How To Check Water Heater Thermostat

7 Steps to Test Water Heater Thermostat

Inform everyone in your home of the following: Notify everyone in your household that they should refrain from turning on the hot water faucet until you direct them differently; Turn off the thermostat: Locate the thermostat for your hot water heater and turn it to the “off” position. For enhanced safety, electric water heaters should be turned off at the circuit breaker. Remove your foot off the gas: Gas-powered water heaters must also have the gas line going to the thermostat turned off. Cut off the water supply: Lastly, shut off the cold water supply by turning off the valve like you would any other water valve in your home.

Because you turned off the gas and the thermostat, the water should not become hot.

If the weather doesn’t become much hotter, then everything is going smoothly.

Open the pressure release valve on your water heater by placing a bucket underneath it and turning it on.

  • Wait around 15 minutes after this valve has stopped draining to allow any residual water in the tank to cool.
  • Placing the other end of the hose in a bucket or even out on the lawn will let you to conduct some DIY gray-cycling.
  • Get water heater repair in Cerritos, California.
  • Even if the water begins to flow clean, it is recommended that you wait until the remainder of the water has fully drained from the hose.
  • Remove any leftover sediment by rinsing with water: Finally, but certainly not least, turn on the water tap from step 3 and allow it to run into your hot water tank and out the hose.
  • You did an excellent job!
  • Replace the water heater’s pressure relief valve, turn off the drainage spigot, remove the garden hose, turn off the tap that you turned on in step 5, and then turn on the water tap that you turned on in step 3 one more time.
  • When the tank is filled, open the pressure release valve for a brief period of time before shutting it again.

Repeat the process at a hot water faucet in your house to release any residual extra air from the system. You must now re-start the thermostat and the gas, which may need re-igniting the pilot light. If you turn off the power, don’t forget to turn on the circuit breaker as well.

How Does A Thermostat Work?

In most cases, an electric water heater has three primary characteristics. It is equipped with an electric heat source as well as a temperature control system and a switch to protect the device from excessive heat. A thermostat may be used to create hot water that can be used for a variety of applications. Consider that the degree of heat necessary for washing may differ from the level of heat required for bathing, for example: Furthermore, it regulates the amount of electricity that flows to another thermostat or heating element, among other things.

  • The primary thermostat is located on the top of the unit, which also has a high limit switch.
  • Both thermostats (which are installed on the same water heater) do not have the same set of capabilities.
  • On the same wall as the top thermostat, you will find the high limit switch.
  • This button can be used to reset the system to its default settings.
  • Alternatively, you may set the upper element to a lower temperature, letting the bottom element to operate first, so saving energy.
  • They do, however, have a high limit switch, similar to the bigger water heaters.

How to Test Water Heater Thermostat

It is also necessary to test the heating element on an electric water heater if you wish to put a thermostat in it. This is critical, especially given the fact that open and grounded heating components result in erroneous testing outcomes. You will need to use a screwdriver to inspect the vehicle for problems. As part of the water heater inspection, digital multimeter equipment will be used to assess the temperature of the water heater. Let’s get started with the procedures that will show you how to test a water heater using a multimeter in the next section.

  1. For an electric water heater, you will also need to examine the heating element if you are planning on testing the thermostat. In particular, because open and grounded heating components provide erroneous results, this is critical. A screwdriver will be required in order to check for flaws. Using digital multimeter instruments, you’ll also need to check the water heater’s thermostat. Please go to the following stages to learn how to test a water heater using a multimeter. 1. Turn on the water heater.

How to Replace a Faulty Thermostat on an Electric Water Heater

Installing an electric switch to change the thermostat on an electric water heater is as simple as turning on the water heater. Knowing how to test a thermostat allows you to do the necessary repairs without having to empty the storage tank first. In order to avoid any potential mishaps, you must first cut off the power source and check the cables for voltage before proceeding with the work. You will need to adjust both thermostats on your water heater if you want really hot water. If the problem is caused by a single thermostat, it is advised that you replace the two thermostats because they are quite inexpensive to replace all at once.

If you are unable to locate a suitable replacement from the same manufacturer, try for a similar item from another manufacturer. Don’t forget to include a non-contact voltage tester as well as screwdrivers on your shopping list.

Deactivate the Power Supply

Switching off the circuit breaker that is attached to the water heater will turn off the electricity to the water heater. Water heater breakers are typically comprised of two distinct single-pole switches with a combined 30 amp rating. Some versions, on the other hand, have more amps. The panel that covers the thermostat and heating element of your electric water heater should be removed. It is possible that you may need to use a screwdriver on some versions since the panels are bolted together.

To avoid electrical shocks, make sure there is no current flowing through the thermostat.

Pull out the Faulty Thermostat

By tripping the circuit breaker that is attached to the water heater, you may turn off the electricity to the unit. Water heater breakers are typically comprised of two single-pole switches with a combined 30 amp rating that are installed side by side. Some versions, on the other hand, have higher amp capacities. The panel that covers your electric water heater’s thermostat and heating element should be removed. A screwdriver may be required in some cases due to the presence of screwed-in panels on select versions.

To avoid electrical shocks, make sure there is no current flowing through the thermostat’s circuit.

Set Up the New Thermostat

Insert the new thermostat into the matching clips on the wall. Check to see that it is properly resting on the surface of the storage tank. Connect the circuit wires to the matching screw terminals on both sides of the board. Tighten the screws to secure them in place. Increase or decrease the temperature setting on your thermostat according to your preferences. A flat blade screwdriver will be required in this situation. It is recommended that you set the temperature to 120 degrees Fahrenheit.

Add Final Touches

Replace the thermostat chamber panel as well as the insulation surrounding it. By resetting the circuit breaker, you may reconnect the circuit to its power supply once more. Allow for two hours of operation from the water heater, then check the hot water tap to verify whether the water is sufficiently heated

How to Troubleshoot a Defective Thermostat on An Electric Water Heater

Troubleshooting the thermostat on your water heater may appear to be a complicated task. This tutorial will assist you in doing this task without the need to consult an expert.

  1. To turn off the electricity to the thermostat, go to the circuit breaker and turn it off. Because it protects you from electrical shocks, this procedure is really necessary. A two-pole breaker will cause both breakers to trip at the same time if you are working with two breakers. Remove the two panels that protect the thermostat from the wall. Insulation that corresponds to the aperture is found beneath the cover. Remove the item and store it aside for later installation. The thermostat and heating element should both have a plastic panel on them. A button may be found beneath the panel. It should be pressed to confirm that it is in great working order. Keep an eye out for a “snapping” motion when you press the button. In the event that you experience any, turn on the power and allow it to run for a few minutes. Check to see whether there is no power to the unit, especially if you want to continue working on the equipment. Make use of a non-contact voltage tester to test a pair of wires towards the top of the circuit. If you don’t see any lights or hear any beeps on the meter, this indicates that there is no energy flowing through the thermostat. Even if you do not see any readings on the tester, continue to work on the machine as if there were power. Remove the plastic cover from the thermostat by gently pulling it out or unscrewing it. Avoid inserting your fingers too far inside the device in order to avoid potential mishaps. Remove the battery and connect it to a voltmeter with a minimum voltage of 240 volts on it. Place the test lead on all of the higher screws. Do not remove the lead. If you get a reading, it means that the power is switched on
  2. Turn it off and check again later. There must be no electricity running through the device.

Wrap Up

An electric water heater, like a tankless water heater, is equipped with a thermostat.

Fortunately, just a few equipment are required for testing and repairing a malfunctioning thermostat, including a multimeter and a pair of screwdrivers. To solve this dilemma, you don’t even need to have any special abilities. All you have to do is follow these simple instructions.

  • Turn off the electricity
  • Check the unit’s functionality. If there are any issues, you should remove the present thermostat and replace it with a new one. In order to avoid any shocks while working, it is recommended that you periodically check the equipment for any current.

We really hope you found this information informative. If you have any remarks, please leave them in the comment section below.

How to Test a Water Heater Thermostat and Replace it if Needed

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Water Heater Thermostat Basics

The electric water heater thermostat is positioned on the front of the water heater tank, beneath an access panel that provides access to the tank. The thermostat is in charge of maintaining the temperature of the water in the tank. It does this by opening and closing connections in order to switch on and off the flow of electricity to the heating elements, which are immersed in the tank and are responsible for heating the water in the tank. There is a bi-metal switch that is flush with the wall of the water heater’s tank and operates the water heater.

The bi-metal switch on your water heater will open when the temperature of the thermostat reaches 120°F, preventing electricity from flowing to the heating element.

When the temperature falls below the 120°F set point, the polar opposite occurs.

This video will demonstrate how the thermostat on your water heater operates.

Identifying Which Thermostat is Faulty

With a capacity of 30 gallons or more, the vast majority of water heaters employ two heating elements, each with its own thermostat. It is hooked into the thermostats so that only one heating element is activated at a time. The upper thermostat is responsible for bringing the top third of the water in the tank to the desired temperature. After that, it shuts off and switches the electricity to the lowest thermostat setting. The two thermostats are not identical, and if one fails, the water heater will react in a different way than if the other fails.

How to Identify Which Thermostat Failed

  • Water heater will cease heating water completely if your higher thermostat (or heating element) is faulty. Because the top thermostat is in charge of the lower thermostat, if the upper thermostat fails, the lower thermostat will never turn on. Theft of the Lower Thermostat- If your lower thermostat (or heating element) fails, you will either notice that the hot water is tepid or that the hot water is quickly depleted. Due to the fact that the higher thermostat will signal the heating element to heat just the top third of the water in the tank, but the lower thermostat is defective and is unable to switch on the bottom heating element, this occurs.

How to Test a Water Heater Thermostat

First and foremost, you must ensure that there is no discontinuity. You’ll need a Phillips and a flat head screwdriver, as well as a multimeter, to complete this task. Always switch off the electricity to your electric water heater before starting any work on it. Then double-check that the power has been turned off. Here’s how it’s done:

Shut Off the Power to Your Water Heater

  • At the main electrical panel, turn the breaker to the OFF position. Remove the thermostat’s access cover and set it aside. Removing the insulation and plastic protective cover is the first step. Touch one of the multimeter’s probes to a grounded metal object (such as the tank casing, which is unpainted metal)
  • Connect the second probe to each thermostat terminal as well as the terminals of both heating elements. At all times, the multimeter should display zero voltage (Zero). To visually see how to switch off the electricity to your water heater, watch the video below.

How to Test a Water Heater Thermostat for Continuity

It’s time to check the thermostat on your water heater now that the electricity has been turned off at the main electrical panel. First and foremost, you must understand what you are doing.

  • Check to see if the reset button has been pressed. If it has, go ahead and reset it
  • Otherwise, wait. Remove the wires from the thermostat and set them aside. Pay close attention to how they are linked together.
  • By pressing the reset button, one of the multimeter leads will be connected to the left side terminal. The other multimeter lead to the other terminal on the left side of the reset button should be touched as well. If the thermostat has continuity, the multimeter should show a reading close to one hundred percent. This indicates that the thermostat is malfunctioning and must be changed
  • Otherwise, this indicates that the thermostat is working properly. Rerun the test on the right-side terminals by pressing the reset button one again.
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Step number three.

  • Test the lower area of the thermostat by connecting one lead to the common terminal (located next to the temperature setting) and the other lead to the left heating element terminal
  • This will reveal whether the thermostat is functioning properly. If the temperature of the water in the tank is lower than the thermostat’s set temperature, the resistance reading on the multimeter should be near to 0 ohms. Move the lower lead from the left heating element terminal to the right heating element terminal by pulling it up and out. The continuity indicator on the multimeter should indicate “NO continuity.” If the temperature of the water in the tank is higher than the thermostat’s set setting, you should observe the polar opposite of what you want. If the upper thermostat is functioning properly, you’ll need to check the lower thermostat as well.
  • Disconnect the power cables from the lower thermostat and turn off the electricity. Using the first lead, connect it to a single terminal and the second lead to the other terminal
  • If the water temperature is lower than the thermostat’s set temperature, the resistance shown by the multimeter should be near to 0 ohms. If the water temperature is higher than the thermostat’s programmed temperature setting, the multimeter should show no continuity
  • Otherwise, it should. A thermostat with the opposite reading indicates a defective thermostat.

Watch the Video

Generally speaking, if you’ve decided that one of your water heater’s thermostats is malfunctioning and must be changed, it’s preferable to repair them both at the same time. Thermostats are available for purchase singly or as part of a set.

Buying a Tune-up Kit

Perhaps you might consider getting a tune-up package, which will contain both the upper and lower thermostats, as well as two new heating elements for your furnace. It may cost a few dollars extra, but you’ll notice a significant improvement in the way your water heater functions in most circumstances. This is especially beneficial if your water heater has at least a few more years of useful life left in it. Tune-up Kit for Any Vehicle The ZERO EWH-01 Tune-up Kit is designed to work with the majority of electric water heaters.

An OEMtune-up kit for electric water heaters is also available from Rheem.

You should replace your heating elements at the same time as your water heater if you wish to do so. Make sure the heating elements are the suitable size and type for your water heater. This article will guide you through the process of selecting the appropriate heating element.

Buying Upper or Lower Thermostats

Although it is usually a good idea to repair both thermostats at the same time, there are situations when it is just more convenient to replace only the malfunctioning one. This is especially true if you have plans to acquire a new water heater in the near future and are only attempting to get your present water heater up and running until you can make the purchase. Camco Thermostat, Upper Thermostat This upper thermostat from Camco offers a built-in reset button, changeable temperature settings, and a one-year guarantee on the mechanical components.

If you want a lower thermostat, theCamco 8123is a decent, low-cost choice, and of course,Rheem also sells one in this configuration.

Single Element Water Heaters

Although we’ve concentrated on double-element water heaters, certain models, particularly those with tanks of 20 gallons or less, may heat water with a single heating element. These water heaters are connected in a different way and require a single element thermostat to function properly. They may appear to be very similar to an upper dual element thermostat, however they have fewer wire terminals than an upper dual element thermostat. Camco Thermostat with a Single Element The Camco 07843 Single Element Thermostat is equipped with a built-in safety switch, changeable temperature settings, and a protective cover for further protection.

How to Replace a Water Heater Thermostat

Water heater thermostat replacement is a simple process that you should be able to complete on your own without any difficulties. Although many homeowners are comfortable doing the work themselves, many choose to employ the services of a professional plumber. You’ll need a Phillips and a flathead screwdriver, as well as a multimeter and your new thermostat to complete this project. Make certain that the thermostat you select is compatible with your water heater.

Shut Off the Power to Your Water Heater

  • At the main electrical panel, turn the breaker to the OFF position. Remove the thermostat’s access cover and set it aside. Removing the insulation and plastic protective cover is the first step. Touch one of the multimeter’s probes to a grounded metal object (such as the tank casing, which is unpainted metal)
  • Connect the second probe to each thermostat terminal as well as the terminals of both heating elements. At all times, the multimeter should display zero voltage (Zero).
  • Disconnect the cables from the thermostat. Pay attention to how they’ll be reconnected
  • This is important. To remove the thermostat from the retaining bracket, carefully lift it out.
  • The old thermostat should be replaced with a new one. Check to see that it is the proper thermostat for your heater. Check to see that the rear of the thermostat is snugly pressed against the tank’s inside. The cables to the thermostat should be reconnected. Replace the protective cover with a new one.

Step number three.

  • Check and make necessary adjustments to the temperature setting to 120°F. Remove the insulation and access cover and replace them. Activate the water heater’s power supply

Watch the Video

Check and make any adjustments to the temperature setting to 120 degrees Fahrenheit Insulation and access cover should be replaced. Start by turning on the water heater’s electric power.

Are Electric Water Heater Thermostats Universal?

No. Some water heaters employ two heating elements, while others only use a single heating element to heat the water. These are not the same, so you’ll want to make sure you get the right one for your water heater before buying it. Aside from that, in dual-element water heaters, the lower and top thermostats are not the same and cannot be used in combination. Because the top thermostat is bigger and contains more terminals than the lower thermostat, it is preferred. As a recommended practice, always check the information tag on your water heater to ensure that you are purchasing the suitable thermostat for your system.

How to Reset a Water Heater Thermostat?

No. A single element or two heating elements are used in certain water heaters, while others employ a single element or two elements. You must be certain that you choose the proper sort of water heater since they are not interchangeable. With addition, in dual element water heaters, the bottom and higher thermostats are not the same and cannot be used interchangeably with one another. Because it is bigger and has more terminals than the lower thermostat, the upper thermostat is preferred. As a recommended practice, always check the information tag on your water heater to ensure that you are purchasing the proper thermostat for your system.

Despite the fact that there are dozens of domestic electric water heater manufacturers, and the vast majority of them can use OEM components, investing a few more minutes up front may save you time, money, and irritation down the road.

What Causes a Thermostat to Trip?

There are a variety of reasons why a thermostat may malfunction. A defective thermostat or heating element are the most typical causes, but it can also be caused by a poor electrical connection or even a malfunctioning reset button. If you are having trouble determining the source of the problem, you should consult with a professional plumber.

Test Your Water Heater Thermostat In Minutes: 13 Steps

Because you’ve had a particularly long day, you’ve made the decision to take a shower before retiring to bed. When you turn on the faucet, you’ll be sprayed with ice-cold water. However, where is the hot water? This is nothing new. It will never come! Uh-oh! If this seems like a familiar scenario, you may be the victim of a malfunctioning water heater thermostat, but how can you be certain? We can determine whether or not the thermostat is the source of the problem with a few simple tools and some good old-fashioned elbow work, though.

  • A flathead screwdriver and a digital multimeter are the equipment you’ll need for this project.
  • It’s also a good idea to get your hands on the heater’s service manual if you have one.
  • It is possible that you will get wounded if the essential safeguards are not performed.
  • With that being said, let’s get started.

13 Steps to Test a Water Heater Thermostat

  1. Turn off the electricity. Before you begin, be sure that the power has been turned off. Then double-check your work. Then double-check everything. The fact that it is switched off is highly crucial in order to avoid injury. Locate the water heater circuit breaker on the circuit board by looking at it. Depending on who built the system, it may be labeled as something different, but it should be obvious enough that you would know it was for the heater. However, if you are unsure, you should stop right here and consult with a specialist
  2. You can get to the thermostats. When you go to your water heater, you will see two panels: one that is higher up on the unit and one that is lower down. One of the panels will be higher up on the unit and the other will be lower down. These include the thermostat and all of its parts
  3. And Remove the covers from the access points. To remove the top and bottom access covers, use a flathead screwdriver to unscrew them. A flap with a cutout for the thermostat will be located inside
  4. Flip the flap up to reveal the insulation underneath it. Depending on how it was cut, you may be able to flip it down as well. In any case, check to see that it isn’t interfering with anything.
  1. Optional: Use masking tape to keep the flap out of the way. If you were successful in obtaining some tape, remove the flap.
  • Remove the protective plastic cover. The screwdriver will enable you remove it from the thermostat, which you should do immediately and store somewhere secure.
  1. Optional: Check the voltage with the voltage stick to ensure that the electricity is working properly. Make a double-check to ensure that there is no electricity flowing through the water heater at all times. Placing the stick against any of the terminals and seeing whether or not the stick goes off is recommended. If it does, you’re in trouble
  2. If it doesn’t, you’re in the clear. If it doesn’t, you’re in the clear. Repeat the procedure for both the top and lower thermostats.
  • Prepare your multimeter for use. Inspect the reset button on your multimeter after you have set the dial to the lowest ohms of resistance level. A reset button will be located on the top thermostat. This can be triggered when the water in the tank becomes too hot for a variety of reasons (which we’ll discuss in further detail later). To do this is referred to as “tripping the power.” Reset the reset button by pressing it all the way in if necessary. Disconnect the power cables from the wall outlet. Despite the fact that there is no power flowing through the device, you must separate the connections in order to isolate the thermostat. Take notice of the wires’ alignment in relation to one another. After that, use your screwdriver and undo the terminals and wires until they are no longer connected. Make sure you do this for both the top and bottom thermostats
  • Then check the higher thermostat to see whether it is still functional. There will be several mini-steps in this, so please make sure to follow through and do not skip any of them! We’ll have to check to see if the top thermostat is operational.
  1. Connect the lead of your multimeter to the reset terminal. This should be exactly next to the reset button on the controller. It would also have been the terminal that did not have any power lines running to it
  2. As a result, Move the second lead to the terminal on the left-hand side of the board. Keep your first lead connected to the reset terminal at all times when doing this. This will be the one that did have the power cable attached to it
  3. This will be the one that did not. Make a note of the reading from your multimeter. The top thermostat has lost continuity and must be replaced if it displays a reading of 1. The resistance should be zero ohms or very near to zero ohms if the device is in proper functioning condition. Move the second lead to the terminal on the right-hand side of the board. Remember to maintain your first lead connected to the reset terminal at all times when doing this. Additionally, this terminal would have had a power cable connected to it. Make a note of the reading from your multimeter. It should be noted that if it reads 1, there will be no electrical continuity. If it reads zero, you’re in the clear
  4. If it reads one, you’re in trouble.
  • Determination of whether or not the water temperature is lower or greater than the given setting This will also have mini-steps, so let’s get started
  1. Connect the lead from your multimeter to the left common terminal. This can be located in the lower portion of the thermostat
  2. However, it is not visible. Make your way to the upper heating element terminal with the second lead. While you’re doing this, be sure that your initial lead is still connected to the common terminal. Make a note of the reading from your multimeter. Alternatively, if your water temperature is lower than it should be, the first reading will be zero ohms (or very near to it), while the second reading will be one (indicating no continuity)
  3. Relocate the second lead to the terminal of the lower heating element. Check that your first lead is still connected to the common terminal, just as you did in step 12.2. Make a note of the reading from your multimeter. If your water temperature is higher than it should be, the first reading will be 1 (no continuity), and the second reading will be 0 ohms (or very near to it)
  4. If your water temperature is lower than it should be, the first reading will be 0 ohms (or very close to it)
  5. Keep track of if the temperature of your water is higher or lower than it should be. If you want to check the lower thermostat, you will need something to compare it against.
  • Examine the lower thermostat to see if it is in good working order. This procedure will be similar to step 11, which involved inspecting the top thermostat for structural integrity. For the record, you should have double-checked to see if the power was still on and that the power connections had been unplugged before proceeding.
  1. Place your leads on the two terminals of your multimeter using your multimeter. 0 ohms should be the measurement if your water temperature is lower than it should be
  2. Otherwise, it should be 1. (or close to it). If the water temperature is greater than it should be, the measurement should be 1 (no continuity)
  3. Otherwise, the value should be 2 (continuity).
  1. So, what’s the ultimate word on the matter? Is it necessary to replace it? If the readings on the upper and lower thermostats are diametrically opposed, then the lower thermostat must be changed. More specifically, if the upper thermostat indicates that water temperature is greater than it should be, but the lower thermostat indicates that water temperature is lower than it should be (or vice versa), your lower thermostat is faulty.
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And that’s the end of it! Phew! The process was lengthy, but you have now decided whether or not your water heater’s thermostat is to blame for your problem. But, before you go ahead and put everything back together, you might want to think about lowering the temperature of the water heater a little.

Adjusting Water Heater Thermostats

The temperature is typically set at 140°F (60°C) by default by most manufacturers. Anyone living in a residential situation does not require this level of care! By lowering the temperature to a lower and more realistic figure, you can save energy (and money).

How Do I Adjust the Temperature?

Temperature defaults at 140°F (60°C) for the majority of manufacturers. This is substantially more than somebody living in a household situation need. By lowering the temperature to a lower and more realistic level, you may save electricity (and money).

Why Does My Water Heater Keep Shutting Down?

Having changed the temperature and double-checked your thermostats to ensure that they are all in proper operating condition, what is causing the water heater to shut down so frequently? As previously indicated, the reset switch, which is integrated into the thermostats, is responsible for this behavior. Whenever the water temperature within the tank rises to an unsafe level, the reset switch will disconnect the power to the heater and turn off the water heater. Here are a handful of possible explanations on why this may be occurring.

  • The heating element is on its last legs. Your heating element’s integrity may be affected as a result of its advancing age. As a result, it will not function as intended. If this is the case, the water in your tank may get overheated, resulting in the reset feature being activated by the tank. The heater will then shut off as a result of the Energy Cut-Off (ECO) Switch being activated. The ECO switch prevents the water from becoming overly hot, and it works in concert with the reset function to provide still another failsafe. Over time, it might become worn out and eventually shatter. Although this alone would not cause the heater to shut down, it is typically a sign of additional issues, such as faulty wiring. If everything else appears to be in working order, it’s possible that the reset switch is tripping due to a short circuit produced by bad wiring. If this wire is exposed to water in any way, whether directly or indirectly, it will represent a significant risk and should be handled by a qualified electrician. Do not attempt to solve or diagnose this problem on your own
  • Instead, contact a professional.

Conclusion

And that’s the end of it! The problem with your water heater has hopefully been identified with the help of a few of screws and some poking around with your multimeter. Otherwise, at the very least you’ve altered the temperature so that you may save some energy (money). If you like this post, consider subscribing to our email list so that you can get a head start on all of our future publications.

Not ready to make the commitment? It’s not an issue! Everyone is welcome to peruse our other articles, and who knows what they could find? You might be able to avoid anything else in your home from needing to be fixed by acting ahead of time.

How to Test an Electric Hot Water Heater Thermostat

Finally, we’re done! The problem with your water heater has hopefully been identified with the help of a few screws and some poking around with your multimeter. Otherwise, at the very least you’ve altered the temperature so that you may conserve some energy (money). Sign up for our email list if you like this post so that you can get a head start on all of our new content. You’re not up for the challenge? No problem. It’s not a big deal. Browse through our other articles at your leisure; who knows, you might find something interesting.

  • A Phillips screwdriver, a flat-head screwdriver, and a multimeter are all necessary tools.

Warning

An assortment of tools, including a Phillips and a flat-head screwdriver, as well as a multimeter

Step 1

Turn off the water heater circuit breaker, which is located within the central service panel.

Step 2

Using a Phillips screwdriver, remove the top and lower access panels from their frames. Electric hot water heater access panels are often located on the side of the unit and have an electrical warning placard affixed to them.

Step 3

Using a Phillips screwdriver, pry the upper and lower access panels away from the wall. Electric hot water heater access panels are often located on the side of the unit and have an attached electrical warning placard.

Step 4

Using a Phillips screwdriver, remove the top and lower access panels. The access panels are located on the side of the electric hot water heater and are often labeled with an electrical warning symbol.

Step 5

Place one probe on the left screw terminal with the white wire and another probe on the terminal directly above the white wire on the screw terminal on the right side of the board. The reading on the multimeter should be zero. (See illustration) Any other value on the multimeter shows that the thermostat is not working properly.

Step 6

To do this, use the flat-head screwdriver to lower the top thermostat to its lowest setting. During this procedure, you should hear a clicking sound from the thermostat. One probe should be placed on the terminal above the white wire, and the second probe should be placed on the terminal to which the black wire is connected. In this case, the reading on the multimeter should be zero once more.

Step 7

Keep the higher thermostat on its lowest setting while you test the lower thermostat on its highest setting. Set the lower thermostat to the highest setting by using a screwdriver to turn it. Make a connection between each terminal on the bottom thermostat with one probe of the multimeter. There are just two connections on the bottom thermostat. The multimeter should show a reading of zero when this occurs.

Step 8

Reinstall the defective thermostat, and then replace the insulation that was previously placed over the thermostats and heating components. Replace the access panel covers, locking them in place with the retaining screws that were previously installed. The electric water heater will be activated after the circuit breaker has been reset.

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. Fortunately, if you have someone who knows what they’re doing to guide you through the procedure and a few basic tools, the process is pretty simple. When bathing or cleaning, no one enjoys using cold water. If you are experiencing no hot water, we will need to examine the water heater thermostat and, if necessary, replace it. 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.

  1. Modern home water heaters are equipped with two heating components as well as two thermostats.
  2. The higher thermostat differs from the lower thermostat in several ways.
  3. It is quite rare for both thermostats to fail at the same time (although I do recommend replacing both when one fails).
  4. 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

All water heater thermostats are not the same, and they are not all interchangeable. Between single-element and dual-element water heaters, there are several differences in the thermostats that may be found. With addition, in 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 voltage present in the heater. There’s a data tag attached to the water heater that contains this information.

It is inscribed on the end of the heating element where the voltage may be found if you look carefully.

In addition to the more than 50 household tank-style electric water heaters now available on the market, the thermostats on the majority of these types are intended to be interchangeable.

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

Make your go to your circuit board and locate the water heater breaker to switch off the power supply. Discover and switch off the breaker that is labeled “water heater” or “hot water” in the electrical panel box where the water heater is located.

See also:  How To Change Uv Lamp In Water Filter?

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.

  1. This means that the thermostat is not functioning properly and must be replaced.
  2. For a demonstration, please see the video above.
  3. 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.
  4. 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.

For those who have not yet tested their thermostats, we will first go through the preparatory processes.

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.

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?

In fact, the top and lower thermostats should both be set at the same temperature. The dip tube is responsible for delivering cold water to the bottom of the tank. Having consistent settings across the tank helps to keep the temperature consistent throughout the tank.

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

Simply said, that’s the whole story! Water heaters aren’t too difficult to maintain, and replacing a thermostat can be completed in a matter of minutes if you know what you’re doing and have the right tools. The most important thing to remember while working with electrical equipment is to avoid taking shortcuts. Although it is possible to change your water heater thermostat in a short period of time utilizing the correct skills and tools, doing so is not recommended. DISCLAIMER: The information provided on HomeInspectionInsider.com is not intended to be professional guidance.

It is owned and operated by Hubert Miles who is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by placing advertisements and links on their websites that direct traffic to Amazon.com (hereinafter referred to as “Amazon.com” or “Amazon.com Associates Program”).

As an affiliate, HomeInspectionInsider.com participates in a variety of affiliate programs with other websites. Hubert Miles receives a commission for recommending visitors and commerce to these businesses.

Hot Water Heater Thermostat Testing

You can find detailed instructions for testing a hot water heater thermostat in the section below. Although this article is dedicated to dual element water heaters, single element water heater thermostats are examined in the same manner.

How to test a thermostat

The tests that follow will be carried out with the electricity turned on. You will require a multimeter, as well as knowledge on how to use it securely. If you want, you can test water heater thermostats with the power turned off. Go to the water heater thermostat and test it. Allowing someone to distract you while you are testing is not recommended. Make sure that no one comes close to the water heater until you’re through working on it. Please take the time to read the complete instructions before beginning.

Duel element residential water heater

At no point do both components heat at the same time. In the beginning, there is a tank of cold water. The higher element is responsible for heating the water in the tank’s top half. When the higher thermostat is satisfied, the upper element will be turned off and the bottom element will be turned on again to begin heating. It is not possible to do the following test if the water temperature is excessively high. This indicates that you may be dealing with a grounded element. If you want to learn more about grounded elements, check our water heater element testing.

You should first inspect the components before attempting to test the water heater thermostat.

Test hot water heater thermostat (upper)

Turn off the electricity to the water heater. Remove all of the access panels, insulation, and plastic safety coverings from the building. Check to see whether the resetbutton has been tripped by accident. The temperature of the higher (top) thermostat should be set to the highest setting with a tiny screwdriver (see pic). Bottom the thermostat temperature to its lowest setting on the lower thermostat. Turn on the water heater’s power supply by pressing the power button. In order to ensure that there is voltage going into the water heater, check the two wires above the resetbutton (see pic).

When the elements on this water heater are operating, the voltage should be 240 volts.

It is necessary to replace the thermostat if you do not have electricity at the heating or cooling element.

Test water heater thermostat (lower)

Reduce the temperature of the top thermostat to its lowest setting. As you flip the thermostat dial, you should hear the thermostat turn off. If you don’t hear it, wait a few minutes for the water to warm up before continuing. Set the lower thermostat temperature to the maximum setting and check the voltage of the lower element on the lower element. If you have electricity at the element, you may let the water to warm up a little bit longer. Reduce the temperature setting on the thermostat. You should be able to hear it turn off.

If you don’t have any power at the element, proceed to the next stage in the process.

One multimeter probe should be placed on the top contact screw, and the second probe should be placed on the water tank (see pic).

If you are unable to obtain a reading, the top thermostat should be replaced.

If you have authority, go to the next step. One meter probe should be placed on the bottom contact screw, and another should be placed on the water tank. If you don’t have 120 volts, you need replace the thermostat on the bottom level.

Other pages you might be interested in.

A step-by-step instruction for changing an electric water heater thermostat is available online. Checking and replacing the gas valve/thermostat on a water heater is covered in this video. Water heater temperature – How to monitor and regulate the temperature of a water heater’s thermostat. Thank you for taking the time to look into hot water heater thermostat. Water heater thermostats: water heater home, water heater thermostats, hot water heater thermostats

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