How to replace thermostat on gas water heater
| This Honeywell gas thermostat is NOT removed from tank.instructions on separate pageHow to replace atmospheric Honeywell gas water heater thermostatThis Honeywell gas water heater thermostat can be removed from tankand steps shown on this page: | |
| This Honeywell gas thermostat is NOT removed from tank.instructions on separate page How to replace Honeywell gas water heater thermostatThis Honeywell gas water heater thermostat can be removed from tankand steps shown on this page: Range 90�, Hot is 120� F // Very Hot 156�, ECO limit 199� FResource .pdf:How to replace power vent water heater gas valve 1How to replace power vent gas control thermostat 2 Also read instructions below on this page_How to light water heater / pdfBradford White power vent service manual/ pdfError codes and service manualsBuyExample Honeywell gas control valve at Amazon | |
| Intellivent gas water heater thermostat IS removed from tank, and steps shown on this pageIntellivent gas water heater thermostat can be RESETResource:Read about resetting intelliventHow to light water heaterIntellivent error codes and service manuals Also read instructions below on this pageBuyBuy Intellivent gas control at AmazonWhite Rodgers/ Rheem Intellivent gas controlAO Smith intellivent | |
| Mechanical gas valves are removed from tank, and steps shown on this pageThermostat is located inside copper tube To replace thermostat, gas control valve must be replacedService manuals for all types gas control valvesBuyGas water heater thermostats at Amazon | |
| Thermostats are usually single-use after ECO trips Water heater Gas thermostat has Energy Cut OffWhen ECO senses overheating inside tank, the ECO trips and shuts off gas.If water heater burner or pilot has gas, then ECO is not tripped.Gas valve must be replaced (except Intellivent which can be reset). ECO must have continuityResource:Read moreTest ECO on Robertshaw- White RodgersRead about resetting intelliventBuyGas water heater thermostats at Amazon | |
| Replacement starts here for all models | |
| Before spending money on repairs, check anode rod Anode will stop tank from rusting. If anode rod is depleted, then install new anode to prevent steel tank from rusting. Anode is located on top of tank, either regular 1-1/16” hex head located on top of heater in separate anode port, or combo anode that is connected to hot water nipple. Or both is water heater has 2 anodes.Resources:Read more about replacing anode rodLeaking water heaterBuy:Anode rods at Amazon1-1/16″ impact socket at AmazonBreaker bar at AmazonAdapter from 3/8: socket to 1/2″ socket | |
| Identify and order new gas thermostat using label on side Order new gas control valve thermostat onlineIf gas control is discontinued, there are usually replacements available.Do not re-use old thermostatsDo not install different model on water heaterDo not mix propane or natural gasDo not convert water heater to different gas.Propane burns hotter and requires cast iron burner, and propane gas has more pressureabsolute danger to convert to different gasBuyGas water heater thermostats at Amazon | |
| Turning off the gas:Set the gas control valve/thermostat to its lowest setting. Turn gas control knob to “OFF” position. use shut off on gas line to turn off gas to water heater.Locate gas shut off. Handle will be parallel with gas line when gas is ON.Rotate gas shut off handle perpendicular across line to shut gas OFF. | |
| Turn off water and drain tank Let water heater cool for a couple hours. Release water pressure by opening a nearby hot water faucet, let run until water is cool to touch.Turn off water supply to the water heater. | |
| Remove gas line from side of gas controlKeep gas connections clean/ avoid debris inside gas valveGas line is re-used. Use only black pipe or flexible yellow gas line. Make sure gas line stays clean, so dirt will not enter new gas control. | |
| Keep pipe clean | |
| Larger imageConnections on bottom of gas control Note tubes connected on bottom of gas control. For propane, threads are reverse. Natural gas, threads are regular. Note how tight each is when removing, so re-installation is about same.The thermocouple or thermopile will be connected hand tight plus 1/4 turn. Overtightening when re-installing can cause failure. These connections do not need pipe sealant or teflon tape.Remove the ECO wires, Thermocouple, Manifold tube and Pilot tube | |
| Use 1/2″ galvanized pipe as handle Screw piece of galvanized pipe into gas control valve and use as handle to unscrew old gas control.Loosen gas control using weight of water inside tank, then drain tank before removing completely. | |
| Use weight of water in tank to loosen gas valve. then Drain tankTurn off water and drain tank completelyIf tank won’t drain, connect washing machine hose and water hose to drain valve to flush open. | |
| Install new thermostat New gas control should have sealant on threads. If not, add 6 wraps white teflon tape to threads.Install new gas control into tank. Must be tight so pressurized hot water doesn’t leak from tank. | |
| Larger image | Re-attach tubes under gas controlTo prevent cross threading, the manifold tube should be started by hand (turn clockwise for natural gas, counter-clockwise for L.P.) Do not overtighten. No teflon tape on tubes under gas control.Thermocouple is finger-tight plus �” Electronic gas controls have wires for thermopile and do not have thermocouple. |
| Re-attach gas lineUsing yellow teflon tape, or gas-approved thread sealant Yellow is for gas. Do not let pieces Teflon, or pipe sealant, into gas line where it can enter gas control.Do not overtighten gas line where it connects to gas control to avoid damage to new control.Gas has less pressure than water line. | |
| Larger imageGas pressure is low, so it takes time before leak will show. | Use soapy waterto check for leakson gas line, and on tubes under new gas control. Test for gas leaka) Test pipes: Mix liquid soap with water and use brush to put around around gas line joints to see if there are bubbles. Use plenty of soapy water. May take some time for bubbles to appear since gas is under low pressure.Soap bubbles coming from joint indicate leak: retighten pipes, use teflon tape on yellow flex pipe and black pipe.Do not overtighten pipes or damage can occur to gas control valve.b) Test factory-installed connections located below gas control valveManifold and pilot tube connections located under the gas control valve do NOT use teflon tape.See image of manifold and pilot tubes If either tube under gas control valve is leaking, just tighten a little bit. Do not overtighten.Manifold and pilot tube: look for reverse thread on LP water heater. Regular thread on NG water heaterRemember: Natural gas and propane gas both have less pressure on the line than water pipes, so gas pipes are easy to seal with ordinary wrench. If you can install water line without leaking, you can do the same with gas line. Do not over-tighten connections.Gas odor will be present if gas line has leak. Smell close to floor since some gas can be heavier than air and will settle downward. If gas is present, leave house immediately and call gas company. Turn off main shut-off at gas meter. |
| Bathtub running full stream before lighting water heater | Tank must be full of water before lighting 18) Fill tank completely with water until water is coming out of tub spout. Open tub spout on hot side and wait for full stream of water.Next open TP valve for a moment to bleed last of air from tank.Turn off tub spout and light heater. Tank cannot have any air when burner is turned on or damage can occur to tank. |
| How to light typical gas water heater Read directions printed on side of your tank | Light new water heater as shown on label located front of water heater Read product manual for tips and advisories.Resource:How to light gas water heater by type of gas control valve Note: New gas heater might have small water leak when first fired up because of condensationIgnore a bit of water inside combustion area or bottom of tank. This water is condensation and will disappear as tank reaches set temperature.Any cold tank can show same condensation when fired up.Water pipes should not be leaking.Water should not be dripping down vent pipe: this signals bad venting or other vent problem.Don’t worry excessively, but if needed, post questions on professional water heater forum:The Tank |
How To Replace A Water Heater Thermostat
Please keep in mind that this content may contain affiliate links. This means that, at no additional cost to you, we may gain a small profit on purchases made via our links. The replacement of a onethermostat is an ideal time to replace both the upper and lower thermostats at the same time.
Testing the Thermostats on a Dual Element Water Heater
Because the majority of electric water heaters employ both an upper and a bottom element, the procedure outlined below is intended for these models only. A multimeter and a screwdriver will be required for this test. You can get an excellent, affordable multimeter online or at your local hardware shop for less than $20. Putting the UPPER thermostat through its paces:
- Immediately turn off the water heater’s electricity. Remove the panels that provide access to the elements, as well as the insulation beneath them
- Set the upperthermostat to the highest level possible with a screwdriver. Lower the lowerthermostat to its most conservative setting
- Restart the water heater by turning the power back on. Check the two wires above the reset button to ensure that electricity is being sent to the water heater. The voltage should be shown as 240 volts. Check the power on the upper element terminal screws with your multimeter to ensure they are not faulty. If there is no power, the thermostat is defective and must be replaced. Ensure that the lower thermostat is operational if there is electricity.
Putting the LOWER thermostat through its paces:
- Set the top thermostat to the lowest setting possible. Make sure that the lower thermostat is set to its maximum setting. Check to see whether there is voltage on the bottom component. Assuming the multimeter indicates that there is power at the element, take a few minutes for the water to warm up.
- Turn down the thermostat’s temperature setting and listen for an audible click, which shows that the thermostat is operating properly.
- To determine whether there is power at the element if there is no voltage, check the lower thermostat.
- In order to test the top contact screw, place one of the multimeter probes there and another probe on the metal shell of the water tank. It should display a voltage measurement of about 120 volts. The top thermostat, which supplies voltage to the lower thermostat, will need to be replaced if there is no indication of operation. Place one probe on the lower contact screw of the water tank and the second probe on the metal casing of the water tank if a reading is obtained. It should display around 120 volts. If this is not the case, the lower thermostat will have to be changed.
Electric Water Heater Thermostat Replacement
In order to test the top contact screw, place one of the multimeter probes there and another probe on the metal tank case. This device should display a voltage measurement of around 120 volts. The top thermostat, which supplies voltage to the lower thermostat, will require replacement if there is no reading. Place one probe on the lower contact screw of the water tank and the second probe on the metal casing of the water tank if a reading is received. 120 volts should be displayed on the screen.
Step 2
In order to test the top contact screw, place one of the multimeter probes there and another probe on the metal case of the water tank. It should display a voltage measurement of around 120 volts; If there is no reading, the top thermostat, which supplies voltage to the lower thermostat, will need to be replaced. Place one probe on the lower contact screw and the other on the metal shell of the water tank to see whether there is a reading. It should read about 120 volts. The lower thermostat will need to be changed if this is the case.
Step 3
To purchase a replacement thermostat, bring the old thermostat(s) with you. Despite the fact that most thermostats are interchangeable, the greatest results are obtained by precisely matching the parts.
Step 4
If the bracket was broken during the removal of the thermostat, you can purchase a replacement bracket at the same time. When the old bracket is removed, the new one should be placed flat against the tank and dragged downward until it is securely in place.
Step 5
Each thermostat should be replaced by sliding it uniformly downward into the retaining bracket until it locks into position. Replace the wire in the exact same manner as it was removed. Replace the safety cover(s) and the access panel if they are damaged (s). Restore electricity to the water heater and allow it to run for one hour before checking the hot water pressure. If you believe that a heating element has failed as well, read How to Replace a Water Heater Element for more information.
Gas Water Heater Thermostat Replacement
Gas water heaters employ a different sort of thermostat system than electric water heaters. Generally speaking, on gas water heaters, the gas control valve, which incorporates both an adjustable thermostat and a heat limiting mechanism, is positioned on the outside of the unit, near the bottom. It may be distinguished from other components by the fact that it has temperature and pilot light controls.
The thermostat on a gas water heater will need to be replaced, and the gas control valve will need to be replaced as well. Do you need to change a water heater thermocouple or a water heater element? Refer to this page. Take a look at our articles on the subject!
How to Replace Your Water Heater Gas Control Valve
Please keep in mind that this content may contain affiliate links. This means that, at no additional cost to you, we may gain a small profit on purchases made via our links. A malfunctioning hot water heater thermostat, a faulty gas valve, a pilot light that won’t light, and a tripped heat limiter are all examples of water heater problems that can be caused by the gas control valve in the water heater. What you need to know about changing the gas control valve on your water heater is outlined below.
What Does A Water Heater Gas Control Valve Do?
In this case, the gas input is connected to the gas control valve, which regulates the flow of gas into the unit, as the name says, via the unit. The pilot is fired by the gas control valve, and the thermocouple is heated by the pilot that has been ignited. The water heater thermocouple heats the water in the tank and then transmits a signal to the gas control valve, which permits the burner to begin operating and heating up the water in it. There is another device projecting from the control valve that, in addition to the thermocouple and thermostat, detects when the water is too hot and turns off the valve to prevent the tank from reaching a critical heat limit and causing significant damage or injury.
Gas Control Valve Troubleshooting
Performing a troubleshooting procedure on the gas control valve will allow you to discover whether the valve is malfunctioning or whether a problem exists with the thermostat, heat limiter, pilot light, or even the gas burner. First, look for problems with the other components before concluding that the gas control valve is broken. Gas control valves do not fail on a regular basis, although they can malfunction in unusual circumstances. The thermocouple is more likely to be the source of the problem, and it is quite inexpensive to replace.
It is necessary to replace a heat limiter that has tripped due to excessive heat.
Despite the fact that the limiter may be replaced, the failure most likely implies a problem with the thermostat or gas control valve as well.
How To Replace A Gas Control Valve
Performing a troubleshooting procedure on the gas control valve will allow you to discover whether the valve is malfunctioning or whether an issue exists with the thermostat, heat limiter, pilot light, or even the gas burner itself. Check the other components first before concluding that the gas control valve is defective. It is not common for gas control valves to fail, although it does happen on occasion. The thermocouple is more likely to be the source of the problem, and it is quite inexpensive to replace it.
It is necessary to replace a heat limiter if one has been tripped.
However, it is possible that changing the heat limiter will not resolve the initial issue. However, even if the limiter may be changed, it is likely that the thermostat or gas control valve has failed as well, making the situation worse.
- Instructions on how to replace a water heater pressure relief valve
- How to replace a water heater drain valve
How to Replace a Water Heater Thermostat
Depending on why your water heater has stopped operating, it may have failed to obtain a temperature measurement. If this is the case, do you know how to change the water heater thermostat? If this is the case, you’ve come to the correct spot. Before purchasing a new replacement component, you should ensure that your old thermostats have been thoroughly tested. The replacement of thermostats is a waste of time and money if the thermostats are not the source of the problem. These are the operating instructions for electric water heaters.
How to Test a Water Heater Thermostat
Most electric water heaters have two thermostats, and it is possible that one or both of them are malfunctioning. Keep in mind that the upper thermostat is responsible for supplying voltage to the lower thermostat. Here’s how to figure out what has to be replaced:
- Turn off the electricity to the water heater
- Remove the access panels and insulation to gain access to the thermostats and heating/cooling elements. By rotating the dial in the middle of the higher thermostat to high and the lower thermostat to low using a screwdriver, you may set the top thermostat to high and the lower thermostat to low. For greater temperatures, turn the knob clockwise
- For lower temperatures, turn the knob counterclockwise
- Restore power to the system
- Check the wires above the reset button on the thermostat with a multimeter (we recommend theUEI UTL33T digital multimeter) to ensure that they are reading 240v. Inspect the higher element for power by checking the terminal screws on the upper element. If there is no electricity, it is necessary to replace this thermostat. If you do discover that there is electricity, then check the lower thermostat setting. Set the lower thermostat to high while keeping the upper thermostat at low temperature. As before, check certain that there is voltage, this time to the bottom element.
- If there is electricity and the water begins to heat up, the lower thermostat is most likely in excellent working order. When you lower the temperature of your water heater, you should hear a clicking sound. That’s the sound of your thermostat turning on. If there is no voltage, then check the lower thermostat by putting one probe of the multimeter to the top contact screw and the other probe to the metal of the tank. If there is no voltage, then check the upper thermostat. Unless you receive a reading, you will need to have the higher thermostat repaired or replaced. If you obtain 120 volts, you know that the higher thermostat is working properly. Remove the probe from the top contact screw and touch it to the bottom contact screw while still contacting the tank with the other probe. Repeat this process with the other probe. If you only receive 120v, that’s ok. If you receive nothing, it is necessary to replace it.
Replacing a Water Heater Thermostat in 8 Steps
Keep in mind that this is for electric water heaters only:
- First and foremost, turn off the electricity at the breaker
- Remove the access panel(s) and insulation so that you may gain access to the thermostat and adjust it (s). You may have one or two access panels on your property. The majority of water heaters contain two heating elements/thermostats. Make use of the voltage meter to ensure that the power is entirely turned off. Photocopy the wiring within each panel so that you can refer to it later when you’re putting everything back together again. Remove the thermostat’s wire from the wall
- To remove the thermostat, you must first remove the complete bracket that keeps it in place. Pry out each side one at a time with a twisting motion, being careful not to damage the skin. Don’t try to force it, or you’ll end up breaking it. It’s important that you don’t have to replace that part as well, so take your time with this step and do it correctly. Replace the wire after inserting the new thermostat into the bracket and securing the bracket in place. Reconnect the electricity and let your tank a few minutes to warm up before using it.
Enjoy Your Newly Working Water Heater
This job is doable by even the most inexperienced home repair beginner, but that doesn’t mean you should. If this appears to be too much for you, get professional assistance. If you found this post useful, please spread the word about it among your social media contacts. Bradford White and other well-known brands are available at PlumbersStock. If you are looking for a new water heater, you have come to the correct spot. If you require further information on water heaters, please refer to our assistance resources or thisWiki page on the subject.
Gas Water Heater Thermostat
Is it possible for you to service a gas water heater thermostat? It is normally installed as part of the gas valve and is not accessible for maintenance. The thermostat is mostly used to regulate the temperature of the water in the tank, which is why it is so popular. It will be necessary to replace the complete gas valve if the thermostat becomes faulty. For more information on this subject, see the article’Troubleshooting Water Heater Gas Valves ‘. Not sure what the source of your problem is?
There are three major items to consider when it comes to the thermostat.
Second, before you point the finger at your water heater, make sure you know the’Gas Water Heater Tank Size ‘.
It is possible to replace it.
Hot Water Temperature
The most difficult part of using the thermostat is getting it to the proper temperature. Seek to understand what the problems are, as well as what you can do to resolve them When you have children or older people living in your house, it is critical not to set the water temperature too high. Wait, I generally mix hot and cold water together, and the hotter the water, the more showers and baths we may have at the same time. This is correct, however there is a risk involved. In less than a second, hot water from your tank’s maximum setting may scald you and inflict severe burns to your skin and clothing.
When it comes to setting the temperature, what is the optimal setting? What alternative options are there for increasing the amount of hot water without increasing the temperature? This article will assist you in finding the answers to all of your queries.
Using Common Sense Header
The most difficult part of using the thermostat is getting it to the proper setting. Find out what the problems are and what you can do to solve them. When you have children or older people living in your house, it is critical not to make the water temperature too hot. Please wait, I generally mix hot and cold water together, and the hotter the water, the more showers and baths we may have. Certainly, but there is a risk involved. In less than a second, hot water from your tank on its maximum setting may scorch you and inflict severe burns.
When it comes to setting the temperature, what is the greatest choice?
This article will assist you in finding the answers to all of your queries and concerns.
Troubleshooting Gas Water Heater Thermostats
Obviously, utilizing the thermostat on your gas hot water heater is a good idea in this situation as well. If you want to raise the temperature of your water heater above 120 degrees, proceed with caution. It is possible to get burned or scalded. For information on the correct temperature setting for a hot water tank, go to the page on “Gas Water Heater Temperature Settings.” In addition, the essay highlights the dangers of increasing the temperature to an excessive level.
Not Enough Hot Water
Is there a difference now? Do you have a higher number of persons that use hot water? You may need to consider a larger hot water heater if this is the case and you do not have enough hot water available. The most common complaint about a hot water tank is that there isn’t enough hot water. It’s possible that the hot water heater is not to blame. The article’Gas Water Heater Tank Size’discussed the appropriate size of your tank in relation to your household’s water heating requirements.
Thermostat on Gas Valve Is Not Working
The thermostat for the water heater is integrated into the gas valve. They are not replaceable on their own; they must be changed with the valve. If you believe you may be experiencing a problem with your gas valve, refer to the article’Troubleshooting Gas Valve Problems’for additional information.
Summary
When it comes to your gas water heater thermostat, the temperature setting is the most important factor to consider. You don’t want anyone in your house to be burnt to death. Check to be that the thermostat on your gas water heater is adjusted to the appropriate temperature. It is necessary to change the gas valve in order to replace the thermostat. We provided you with a URL where you may discover detailed instructions. There is no other option; it is delivered as a single item. Were you able to locate what you were looking for?
It’s time to move on to the next home improvement job.
5 Easy Steps For a DIY Water Heater Thermostat Repair
Hot water is a luxury that most of us can’t imagine not having at our disposal. Consider all of the numerous ways you use hot water in your daily life – for dishes, for clothing, for bathing, for mopping, and so forth. Having a malfunctioning water heater in your home will give you a sense of how critical and vital your water heater is to your daily routine and way of life. Water heaters are available in a variety of configurations, including electric, propane, and natural gas. Each operates in a slightly different way, but they both provide the same purposes, which include heating water and storing it until it is needed again.
When the thermostat in your water heater malfunctions, you will be unable to monitor or control the temperature of your hot water. It is critical to keep the thermostat in good working order in order to prevent your water from exceeding boiling levels.
When Should You Repair Your Water Heater Thermostat?
When it comes to your water heater, there are a few tell-tale indicators that you should be aware of and pay attention to. Some of the indicators listed below may indicate that your water heater needs to be serviced or repaired.
Your Water is Too Hot
The presence of very hot water is a strong sign that your thermostat is set too high. Other external variables, such as the changing of the seasons, may also contribute to this problem, and you should adjust the suggested setting when the weather changes from cold to warm. If you are unable to reduce the temperature of your water, you may need to replace the entire thermostat or do a thorough inspection for any wiring problems. Find a professional to assist you in resolving thermostat wiring difficulties in order to avoid injury or more harm.
There’s Not Enough Hot Water
The presence of very hot water is a strong sign that your thermostat is set too low. This problem may be exacerbated by external variables such as the changing of the seasons, therefore you should adjust the suggested setting when the weather changes from cold to hot. You may need to replace the entire thermostat or check for wiring faults if you are unable to reduce the temperature of your water. Consult with a professional to assist you in resolving your thermostat wiring concerns in order to avoid injury or further harm.
Water Takes Too Long to Reheat
Electric water heaters are notorious for taking a long time to heat up. Heater reheating time is approximately twice as long as it takes for a gas heater to heat up. If you notice that it is taking even longer to heat, it is possible that there is an issue with the heating components or thermostat.
A Step-by-Step Guide to Repair a Water Heater Thermostat
A water heater’s thermostat is responsible for regulating the temperature of the water. It is possible that if the temperature is adjusted too low, the water will cool before it is sent to the faucet. Furthermore, if the temperature is set too high, you run the danger of being burned or scalded by the water temperature that is emitted from the faucet. In the event that you do not have hot water, here is how to fix a thermostat:
- Figure out where the upper and lower thermostats are
- The power supply of both thermostats should be checked. To establish whether the thermostat will or will not function, press the button to reset it one more. If there is no power to the upper system, the thermostat should be replaced. The top heating element should be replaced if your upper system is getting electricity but there is no hot water coming out of it.
The upper and lower thermostats should be identified. Check the power supply of both thermostats. To determine whether the thermostat will or will not function, press the button to reset it. If there is no power to the upper system, the thermostat must be replaced. It’s time to replace the upper heating element if your upper system is getting electricity but there is no hot water;
1. Locate Your Water Heater’s Temperature Control Knob.
When the temperature control knob is turned, it is connected to the heater’s heat source, which is normally red and positioned on the front, lower center area of the heater’s body.
2. Look for the Small Black Line or Arrow above the Knob.
A temperature setting may be labeled “warm” or “hot” in this area, depending on the current temperature setting. This can alternatively be shown by a black line (120 degrees Fahrenheit) or a white line (140 degrees Fahrenheit) (105-110 degrees Fahrenheit).
3. Adjust the Temperature Somewhere Between 105 and 120 DegreesFahrenheit.
What factors should you consider before deciding whether to repair or replace your water heater? In most cases, if there isn’t a leak, the damage is minimal and can usually be fixed quickly and simply. For example, tank wear and rust are two of the most prevalent types of problems you’ll observe with your water heating system. These are often minor concerns that may be resolved with minimal effort. If your tank is leaking, it is preferable for you to replace it rather than attempt to fix it.
Additionally, leaking tanks can result in hazardous water damage to your personal belongings, and if the water isn’t cleaned up immediately, mold-breeding fungus can form. Here are some more reasons that may contribute to water heater problems:
- The drain valve
- The cold water inlet
- And the hot water inlet. In addition to the anode rod, the dip tube and the pressure release valve are also included.
You should call a local specialist if you are experiencing problems with your water heater in the Sacramento region to decide whether it needs to be replaced or repaired.
Test & Replace a Water Heater Thermostat: DIY Guide
We shall almost certainly all be confronted with the situation of a water heater that is not producing any hot water at some point in our lives. We have two options: either contact a qualified plumber or do it ourselves. Fortunately, most water heaters can be repaired reasonably quickly and inexpensively. There are two primary reasons for a water heater not working: If you’ve never checked or changed a water heater thermostat before, it might seem like a difficult process at first glance. It’s not too difficult.
When bathing or cleaning, no one enjoys using cold water.
In this post, we will look at how to diagnose your electric water heaterthermostat and how to replace it if it becomes damaged or malfunctioning.
How Electric Water Heater Thermostats Work
When you begin to realize that your water heater isn’t operating as efficiently as it should, the thermostat is more than likely the source of the problem, or at the very least a contributing factor. No need to repair the entire electric heater when you can save yourself both time and money by just replacing the thermostat instead. Once you’ve gone over the following instructions, it will only take a few minutes. Electric water heater thermostats function by opening and shutting connections, which allow electricity to pass to the heating components of the water heater.
- Modern home water heaters are equipped with two heating components as well as two thermostats.
- The higher thermostat differs from the lower thermostat in several ways.
- It is quite rare for both thermostats to fail at the same time (although I do recommend replacing both when one fails).
- Whenever a lower heating element or thermostat fails, the top thermostat and heating element will take over and continue to heat water in the upper part of the hot water storage tank.
Are Electric Water Heater Thermostats Universal?
No, not all water heater thermostats are designed to be interchangeable. It is important to note that there are certain differences in thermostats between single-element and dual-element water heaters. Additionally, with dual-element water heaters, there is a differential between the top and bottom thermostats. In order to properly select a water heater thermostat, you must first determine the number of elements and the voltage of the water heater in question. It is possible to obtain this information from the data tag located on the side of the water heater.
The voltage is inscribed on the end of the heating element, and it may be read with a magnifying glass.
There are more than 50 different household tank-style electric water heaters available on the market, and the thermostats on the majority of them are designed to be interchangeable. When making a purchase, it is important to thoroughly read the product description.
Dual-ElementThermostats
Typical household water heater thermostats are seen in this photo, which includes an upper and lower thermostat for each. Because it is located above the lower thermostat, the thermostat on the left has a high limit switch, which can be identified by the red reset button. The upper thermostat is in charge of controlling both the upper element and the lower thermostat, respectively. When you look at it from this angle, you can see the bottom thermostat, which regulates the lower element. For a replacement kit that includes two heating elements, upper and lower thermostats, and seals, we offer theRheem SP20060 Electric Water Heater Tune-Up Kit, which can be purchased on Amazon.com for about $30.
A universal upperthermostat produced by Rheem is what we’re looking at here.
It is a Rheem lower thermostat that is universal in use.
Single-Element Thermostats
The thermostat seen here is for a water heater with a single heating element. The thermostat is very similar to an upper dual-element thermostat, with the only variation being the amount of wire terminals on the thermostat. In this case, the single element thermostat has just two terminals on the right side and four on the left side, as you can see in the illustration. If you require a single-element thermostat, the Camco 07843 Single Element Water Heater Thermostat with HLC is a good option to consider purchasing.
The following is a list of the supplies you’ll require:
- In addition, you’ll need a 1/4-inch nut driver or a flathead screwdriver, two Phillips screwdrivers, an analog or digital multimeter/voltmeter, and a new thermostat.
How to Test a Water Heater Thermostat for Continuity – Step-By-Step
We must examine the thermostats for continuity in order to identify whether or not the thermostat has failed. You’ll need an analog or digital multimeter for this, which you can get here. WARNING: Working with electricity is extremely hazardous and can result in death. Before dealing with wiring or electrical connections, be certain that the power is turned off. Follow these procedures to determine which thermostat is malfunctioning.
Step 1: Turn the power off
Checking the thermostats for continuity can help us identify whether or not a particular thermostat is malfunctioning. An analog or digital multimeter will be required for this task. Caution: Working with electricity is extremely dangerous and can result in death if not done correctly. Before working with wiring or electrical connections, be certain that the power is turned off in the area. Follow these methods to determine which thermostat is malfunctioning and which is working properly.
Step 2: Remove the outside access covers
To remove the access cover from the upper and lower thermostats, use a 1/4-inch nut driver or flathead screwdriver to pry them off.
Fold the insulation back over the thermostat to prevent it from being damaged. To keep the insulation out of the way, use tape to hold it in place. Remove the plastic cover that covers the thermostat on the inside of the house.
Step 3: Confirm power is off to the water heater
Make sure the water heater is not receiving electricity before working on it with a multimeter before doing anything on the thermostat. If you have a voltage stick, you may also use it to measure the voltage. Connect the top and legs of the multimeter at the same time, using the multimeter connectors. The meter should be set to zero. Touch each leg of the water heater while the black connector is in contact with it to ensure there is no electricity.
Step 4: Check the high limit reset button
If the manual reset switch, also known as the high limit reset button, has been tripped, it should be replaced. This button will trip on occasion if any of the following conditions are met:
- There is a short circuit between the thermostat contacts
- The thermostat is out of tune
- The heating element has failed
Step 5: Disconnect the wiring
Take a photo with your phone or a digital camera to use as a reference if it becomes necessary to identify which cables are connected to which terminal in the future. To detach the wiring from the thermostat terminals, unscrew the terminal screws using a Phillips #2 screwdriver and pull the wiring away from the terminals.
Step 6: Check the thermostat with a multimeter
Set the resistance of the multimeter to the lowest ohms possible (typically x10). Using your fingers, squeeze the probes together and adjust the needle to zero to calibrate your meter. To check the resistance of a digital multimeter, set it to the lowest possible value of resistance (usually 200), or, if your multimeter has an option for resistance with tone, choose it. Take one of the black probes from your multimeter and insert it into the screw terminal on the left side of the instrument. Take the red probe and connect it to the other left-side terminal on the other side.
- This means that the thermostat is not functioning properly and must be replaced.
- For a demonstration, please see the video above.
- As soon as you have finished testing your water heater thermostat, you may either reconnect the wire and close the access cover, or you can proceed to the next step, which is replacing the thermostat.
- How to Test and Replace a Faulty Water Heating Element is a step-by-step guide that explains how to accomplish this in further detail.
How to Replace a Faulty Water Heater Thermostat – Step-By-Step
Once you’ve discovered which thermostat is faulty, it’s time to begin the process of removing and replacing it. Insider’s Tip: As previously said, it is typically a good idea to change both thermostats and heating components on a yearly or biannual basis. The reason for this is that if one of the heating components is beginning to fail, it has the potential to short out the replacement thermostat shortly after it has been placed, causing it to fail.
Some of the stages will be repeated in this section. Following the testing methods provided above, you should be able to skip to Step 5. For those who have not yet tested their thermostats, we will first go through the preparatory processes. We’re going to start from the beginning.
Step 1: Turn the power off
Make your way to the circuit breaker box and look for the switch labeled ‘Water Heater’ or anything along those lines. It should be turned off, making sure to turn off both switches if it is a 220v switch. If you’re not sure which water heater is causing the problem because of outdated stickers or labels, get a professional to turn them off for you.
Step 2: Remove the outside access covers
Remove the cover panel that corresponds to the thermostat that has to be replaced and set the cover panel aside. The coverings for water heater tanks are often located on the side of the tank. Ensure that you do not loose any of the little screws by using the 1/4-inch nut driver or a flathead screwdriver for this section. Remove the insulation from the thermostat as well as the plastic protective cover that covers it.
Step 3: Confirm power is off to the water heater
Each wire should be tested with your multimeter/voltmeter. This may be accomplished by grounding one of the lines and checking each terminal one at a time until the problem is resolved. Even if you have shut off the power at the circuit breaker, you should always double-check your work using one of these meters to ensure that you have not electrocuted yourself. Connect the top and legs of the multimeter at the same time, using the multimeter connectors. The meter should read 0 at this point. Touch each leg of the water heater while the black connector is in contact with it to ensure there is no electricity.
Step 4: Disconnect the wiring
Take a photo with your phone or a digital camera to use as a reference if it becomes necessary to identify which cables are connected to which terminal in the future. Disconnect the wiring from each terminal on the thermostat with a Phillips screwdriver #2. Remove the thermostat from the wall.
Step 5: Remove the defective thermostat
Gently remove the old thermostat by pulling outward on the clips and raising the thermostat up and out of the retaining bracket with your finger or a flathead screwdriver. Caution should be exercised to avoid breaking the retainer bracket. It is possible that breaking this retaining clip will result in the need to replace your water heater.
Step 6: Insert the new thermostat
Inserting the new thermostat into the retaining bracket that holds the old thermostat in place will allow you to precisely position the new thermostat. Reconnect the wires to the relevant terminals by twisting them together. If necessary, you can refer to the photograph you took previously for guidance. Check to see that each wire is securely linked to the next. Check to see that the thermostat is securely attached to the water heater, otherwise the thermostat may not operate correctly. After that, adjust the thermostat to the temperature you like for the water.
These modifications may be accomplished with the use of a flathead screwdriver.
The following is an insider’s tip: If you intend to replace your heating element with your new thermostat, you will need to empty the water heater first.
Some people propose doing a quick change without draining the storage tank; however, I do not encourage this because any mistakes might cause harm to the interior of your house. Check out our post on how to empty your water heater, as well as additional water heater care advice.
Step 7: Reattach the cover panels
Now that you’ve completed the replacement, it’s time to seal everything up and double-check your work for mistakes. Remove the plastic protective cover and insulation and replace them with new ones. Reattach the outside access panels if they have been removed.
Step 8: Turn the power back on
Following the completion of the installation, return to the electrical box and re-energize the circuit breaker (if necessary). Hot water recovery will take around one hour to complete, but you should be able to use hot water within 15 minutes after turning on the faucet. Over the next several days, make sure to check on the water heater on a regular basis.
Water Heater Thermostat FAQs
Electric water heater thermostats are typically pre-set by the manufacturer to 110 or 120 degrees Fahrenheit, depending on the model. You have the option of increasing the temperature to the maximum setting, which is typically 150 degrees Fahrenheit, if necessary (65 degrees Celsius). The maximum water temperature setting should be no greater than 120 degrees Fahrenheit (48 degrees Celsius), since a higher setting might provide a scorching threat to small children and the elderly.
Should water heater thermostats be set to the same temperature?
Most electric water heater thermostats are factory configured at 110 or 120 degrees Fahrenheit, depending on the manufacturer. You have the option of increasing the temperature to the maximum setting, which is typically 150 degrees Fahrenheit, if desired (65 degrees Celsius). The maximum water temperature setting should be no greater than 120 degrees Fahrenheit (48 degrees Celsius), since a higher temperature might provide a scalding threat to small children and the elderly.
What would cause a water heater thermostat to burn up?
A malfunctioning heating element, a power surge, or just the passage of time can cause a water heater thermostat to burn up. When internal components of water heater thermostats wear out, they become faulty and fail. Even with regular electric currents, an older thermostat may experience failure. If the manual reset switch on your water heater thermostat does not work, the thermostat will need to be repaired or replaced. Replacement of both thermostats and heating elements should be done at the same time because if one of the heating elements is beginning to fail, it may cause the new thermostat to short out shortly after it is installed, which is not recommended.
Final Thoughts
When there is a problem with the heating element or when there is a power surge, the thermostat on a water heater might catch fire and burn up. Because of the wear and tear on the internal components of water heater thermostats, they might malfunction and fail. Even with typical electric currents, an older thermostat can fail. If the manual reset switch on your water heater thermostat does not work, the thermostat will need to be changed. Replacement of both thermostats and heating elements should be done at the same time because if one of the heating elements is beginning to fail, it might cause the new thermostat to short out shortly after it is installed, which is not recommended.
Easy Steps for a Hot Water Heater Thermostat Replacement
The thermostat in your home may have stopped functioning properly, and before you replace it, you should ensure that the gadget has been tested thoroughly. Why? Both an upper and lower element are used in a significant proportion of the water heaters now on the market.
It is critical that you identify the specific component that is not functioning properly. A multimeter and a screwdriver will be required in order to test your thermostat. Take the actions outlined below:
Testing your water heater’s upper thermostat:
- Your water heater’s electricity should be turned off. Locate and gently remove the access panels from the wall. Remove the insulation from beneath the floor as well. It is now necessary to adjust the top thermostat to the highest level it will allow. This may be accomplished with a regular screwdriver. It is now necessary to adjust the lower thermostat to the lowest level that is possible. Restart your water heater by turning the power back on. The two wires that are located above the reset button should be identified and tested using a multimeter. 240 volts should be displayed on your multimeter. Locate and test the top element terminal screws using the multimeter, as well as the lower element terminal screws. You will know if your water heater’s thermostat is malfunctioning because you will not be able to turn on the water heater.
Testing your water heater’s lower thermostat:
- While maintaining complete power failure, adjust the top thermostat to its lowest possible setting and the lower thermostat to its highest possible setting
- Whether there is electricity coming from the bottom element, check with the multimeter to verify if it is there. If there is voltage, wait for the water to become heated before proceeding further. This may just take a few minutes
- However, You would like to lower the temperature on the thermostat at this point. It is possible to hear an audible click if the thermostat is running properly
- Nevertheless, if the multimeter indicates that there is no voltage flowing from the element, you should check the lower thermostat for power. Take one of the probes from the multimeter and place it against the top contact screw to complete the test. Take the other probe and gently press it against the metal shell of the water tank to test it. In order for your multimeter to be in proper operating order, it should read no more than 120 volts.
Replacing your thermostat:
- Turn off the electricity
- Remove the water heater’s access panel and safety cover
- Next, remove the tank. Carefully pry away the bracket that is keeping the thermostat in its position. Removing the old thermostat and replacing it with a new one is necessary. Replace the brackets and make certain that the wiring is rejoined in the same manner as it was previously detached. Reinstall the access panel and safety cover, and then turn on the electricity.
You should keep in mind that while you’re changing a gas water heater thermostat, the gas control valve, the thermostat, and the heat-limiter all have to be installed on the exterior of the tank. When he was 14 years old, he began his plumbing profession while still a student in high school. Kevin Sharp graduated with honors from Illinois State University with a bachelor’s degree in journalism. Kevin L. Sharp’s most recent blog entries (See all of them)
Water heater thermostat replacement cost
My AO Smith (GNR 50 200) gas-powered water heater, which had been in service for four years, had ceased operating. The status light went out, and I attempted to re-light it, which was successful; however, the status light is now blinking four times, indicating that the water temperature is too high, which is clearly not true. After a couple of hours of waiting, I attempted it twice more before calling the local service provider for assistance. In his opinion, the gas valve thermostat is most likely faulty, and the repair would cost upwards of $900 in total, including materials and labor.
He also stated that the most typical problem is that the thermostat has ceased operating, particularly with white thermostats.
He supplied an estimate of $2700 for the installation.
Because my heater is still under warranty, I need to contact AO Smith in order to obtain a new part, but their office is closed and I expect it to take several days to receive the replacement component.
Is it acceptable to charge $600 for labor to install the thermostat?
How to Replace a Rheem Hot Water Tank Thermostat
A wide range of hot water heaters are manufactured by Home-Diy, with the gas and electric types being the most commonly encountered varieties. Despite the fact that these water heaters operate in a straightforward manner, they do have elements that might malfunction from time to time. The thermostat is the most often failed component on the gas model. On the electrical model, either the thermostat or the heating components will stop working properly. Whatever type water heater you have, the thermostat can be replaced by the ordinary do-it-yourselfer in a very short amount of time.
- A wide range of hot water heaters are manufactured by Home-Diy, the most popular of which are the gas and electric types. They have parts that break from time to time, despite the fact that these water heaters are rather straightforward in their operation. The thermostat is the most often encountered malfunction on the gas-powered version of this vehicle. The thermostat or the heating components will malfunction on the electrical model. Whatever type water heater you have, the thermostat can be replaced by the typical do-it-yourselfer in a very short period of time.
Warning
Gas and electric hot water heaters are the most prevalent types of hot water heaters manufactured by Home-DiyRheem. Despite the fact that tankless water heaters are quite straightforward in their operation, they do contain parts that can fail from time to time. The thermostat is the most often encountered problem on the gas type. The thermostat or the heating components will fail on the electrical model. Whatever type water heater you have, the thermostat can be replaced by the ordinary do-it-yourselfer in a matter of minutes.
Gas Water Heaters
- The gas feed to the water heater should be turned off. Turn off the water supply to the water tank by turning the valve in the line right above the water tank, as shown in the illustration. Open the water tank relief valve, which is located on the heater’s top. Connect a garden hose to the drain valve and drain the water from the hot water tank
- Using a pipe wrench, disconnect the gas line and thermocouple from the front of the water heater at the thermostat, allowing the water heater to cool down. To remove the thermostat from the water tank, use a pipe wrench to crank it counterclockwise until it is no longer attached. Tighten the new thermostat with a pipe wrench after wrapping Teflon tape around the threads. Make sure the new thermostat is aligned with the burner fittings before turning it on and off. Pipe wrenches can be used to tighten the connections between the gas line and the thermocouple on the new thermostat. Disconnect the water heater’s relief valve at the top and drain valve at the bottom, and then unhook the hose from the water heater’s relief valve. Turn on the water inlet valve located at the top of the water heater to allow the tank to fill up with hot water. Make sure to open the hot water faucet at the kitchen sink or bathtub to enable any trapped air to escape. After the water has been flowing continuously for a few minutes, turn off the faucet and open the gas connection to the water heater. The thermostat should be set to the lighting setting. Press the button and ignite the pilot light with a match to complete the process. Allowing gas to accumulate is not recommended. Immediately after activating the pilot light button, the pilot will be illuminated.
Electric Water Heaters
- The water heater’s gas supply should be turned off. Turn the valve in the line right above the water tank to turn off the water supply to the water tank. Open the water tank relief valve, which is located on the heater’s top panel. Connect a garden hose to the drain valve and drain the water from the hot water tank
- Using a pipe wrench, disconnect the gas line and thermocouple from the front of the water heater at the thermostat, allowing the water heater to cool down completely. Using a pipe wrench, spin the thermostat counterclockwise to remove it from the water tank. Wrap Teflon tape around the threads of the new thermostat
- Install the new thermostat on the water heater and tighten it down with the pipe wrench, ensuring sure that it is aligned with the burner fittings
- Using a pipe wrench, attach the gas line and thermocouple to the new thermostat and tighten them. Disconnect the water heater’s relief valve at the top and drain valve at the bottom, and then unhook the hose from the water heater’s drain valve. To enable the tank to fill, open the water inlet valve located at the top of the water heater. The air can be released by opening the hot water tap at the kitchen sink or in the bathtub. Close and open the gas line to the water heater once the water has been running uninterrupted for a few moments. Turn on the lights by setting the thermostat to the lighting setting. Using a match, strike the button to turn on the pilot light. There should be no buildup of gas. After activating the pilot light button, the pilot should be lit instantly.
The Drip Cap
- Gas and electric hot water heaters are the most frequent versions manufactured by Rheem, but the company also makes other types of hot water heaters. Immediately turn off the gas feed to the water heater
- Using a pipe wrench, disconnect the gas line and thermocouple from the front of the water heater, near the thermostat, and set aside. Allowing gas to accumulate is not recommended. Removing the insulating covering from the thermostat’s face is necessary. Install the cover on the thermostat and use the screwdriver to tighten the retaining screw