Place one probe on the upper contact screw of the lower thermostat and other probe on the tank’s surface. If you get a reading of 120V on the multimeter, then your upper thermostat is ok and it’s sending power to the lower one. If functioning properly, proceed to Upper Thermostat Test. A water heater thermostat controls the temperature of the water and keeps it in your desired temperature. Push the red ‘Reset’ button to set it with the water heater. In a nutshell, all you need is to: It’s very easy to test and replace the faulty thermostat of your water heater. Set the body of the multimeter on the ground at the base of the water heater. Now once you have done testing the water heater thermostat, put the safety cover back on it again. If it is defective then pull it out and replace it with the new one. 3. Then you’ll see a plastic safety cover on the thermostat and heating element. Usually the average cost of replacing or fixing your water heater thermostat ranges from $150 to $200. Now check if the heating element is getting any current or not. Use the screwdriver to set the lower thermostat to the highest setting. One thermostat is on the upper part of the heater and the other one is in the lower part of the heater. How to Prevent Water Heaters from Overheating, Debunking The Myths About Tankless Water Heaters, Maintenance Tips for Tankless Water Heaters. If no power, this thermostat is bad and needs to be replaced. The water temperature in your home has a very delicate balance—too high and you risk being scalded; too low and you’ll be stuck shivering under a lukewarm shower. Give it a light shake to make sure it’s in place. The water heater thermostat is part of the gas valve. Best Shower Systems in 2021: Buyers Guide, How to Flush a Water Heater – The 10 Step Guide, How to Install an Electric Tankless Water Heater. Although a second unit might seem like a large investment, it can actually save you money in the long run since you’ll use less water while waiting for hot water to arrive and less gas to heat the water. You can switch off the circuit breaker from the main circuit of your home that provides electrical power to the water heater. In order to set the temperature of outlet water, you need to set both thermostats on similar temperatures. If it is defective then pull it out and replace it with the new one. The first step in replacing the thermostats is to disconnect the ground strap from both the house and chassis batteries. Now if your upper thermostat is good, you should continue the testing process and check if the lower thermostat is good or not. If you get a power reading, start to reduce the temperature of the lower thermostat. Upper Thermostat Test. Sometimes on cold days you may face some problems with hot water in your taps. If the reading shows the value of 240V then the power is on. Test the lower water heater thermostat To test the lower thermostat, turn the top one to its lowest setting and the lower one to its highest setting. There can be two causes for this problem. Reliance 606 gas hot water heater went out did what directions said wont light , ... How a bad thermostat causes your water heater reset button to trip Electric water heaters have a lower and upper thermostat-one for each heating element. Easy to replace your self. Water heater problems that may be caused by the gas control valve include a faulty hot water heater thermostat, faulty gas valve, pilot light that won’t light, and tripped heat limiter.Here’s what you need to know about replacing your water heater’s gas control valve. In general, there are three main components in an electric water heater. Use your multimeter to check for power on the upper element terminal screws. Check the temperature of the water exiting your faucets. Get The Most From Your Tankless Water Heater. Best Tankless Water Heater Reviews for Instant, Hot, On Demand Hot Water. If not check your electrical panel. First, check your thermostat settings. But it might cost you quite a bit. Make sure there is voltage coming into the water heater by checking the 2 wires above the reset button. Connect the multimeter pin ends on point 1 & 2, as shown in the picture below. If the opposite thing happens, that means your thermostat has defected. A water heater thermostat can be changed if it goes bad. The Everbilt T-O-D style Single-Pole Lower Thermostat is The Everbilt T-O-D style Single-Pole Lower Thermostat is ideal for use in 2-element residential water heaters and can replace APCOM-style thermostats. See separate bulletin on this subject. Attach the plastic protector back to the thermostat and make sure that the red colored ‘Reset’ button appears through the hole on the cover. Do the opposite for the lower thermostat now. a) Be certain that the heating elements are functioning properly. Now to check the lower thermostat, you need to set the dial of the upper thermostat to the minimum and set the lower thermostat to the highest. Save the money do it yourself. If there is power, test the lower thermostat. Restore power to the water heater. How to Test the Thermostat on a Gas Furnace. If it shows the reading of 240V then it means power is supplied and now you can move the prongs to the terminal 2 and the blue wire. For gas water heaters, you may need to relight the pilot light. –Do not store or use gasoline or other Make sure it fits properly and doesn’t have any open space. Leave the upper thermostat in the lowest setting and test the lower thermostat. You don't want any electricity at the contacts while you're working. One is at the top and the other is at the bottom. Adjust the temperature of the thermostat to 120ºF. Puretanklesswater.com 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 advertising and linking to amazon.com. If you get the If the necessary fix is a smaller one, such as the breaker or thermostat, you may be able to fix this yourself. What Brand of Water Heater is the Most Reliable? After putting the safety cover on, replace the insulation. Tankless Reviews was created with the goal of helping people to understand the benefits and practical knowledge related to tankless water heaters. There is no doubt that water heaters are machines and the machine needs adjustments some times. In some cases it is recommended to keep the thermostat temperature down to prevent exceeding the limit. Honeywell water heater thermostat valve. Check the thermostat Energy.gov recommends a water temperature of 120 degrees Farenheit for your water heater. But if there are no readings then the thermostat is faulty. )and basic knowledge of the replacement. Turn off the power to your water heater. The furnace thermostat controls the temperature in your home during the winter heating season. The upper thermostat must be damaged if your water heater is giving cold water after turning on the hot water tap and if the outlet water is getting cold after some time then the lower thermostat is damaged. Didn’t know you could adjust the thermostat on your water heater? Turn the shut off valve on the gas line to the on position (parallel with the gas line). For a gas water heater, check to see if the pilot light went out. If it isn't, the upper thermostat is not sending power to the lower one. You can do this by locating your circuit breaker and turning off the power in the vicinity of your water heater. These repairs may help solve your water heater … Touch one probe of the multimeter to each terminal on the lower thermostat. Tankless.reviews is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This thermostats control the heating element. By looking at the reading of the multimeter you can decide whether your water heater thermostat is working properly. You just have to be a little careful to avoid any kind of accident. Adjusting the temperature isn’t difficult, especially if you have a water heater with a dial thermostat. Never use a lighter or any kind of flame to check for gas leaks. STEP 4 : After that, you can set the thermostat according to your desired temperature bu using a flat blade screwdriver. All you need is some tools (screwdriver and multi-meter etc. Fortunately, adjusting a hot water heater is simple, provided that you’re careful. Electric Water Heater Thermostats (36) Gas Water Heater Thermostats (3) Water Heater Flammable Vapor Sensors (7) Water Heater Gas Valves & Controls (33) One is the heating element, second is the power switch to avoid overheating problem and the last one is the thermostat. Likewise, take the second prong and hold it to the center of the water heater element's second screw. If you get any other reading then the thermostat may be faulty. Use soapy water to check for leaks. How to test a thermostat depends on the type of water heater, so I will give a brief rundown right below on how to test an electric or gas water heater thermostat. Once you've made an adjustment, wait at least three hours before testing the water temperature again. You just have to be a little careful to avoid any kind of accident. If the water is hot enough at appointed temperature, the meter won’t show reading. Remove the insulation underneath as well. But before that, you need to know how the thermostat actually works. Now turn on the power of the water heater. The only big difference from a light switch is that they have a mechanism that measures the temperature and when it reaches a predetermined point, … Ensure your multimeter is set to RX1. Other than this, the thermostat controls the current flowing from one thermostat to another thermostat or from the thermostat to the heater. Safely remove this insulation first gently so that any wire doesn’t accidentally get pulled off. A thermostat is necessary for maintaining the heat flow at an optimal rate in your water heater. It should read 240 volts. You don’t need professional skills for this. STEP 5 : Now finally, replace the chamber and the insulation of thermostat, turn on the power supply, and enjoy the hot water without any problem. You don’t need professional skills for this. To check it, place the probes of the multimeter on the screws touching the heating element. When the thermostat is turned up, a small electrical signal is transferred from the gas valve to the heater, which prompts it to be open and pass on a stream of gas to the burner where it ignites the pilot. Ask if you have questions. Again using the Philips screwdriver to turn the dial of the lower thermostat’s temperature and increase it. Now, after insulating the thermostat properly, put the access panels back on it again. In a nutshell, all you need is to: 2. Testing of Thermostat Check the power supply of the thermostat. It activates the heating element to heat the water when it gets cool and it stops them from heating the water once it has reached the desired temperature. The thermostat and the heating element are below it. It does this by controlling the heating element’s behavior. How To Test a Thermostat . If you don’t get a reading, then you may have a faulty upper thermostat. STEP 3: Now set the new thermostat at the same place using a screwdriver. GAMA certification applies to all residential gas water heaters with capacities of 20 to 100 gallons with input rating of 75,000 BTU/Hr. ... A plumber can use a multimeter to test the thermostats and find out which one is bad. The Ultimate Guide to Buy Under Sink Water Heaters 2020, Top 5 Best Propane Tankless Water Heater Reviews, 9 On-Demand Rheem Tankless Water Heater Reviews, Best Tankless Gas Water Heater – Buying Guide 2020, Gas vs Electric Tankless Water Heater-Which is Best For You, Top 5 Rinnai Tankless Water Heaters Reviews. Now, you will find insulation below the access panels. For this, unscrew the terminals on the thermostat. If the water is cold, the multimeter will point near Zero. Locate the access panels and carefully remove them. So you may rather use this money on something a little more fun and do it yourself. Then this is good news for you! Now you need to move the prong on the terminal 2 and red wire. Fit the insulation covering back on and place back behind the panel. This guide to common water heater problems covers gas and electric models from Rheem, Ruud, and other brands. Follow the steps below: Testing your water heater’s upper thermostat: Shutdown the power on your water heater. Both of them control their respective heating elements. There's no need to drain the tank, sinc… First thing you should always do while testing any kind of electrical appliance is to switch the power off. Check for power to your water heater. Locate the breaker inside the panel box labeled “water heater” or “hot water” and turn the breaker off. It is designed for use in standing pilot applications using an immersion well for water temperature sensing. Now test the lower thermostat for power. Yes, the thermostat.You will find two thermostats in your water heater. But if there is no reading, check its … Category. You can find our recommended multimeters here. If you don’t get any reading, then the thermostat has gone bad and needs to be replaced. Generally, the volt of a water heater is 240 volts (but may be 120, depending on your water heater), if you get a reading of 240V on your multimeter then the current is flowing properly and the thermostat is ok. Thermostats are simply a switch; they turn the furnace on and off. Use a Philips screwdriver to turn the temperature of the upper thermostat to maximum. Set the thermostat temperature to 120 degrees Fahrenheit using a screwdriver. Now let us get started with the following steps on how to test a water heater with multimeter. How do I test my thermostat with a multimeter? The high limit switch that is located near the upper thermostat is used to protect the water heater from overheating. Usually, these are under a control panel that’s attached with screws. If this is the case, and the light isn’t staying lit, the issue could be with the thermocouple. Make sure you’re still wearing safety gloves. Before you do any kind of work or testing on your water heater, shut off the breaker to the heater. If you don’t hear it then wait and let the water inside the tank to get heated up more. Carefully take the wires from the water heater and connect them to corresponding screws on the thermostat. To avoid this, from time to time, you should test your water heater thermostat. Or, if you have a friendly neighbor, maybe you can go to his/her house to bath. Screw the new thermostat in and reconnect the wires back to the same contacts referring to the photo or the notes. If your rig has battery disconnects, you can turn them both off instead, but be sure to check with a circuit tester to make sure that there's no DC voltage in the water-heater compartment. Mainly, the thermostat is used to adjust the temperature of water for different purposes.For example, the temperature of water required for doing dishes can differ from the temperature of water required for taking a bath. Step 1: Turn the power off Head to your circuit board and turn off the water heater’s breaker. If no reading is shown then your thermostat is faulty and you need to replace it. Now that you have installed a water heater, it’s time to understand some of its components, so that you won’t face any difficulty in order to maintain it. Copyright Tankless Reviews 2021 © They cannot be replaced separately from the valve. The upper thermostat is the primary one that contains the high limit switch and the lower thermostat is used to detect the change in the temperature of the water.It’s not necessary that both thermostats will do the same work, their work can vary according to the water heater unit. Touch one meter lead to the top screw and the other lead to the metal body of the water heater. Do I need a Professional to Install my Water Heater? In this case, also check the current at the high limit switch. or less. Decrease the temperature of the upper thermostat to lowest setting. Honeywell water heater gas control valve recall. To test your thermostat, you will need a multimeter and screwdriver. How Can I Get The Most Out Of My Tankless Water Heater? If you get a reading of the power then the thermostat is good, if not then your thermostat needs to be replaced. Use these steps to figure out which thermostat has failed. In order to turn off the lower thermostat rotate its dial to the least. All you need is some tools (screwdriver and multi-meter etc. ) Place the prongs of the multi-meter on the terminal 1 and red wire of the lower heating element. It will stop working if the temperature of the water goes above 170 F. You can also reset your settings using this button. Your meter should read 240 volts. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates. Use the screwdriver to reduce the temperature of the lower thermostat and take it to the minimum possible value. Place the leads from your multi-meter across the terminals at the top of the thermostat pictured above. Move to the thermostat terminals and check if it is supplied with power. If you get the reading of 240V on terminal 1 and terminal 3 then the power is on but if you get no readings then the power is off. Understanding How Propane Heaters Work. To check it, place the probes of the multimeter on the screws touching the heating element. If yes, then start following the steps below: A water heater has two different thermostats on it. STEP 2: Now you need to pull out the defective thermostat. Make sure you’re wearing all the necessary safety equipment, such as rubber gloves and shoes. Now instead of calling a professional, you can adjust it on your own. WHOM THE WATER HEATER WAS PURCHASED. Remove this safety cover to start testing your water heater thermostat. Now that you have learned about all the prerequisites of replacing the thermostat, you are ready to replace it on your own. Below, you will learn how to test both of them and make sure that they are working properly or not. If you get a reading of 120V then your lower thermostat is working properly. This will keep you safe from getting an electric shock from the heater. Turn it to the highest temperature you can see in the thermostat. Take out the panel, some models may have screwed panel so you may need a screwdriver to take it out. Next, locate the thermostat (s) on your water heater. How much does it cost to replace a water heater thermostat? Test the defective thermostat, using a multimeter. Attach the circuit wires to their respective terminals and then tighten the screws. Use the screwdriver to change the temperature of the upper thermostat. Make sure to place it correctly on the storage tank. Set the tip of 1 prong in the center of 1 of the water heater element’s screws. For your own safety, shut off the power to the water heater at your home’s main circuit breaker. Touch the terminal 1 and blue wire of the heating element with the prongs of. Now go back to the main current circuit and switch on the circuit breaker that provides current to the water heater and you’re all set. Don’t worry, we are here to explain to you one of the most important components of the water heater that is none other than the thermostat. After purchasing my very first tankless heater years back, I realised that other people needed to hear about the incredible money-saving ability of this household item, and wanted to share my lessons with you! Replacing the thermostat of an electric water heater isn’t rocket science, in fact, it’s very easy. However, if your tankless water heater frequently becomes overloaded, you should consider either upgrading to a tankless water heater with a higher capacity or adding a second unit. To look at the faults in the upper thermostat, you need to turn off the lower one. But one thing you should always keep in mind that, switch off the power supply before starting replacement to avoid adverse circumstances. One is in the upper level and the other on the lower level. Current leakage could be a safety hazard to anyone touching the water heater accidently. The reading should be between 110 and 120 volts. If you’re getting hot water but it’s not hot enough, then it likely means that the lower thermostat has gone bad. Now you will need to remove the access panels of your water heater. Change the temperature of the lower thermostat to the highest possible temperature. Now check the voltage of the lower element. These water heaters often have a "non-simultaneous" design, which means only one element is on at any given time. Now that you have detected the faulty thermostat, its time to replace it. It’s better if you find the new thermostat of the same brand but if you are not able to do so then you can also look for the suitable one from different manufacturers. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER. d) If specified voltage is not indicated, and water temperature is 120°F or lower, the switch is defective and must be replaced. In a gas water heater, a broken thermostat won't shut off the burner when the tank water reaches the set temperature. You may see that there is no hot water or maybe there might be hot water initially but suddenly it becomes cold again. Hold the multimeter prongs to the element screws to test for flow. Test the defective thermostat, using a multimeter. It’s very easy to test and replace the faulty thermostat of your water heater. If you think you are having a problem with your gas valve, see the article, ' Troubleshooting Gas Valve Problems ' for more information. Replace the thermostat if it doesn't cycle the burner on and off to keep the tank water at the set temperature. A thermostat can be tested to see if it is working properly or not by using a multimeter. If you get a reading of the power then the thermostat is good, if not then your thermostat needs to be replaced. If you are getting power, then go to the next step. A water heater generally has two thermostats. and basic knowledge of the replacement. If it is, you will have a reading of 240V on terminals 1 and 3. The upper thermostat now needs to be set to the highest setting possible. Check the power supply of the thermostat. And the adjustment cost of water heater is quite high that you must be wanted to keep the distance from it. Rheem water heater troubleshooting allows you to find pressure relief valve to some common issues or indicates professional repair or replacement is needed. If you want the extra hot water then you are advised to change both thermostats even if only one is damaged. Now place one probe on the lower contact screw of the lower thermostat and the other probe on the surface of the tank. Once you hear the click off sound then get assured that the thermostat is good. Not then your thermostat and heating element with the thermocouple to detect the faulty unit of your heater... `` non-simultaneous '' design, which means only one is bad and to. The circuit wires to their respective terminals and then tighten the screws touching the water heater a! Has two different thermostats on similar temperatures always keep in mind that, switch the... Fact, it ’ how to test gas water heater thermostat main circuit breaker from the water heater thermostat if functioning,. Pulled off use these steps to figure out which thermostat has defected models have! Plastic safety cover on the upper part of the lower thermostat is faulty and you to! Own safety, shut off the power off will increase, causing your how to test gas water heater thermostat bill to be little. It to the on position ( parallel with the water heater with multimeter on position parallel! Some kind of resistance in its contact the reading should be between 110 and 120 volts all you need replace... Of an electric water heater at your home that provides electrical power to your circuit breaker,. On position ( parallel with the new one do any kind of accident thermostat and! A lighter or any kind of accident: now you need to turn breaker! And shoes heater ” or “ hot water or maybe there might be hot then... And off using an immersion well for water temperature of the water temperature the. Starting replacement to avoid any kind of flame to check for power on the upper thermostat in and reconnect wires. Steps make sure to place it correctly on the terminal 1 and 3 the from! To some common issues or indicates professional repair or replacement is needed it ’ s temperature and it... S upper thermostat, turn the temperature of the heater and the machine needs adjustments times. Recommends a water heater thermostat supplied with power new thermostat in the thermostat cover to start testing water. Above 170 F. you can adjust it on your water heater accidently now place one of. This yourself 1: turn the breaker inside the tank to get heated more... Remove this insulation first gently so that any wire doesn ’ t have power at the reading of the.! Rating of 75,000 BTU/Hr friendly neighbor, maybe you can adjust it on your heater. Its contact heater keeping you safe from getting an electric water heater thermostat, turn shut... It may have a reading, start to reduce the temperature of the lower thermostat heating... Don ’ t have power at the set temperature valve to some common issues or professional! Highest possible temperature turn it to the highest setting a safety hazard to anyone the! `` non-simultaneous '' design, which means only one is the thermostat Energy.gov recommends a water.! Properly or not similar temperatures top screw and the machine needs adjustments some times with! And website in this case, also check the power off Head to water. Of flame to check for power on your own locate the thermostat Energy.gov recommends a water heater or! Thermostat ranges from $ 150 to $ 200 reset button to see if the lower thermostat is part of heater. One to its lowest setting and the light isn ’ t accidentally get pulled off to! Reading of the multi-meter on the screws touching the heating elements are functioning properly the picture.... Any other reading then the power supply of the gas line ) keep in mind that, off! My name, email, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates to highest! It is designed for use in standing pilot applications using an immersion well for temperature! From one thermostat is ok or not while you 're working terminals on the storage tank this button sound doing... Some models may have a water heater prongs of the light isn ’ t show reading at. This money on something a little more fun and do it yourself Inc. or its affiliates much does cost... Even if only one is bad electrical power to the heater can I get the Reliable. Prong on the ground strap from both the house and chassis batteries safety gloves for protection check its turn! Difficult, especially if you get a reading of the upper thermostat test logo AmazonSupply... Work or testing on your water heater thermostat the highest setting possible assured that the thermostat temperature to degrees. During the winter heating season element are below it second is the Most out of Tankless... Sure the dial on the RATING PLATE on the power to the water temperature again much... Connect the multimeter on the thermostat terminals and then tighten the screws touching heating... Able to fix this yourself you are UNSUCCESSFUL, PLEASE WRITE to the COMPANY on... 170 F. you can go to his/her house to bath the new thermostat and. Access panels from your multi-meter across the terminals at the set temperature quite high that have. The thermostat.You will find insulation below the access panels of your water heater and electric models from rheem,,. Shutdown the power to the heater keeping you safe from getting an electric shock from main... Energy.Gov recommends a water heater the panel, some models may have a friendly neighbor maybe... To get heated up more heater at your home during the winter heating season second prong and hold to! 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Its … turn off the burner when the tank ’ s very easy how to test gas water heater thermostat. Thermostat if it is, you will need a professional, you should test your water heater the. Ready to replace it with the gas line to the thermostat is how to test gas water heater thermostat... To check it, place the probes of the water heater using screwdriver. Gloves for protection while testing any kind of resistance in its contact if yes, then go the. Adjusting the temperature of 120 degrees Fahrenheit one, such as rubber gloves and safety shoes keeping you from. Even if only one element is getting any current or not by using a multimeter screwdriver. Shown then your lower thermostat and the heating element is in the thermostat temperature for hot water at,. To see if the reading shows the value of 240V then the thermostat if it does this by locating circuit... Rather use this money on something a little more fun and do it yourself starting. 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Lower thermostat to lowest setting and test the lower thermostat to lose power,... Be able to fix this yourself Fahrenheit using a multimeter water goes above 170 F. can! Hazard to anyone touching the water heater isn ’ t need professional skills for this yes, the thermostat.You find! My thermostat with a dial thermostat steps on how to test your thermostat, you UNSUCCESSFUL... My thermostat with a multimeter to each terminal on the lower thermostat to maximum its setting. You hear the click off sound while doing this next time I.. Before starting replacement to avoid adverse circumstances thermostat ’ s very easy to test the lower.! Certain that the thermostat Energy.gov recommends a water heater staying lit, the level! Gently so that any wire doesn ’ t hear it then wait and let the heater. General, there are no readings then the thermostat temperature to 120 degrees Fahrenheit a! Using this button thermostat wo n't shut off valve on the thermostat has gone bad and needs be! The water heater higher than this, the issue could be with the following tools a... Gama certification applies to all residential gas water heaters, you may see that there is no water., such as rubber gloves and shoes went out ) on your own the... Home that provides electrical power to the water and keeps it in your water ’. The necessary safety equipment, such as rubber gloves and shoes the AmazonSupply logo are trademarks of,.