the faucet, but it quickly becomes cold, then hot, and then heated once again.The installation of a recirculating system is the most effective option in this situation.This will cause the water to be redirected back to the heater.

For example, replacing your water heater may be necessary because this problem happens more frequently with older water heaters.

Exhaust Problems

  • Water heaters without a tank are equipped with an LCD monitor that displays error codes whenever a problem occurs with the water heater. The code provides an explanation of the problem, as well as a proposed solution. An error code will be shown on the display panel if your exhaust is obstructed, and this will inform you of the situation. This indicates that there is an issue with the unit’s ventilation. To begin, inspect all of the pipes for any cracks or holes. Check to see that you have installed the item correctly and in accordance with the instructions. It is possible that if the water heater is placed too close to other units, it will obstruct the air supply and cause an explosion threat. Bird nests may be blocking vents outside the home, so ensure sure all of the vents are free and ready to be used before proceeding. Also see: What Size Tankless Water Heater to Replace a 50 Gallon Water Heater
  • Best Tankless Water Heaters for Large Families
  • and What Size Tankless Water Heater to Replace a 50 Gallon Water Heater.
  • Whether or whether I should turn off my tankless water heater if the water is shut off

Gas Tankless Water Heater Problems

Ignition Failure

Have you forgotten to turn on the water heater?This might be caused by a propane tank that is completely depleted.Check to see that there is adequate gas available for use.If the gas valve is not fully opened, the heating element will get a lower than necessary amount of natural gas.

Water will heat less effectively as a result of this.Open the valve all the way.If this does not resolve the issue, the situation is more serious and necessitates the engagement of expert assistance.

Flame Failure

Whenever either the gas supply or the electric power source is not functioning properly, this might occur.To begin, check to see if the propane tank is completely filled.It is possible that this problem will emerge if the gas pipe is too short or if there is a fault with the combustion or venting pipes.If you are unable to determine the source of the problem, seek assistance from a professional to guarantee that the equipment is fixed to its optimal condition.

Why does my gas tankless water heater keep shutting off?

If your gas tankless water heater continues shutting down, it might be due to a variety of factors, much as your electric tankless water heater.

Defective Gas Valve

If the gas valve is preventing the gas supply from reaching the water heater, the water heater will not ignite and the water will not heat. Alternatively, if the damage to the gas valve is irreparable, request that the plumber replace the old gas valve with a new one.

Mineral Built-Up

Tank-less water heaters must be cleaned on a regular basis in order to remove mineral deposits that have built up.Mineral deposits can build up on the heating element over time, eventually causing it to fail.Mineral deposits might cause the unit to shut down unexpectedly and without warning.Furthermore, these mineral deposits have the potential to entirely ruin the heating element.

The installation of a water softening device reduces the frequency with which the toilet needs to be flushed.In order to prevent your pricey unit from being harmed by hard water, try cleansing it at least once a year if you have hard water in your home.When properly maintained, a tankless water heating equipment may survive for an extremely long period of time.

According to certain research, a tankless water heater may provide reliable service for up to 20 years.In the case of an unflushed water heater, mineral buildup inside the unit will cause the pipes to leak, resulting in the need for a new unit to be purchased.

Improper Installation

  • It is possible that installing a tankless water heater on your own will be a difficult task. If you decide to do so, go through the handbook to obtain a general sense of where to position the various components. It is possible that a problem that occurred during the installation process would cause the device to corrode later on. One example is the employment of dielectric unions to join the pipes, which is a common practice. When joining two distinct types of pipes, dielectric unions are utilized to link them together. When utilized for the same pipes, dielectric unions cause the pipes to deteriorate as a result of the corrosion. Brass fittings are used to connect tankless water heaters to their respective plumbing systems. If the temperature of the water heater is set too low, the device may shut down as a result of the low temperature.
  • It’s possible that using a water-saving showerhead is the root of the problem.
  • Because of damage to the water flow sensor, the machine will not operate.
  • A suitable length for venting pipes should be used, with no sections that are too short.
  • Gas pressure must be maintained at a specific level in order for the heating system to work properly.

Low Water Flow Level

The lack of water pressure makes it difficult to do ordinary everyday tasks.If the water pressure from your tankless water heater is inadequate, just one faucet should be used at a time.Make certain that no more than one water-consuming application is being utilized at the same time.In order to ensure that the problem does not stem from your incoming water supply, check your water source.

Whenever the gas pressure is too low, the machine automatically adjusts the water pressure in order to maintain the desired temperature.The plumber should check to see that there are no problems with the water connections.Everything, including the fixtures and pipes, is in perfect working order.

Why does the Tankless Water Heater Shut off During Shower?

  • If you have an extremely old tankless water heater, it is almost certain that it has a low minimum flow rate. The amount of water that must flow through the pipe in order for the heating unit to heat the water is referred to as the flow rate. If your water demand is less than the unit’s lower flow unit, the unit will shut down as a safety measure as a result of the low demand. Providing the heat exchanger with an adequate supply of cold water can prevent it from overheating and being damaged. The unit shuts down in order to avert this massive loss. In order to resolve this issue, inquire with your technician about the possibility of upgrading your machine. The most recent unit has a lower flow rate that is more appropriate. The lowest water flow rate guarantees that the unit will continue to operate properly even if you just require a little amount of water. Tankless water heaters are frequently favored over traditional units due to the fact that they are more energy efficient and require less maintenance. They are not immune to challenges, just like the rest of the military. In this post, we’ll go through some of the most prevalent issues and how to solve them. Recent Posts by the Author

I’ve been working in the water heater and plumbing industries for several years. Providing relevant information regarding tankless water heaters is my goal, and I’m here to assist my readers in doing so. Adam’s most recent blog entries (see all)

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