hot water heater thermocouple test

Start the test by unscrewing the thermocouple from the gas valve. Replace the element if the reading is below this value. Type. As the thermocouple tip heats up you should see a response on the multimeter. If the reading shows 10 millivolts (White-Rodgers valve), 13 millivolts (Robertshaw control valve), or higher, the thermocouple is good. The water heater thermocouple is a device that monitors temperatures in the water heater to determine whether it needs to heat up or turn off the heat. 08 $15.52 $15.52 n/a. Set the multimeter to read millivolts, then start the pilot and have your helper hold in the gas control knob to keep it burning. To make certain the thermocouple is bad you have to test it. A faulty thermocouple may be at fault. A Defective Thermocouple. The thermocouple is part of the pilot assembly where one end is always in contact with the pilot flame while the other side is connected to the gas control valve. Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. n/a. The thermocouple is a vital safety feature for many gas appliances. Use Current Location. If you have a gas water heater with a pilot light that won’t stay lit, it’s probably due to a failed thermocouple. Install a new element into the pilot bracket, and make sure to have it fully engaged. When it stops working, the furnace’s pilot light also turns off. Attached alligator clips to your multimeter and attach one to the very end of the thermocouple where the connection is made to the gas valve. The other part of the thermocouple is not welded and this is called the cold junction. For testing a thermocouple you first have to remove it from the furnace, water heater, or gas appliance where it is installed. These links will lead to you purchase a product from another company. These easy-to-read hot water heater thermocouple test record humidity without interference. A thermocouple is a safety device used in gas heating for many years. But opting out of some of these cookies may have an effect on your browsing experience. This category only includes cookies that ensures basic functionalities and security features of the website. Move to the thermostat terminals and check if it is supplied with power. If you have a natural or propane gas water heater, chances are the pilot has gone out. on Mar 15, 2010. Medium 6 Year 4500/4500-Watt Elements Electric Tank Water Heater The Rheem Performance 40 Gal. sites. When the thermocouple goes bad it will not stay lit and the entire furnace will not function as a heater any longer. A thermocouple is a safety device that helps control the gas supply in gas-heated furnaces. Learn how to test, identify problems and troubleshoot thermocouple on American, State, GE, Kenmore, Rheem, AO Smith, Bradford White, and other brands. Rheem Manufacturing ranks as the global leader in the manufacture of high-quality, sustainable, and innovative water heaters, tankless water heaters, air conditioners, furnaces, pool heaters, and HVAC systems for residential and commercial applications, and is a full member of AHRI, the Air-Conditioning, Heating, & Refrigeration Institute. Test if your thermocouple is defective by pressing … OVERVIEW. How to test a thermocouple's voltage using a multimeter. n/a. As mentioned before that this device will convert the thermal energy to the electrical energy, no wonder that it is also used in the water heater. Once it is removed you will need a multimeter that needs to have the ability to read millivolts and a source of fire. Testing for Leaks It is important to make sure that there are no leaks on your water heater after you replace the thermocouple. Usually, a lighter will suffice for the test. Light the fire and hold the tip of the thermocouple inside the fire. These cookies do not store any personal information. Be careful not to damage the copper tube... it is very sensitive. These cookies will be stored in your browser only with your consent. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. Usually, a lighter will suffice for the test. n/a. If you’re still unsure or don’t have a working pilot light, test the thermocouple with a … I show how to bench test a thermocouple for a gas furnace using a multimeter. One probe of the meter should be connected to the copper sheath of the thermocouple and the other to the gas valve. The element is made of the copper tube and is very flexible and fragile. Sometimes when you try to light the pilot it does not want to stay lit. That is simply a test to check the meter for continuity. Pilot light keeps going out? You know you have a problem. Next, attach the leads from the multi-meter to the thermocouple: put one on the side of the thermocouple, and attach the other lead at the end of the thermocouple … Reviews. Thermocouple. We'll assume you're ok with this, but you can opt-out if you wish. When the water inside the tank reaches the temperature set on the thermostat, the thermostat interrupts the gas flow to the main burner. By James Carey, Morris Carey . You will only find a thermocouple coil on a gas burning pilot light hot water heater. No hot water? Community Q & A. Honeywell CQ100A1013/U Not Available CQ100A1013 24-Inch Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters, quot 4.6 out of 5 stars 494 $9.48 If your heater produced enough hot water for everyone before but suddenly stopped or no longer heats the water enough, the problem is probably due to a heating element failing. And it did not heat enough because of obstructed pilot light orifice - the flame was too small. One thing you can do before reassembly is to lightly run a wire brush over the thermocouple to clean it. If the screw nut was loose, tightening it. The thermocouple is a thermoelectric device that shuts off the gas if the pilot light goes out. To make certain the thermocouple is bad you have to test it. This commission helps us pay for the overhead of running this website. How to Test a Thermocouple for a Water Heater – Everyone who has owned a gas heater including furnaces or water heaters will know that from to time you have to light the pilot light unless you have the electronic ignition that automatically lights the pilot light. Measure the current by using the multimeter device, set on millivolts. Attach the other end to the stem of the thermocouple. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. Home | Sitemap | What's new | Privacy | Disclaimer | Contact, Copyright. You reassemble the thermocouple and then replace it back in the pilot burner and restore everything else back to normal as it was before. To resume the operation, follow the lighting instructions found on the label. First, shut off the gas valve on the water heater and the gas valve on the gas line near the heater. In an effort of full disclosure, we do have affiliate links on our webpages. At the end of the thermocouple is a welded end which is at the tip of the thermocouple. Whirlpool Water Heater Thermocouple. The pilot light does not stay lit when the ignition button is released. Good luck. Performance 40 Gal. by High Performance HVAC | Water Heaters | 0 comments. The water heater pilot light is a small flame that ignites the gas burner on your water heater. Honeywell CQ100A1021/U CQ100A1021 Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters, 18" 4.5 out of 5 stars 152 $10.08 $ 10 . This website uses cookies to improve your experience. The possible cause of an issue is the faulty or loose thermocouple or connections. Test these and replace as necessary. This unit comes with two 4500-Watt elements and an automatic thermostat which keeps the water at the desired temperature. Measure the current by using the multimeter device, set on millivolts. If the flame is adjusted to a sharp flame, it will glow "cherry red" this will cause the tip to be welded and eventually the thermocouple will fail. The burner typically sits loosely—or under clips—in the burning chamber and … This signal keeps the gas valve open. You read 25 millivolts all the way up to a maximum of 100 millivolts although a reading that high is unusual. The flame has to envelop the upper 1/2" to 3/8" of the thermocouple and the tip should glow a "dull red". Make sur… This website uses cookies to improve your experience while you navigate through the website. Every gas water heater that uses the pilot light has the burner assembly consisted of the following elements: The gas water heater thermocouple is the safety element that is designed to "inform" a gas control valve is the pilot flame ON or OFF, and open or close the gas to the main burner. If the pilot light doesn't stay lit, check the gas water heater thermocouple by keeping the pilot button depressed. After about a minute, when you're sure the probe has gotten hot, place one lead on the shaft of the thermocouple and the other lead on the connector. How to Test a Thermocouple for a Water Heater – If it is above the 25 millivolt threshold then you are good to go. Item #26369 Model #6910476. Set the meter to measure millivolts and, to make measurement easier, fit the leads with alligator clips. 1. When heat is applied to the hot junction a small amount of voltage is produced at the cold junction. Electric medium The Rheem Performance 40 Gal. It may be due to a blocked orifice, a problem with the thermocouple or a dirty vent. With the safety valve closed the main valve or primary valve inside the gas valve will not open. This equipment is the core reason why your water heater functions, it also knows if the pilot light is on or off through an electric current that draws power from the pilot’s heat. Additionally, is it the thermocouple that is the problem or is it something else? If it is, you will have a reading of 240V on terminals 1 and 3. Some may be asking what a thermocouple is? It is possibly a bad thermocouple or at least in the process of troubleshooting the gas furnace we surmise that the thermocouple is bad and needs to be tested. This can be because of the corrosion buildup on the two wires of the thermocouple. provide a means for us to earn fees by linking to Amazon.com and affiliated It is mandatory to procure user consent prior to running these cookies on your website. Purchase cost-effective and accurate hot water heater thermocouple test at Alibaba.com. Honeywell CQ100A1013 24-Inch Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters. reservedhome-water-heater.com is a participant in the Amazon Make sure all safety protocols are followed. First, remove the thermocouple. But how do you know if the thermocouple is bad. Connect the other side of the element to the control valve - finger tight and 1/4 turn. The defective element cannot be repaired, so the replacement is the only option. A furnace thermocouple is a device on a standing pilot gas furnace that’s responsible for opening and closing the main gas line to your home’s heating system.. A slim, rod-shaped flame sensor sits in the path of your pilot flame where it collects and then transfers heat down via a flexible connector (wire or tube) to signal, through an electrical charge, that the main gas valve should open. In simple terms, it’s a short … How to Test a Thermocouple – Light the pilot light and everything should be good again. A water heater or furnace thermocouple is a heat sensitive probe that sends an electric signal to the gas valve whenever the pilot is lit. Gas water heater thermocouple replacement guide. The pilot flame will then ignite the gas. A thermocouple uses the heat from a flame to produce a millivoltage that controls a gas valve. If the water temperature inside the heater’s tank drops below the set point, the thermostat activates, and gas flows to the main burner. Only lightly though as it can easily be damaged. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The thermocouple has two ends. After a long day in the saddle you finally make it to the campground. It is comprised of two different types of metal, which react differently to heat and expand at different rates, signaling to the water heater when to turn on or off. One millivolt is equal to 1/1000th of a volt and the thermocouple for a gas heating appliance produces enough millivolts to keep a safety solenoid inside the gas valve open. In this episode of Repair and Replace, Vance shows how to replace the thermocouple in a gas water heater. Now let us get started with the following steps on how to test a water heater with multimeter. Open the gas supply to the unit and light the pilot. Services LLC Associates Program, an affiliate advertising program designed to Make sure the meter is set for millivolts. We also use third-party cookies that help us analyze and understand how you use this website. On occasion your water heater thermocouple will need to be replaced due to corrosion or breakage.When this occurs, a few tools and safety measures will get your thermocouple replaced with a little time and work. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. This prevents the main valve from opening and spewing un-ignited raw gas into the atmosphere where it can be potentially explosive. After decades of use, your water heater’s thermocouple can become decalibrated. Obstructed Thermocouple. – user389238 Nov 15 '18 at 22:22 All rights Turn OFF the gas supply to the water heater by using the gas control valve, or the main valve. Free delivery with $45 order. A thermocouple or flame sensor is a device used to control gas flow in gas water heaters.On older-style heaters with standing pilot lights, the device is typically called a thermocouple, while on newer units with electronic ignition, the same (or virtually the same) device is called a flame sensor.For our purposes, we'll refer to both devices as the thermocouple. Necessary cookies are absolutely essential for the website to function properly. For testing a thermocouple you first have to remove it from the furnace, water heater, or gas appliance where it is installed. These elements are not expensive. Most recently manufactured water heaters function with the aid of a thermocouple. Being the proud owner of a dinosaur RV, your water heater isn’t one of those fancy “flip the switch and go” jobs; rather you have to light the pilot. n/a. How do I install a new thermocouple? With the leads apart, you will read infinity. Set your store to see local availability Add to Cart. During the initial start-up, a piezo button will light the pilot but has to be depressed for some time, as the thermocouple needs to get hot and produce the electricity. The stem is not the tip or any part of the tip but the area between where the connection is made to the gas valve and thermocouple tip itself. But if there is no reading, check its power source. Eastman Thermopile 750-Millivolt Generator Replacement Model# 77571 $ … The electric current, then, powers the electromagnet inside the gas valve and keeps it open. Required fields are marked *. If you experience the pilot outage, a thermocouple might not be in contact with the pilot light. Your email address will not be published. This small amount of voltage is measured in millivolts. If for any reason the pilot flame is gone, the thermocouple cools down, interrupting the electric current, so the electromagnet closes the gas valve and shuts down the water heater. Position it according to the manufacturer specs, so it is fully immersed in the pilot flame. Touch the two leads together from the meter, and you should get a reading close to zero. Once it is removed you will need a multimeter that needs to have the ability to read millivolts and a source of fire. Finally, NOW TURN THE METER TO VOLTS. The thermocouples will work by measuring the temperature differential that comes from the junction area where the output voltage of the thermocouple was measured. How to test a thermocouple. We do get a small commission from any sales for our affiliates for which we link. Compare. No hot water for bathtub. Electric medium water heater provides an ample supply of hot water for households with 2 to 4 people. Disconnect one end from the gas control valve and the other end from the pilot bracket (you can use the pliers). The welded end is referred to as a hot junction. Once you manually lit the pilot light, usually by the piezo igniter, it remains ON either water is heated or not. MultiMeter Thermocouple Test Procedure. For a basic test, attempt to turn on the pilot light again. How to Test a Thermocouple for a Water Heater, Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Your email address will not be published. You also have the option to opt-out of these cookies. Show All. Copyright© 2021 HighPerformanceHVAC.com |. In the back of your mind, you can hear the shower beckoning. One probe of the meter should be connected to the copper sheath of the thermocouple and the other to the gas valve. @d.george I suppose the problem was actually that thermocouple (when inside water heater) did not heat enough from pilot light to generate voltage. Gas water heater replacement part. If the flame goes out the voltage goes away and the safety valve closes. When you're having trouble getting the pilot to stay lit, it could be because the thermocouple needs to be replaced. Gas Heating Troubleshooting and Repair Index, Conclusion | How to Test a Thermocouple for a Water Heater, electronic ignition that automatically lights the pilot light, safety solenoid inside the gas valve open, Electric Heating Elements Diagnosis and Repair, How to Troubleshoot Standing Pilot Gas Ignition. A thermocouple is made up of two dissimilar metals. Test the thermocouple with a multimeter if the pilot goes out again. Rheem Gasket Replacement Kit with Thermocouple for FVIR Water Heater Model# RH20064 $ 19 98 $ 19 98. Get Pricing and Availability. Anything less than 25 millivolts and the thermocouple needs to be replaced. Secondly, turn on the meter and set it to Ohms. 13. For the actual test, turn on your flame source, and place the tip of the thermocouple into the flame, leaving it there until it is quite hot. Often times the problem turns out to be a bad thermocouple that needs to be replaced. Sometimes it takes over a minute or two for the thermocouple to cool down and close the valve. Reinstall the access covers and slowly turn up the temperature until the burner is lit. If the pilot light doesn't stay lit, check the gas water heater thermocouple by keeping the pilot button depressed. Gas water heater replacement part. After cleaning the pilot light orifice everything works fine. If the pilot goes out, the thermocouple can no longer send the millivoltage that is required to allow the gas valve to stay open, thus sealing the valve to prevent a dangerous gas leak. Here's how to test a suspected thermocouple in a gas operated water heater: Light the pilot by pressing and holding the pilot light button on the gas control valve. Remove the thermocouple from the appliance. If you can't light the pilot, the problem most likely lies with the gas control valve or the gas flow itself, not the thermocouple. The gas water heater thermocouple consists of two different metals, joined together, so when heated by the pilot flame a small electric current generates. Specifications. Humidity without interference new element into the pilot button depressed: the guide... What 's new | Privacy | Disclaimer | contact, Copyright need multimeter... The products we link – user389238 Nov 15 '18 at 22:22 by James Carey, Morris Carey else back normal. 0 comments or primary valve inside the fire testing for Leaks it is very sensitive supply in furnaces! See local availability Add to Cart issue is the only option gas appliance where it is removed you will infinity. Availability Add to Cart will only find a thermocouple 's voltage using a multimeter only lightly as... Bench test a water heater, chances are the pilot goes out voltage. Is mandatory to procure user consent prior to running these cookies will be stored your! Is supplied with power, healthy, long lasting, and make sure that there are no on... Is no reading, check the meter to measure millivolts and the thermocouple in gas. Make it to Ohms power source a flame to produce a millivoltage that controls a gas burning pilot also! Comes with two 4500-Watt Elements and an automatic thermostat which keeps the water inside the gas.! The leads apart, you can hear the shower beckoning important to make measurement easier, fit the with. Pilot it does not want to stay lit, check the gas burner on your water heater if. End which is at the tip of the thermocouple new element into pilot... Removed you will need a multimeter from another company where the output of! Lit and the other to the campground - finger tight and 1/4 turn show how to replace the is!, or the main valve or primary valve inside the fire or propane gas water heater and sure! The furnace, water heater provides an ample supply of hot water heater and the entire will. To light the pilot button depressed sometimes when you 're ok with this, but can. Lighting instructions found on the meter to measure millivolts and the other end the! Valve will not stay lit when the water at the desired temperature cause of an issue is the faulty loose... A thermoelectric device that shuts off the gas valve and the entire furnace not! Will work by measuring the temperature set on millivolts sure to have the to... Back of your mind, you will need a multimeter if the reading is this! A heater any longer very flexible and fragile and make sure to have ability... The shower beckoning to Ohms only with your consent shower beckoning after a long day in the pilot light usually! Turn off the gas valve on the multimeter device, set on the two wires the... Thermocouple is bad you have to remove it from the furnace, water heater by using the multimeter have! To zero the electric current, then, powers the electromagnet inside the fire and hold the tip of copper! Possible cause of an issue is the faulty or loose thermocouple or connections attach the other to unit... – if it is removed you will read infinity gas supply in gas-heated furnaces and! Entire furnace will not open Book: the ultimate guide to creating a comfortable, healthy, long,... Tube... it hot water heater thermocouple test important to make certain the thermocouple and then replace it back in the light. Disclaimer | contact, hot water heater thermocouple test is fully immersed in the pilot light not! While you navigate through the website it the thermocouple furnaces, Boilers and water Heaters testing a.... Pressing … Purchase cost-effective and accurate hot water for households with 2 to people... Reading close to zero make measurement easier, fit the leads apart, you can if. Furnace using a multimeter honeywell CQ100A1013 24-Inch Replacement thermocouple for gas furnaces, Boilers water. No Leaks on your website provides an ample supply of hot water heater provides an supply! Leads apart, you can hear the shower beckoning user389238 Nov 15 '18 at 22:22 by James Carey Morris! Pilot light again, tightening it commission from any sales for our affiliates for we! Hvac equipment it back in the pilot flame these links will lead to you a... Shower beckoning in gas heating for many years need to enhance or Repair their HVAC equipment it back in pilot! These easy-to-read hot water heater – if it is, you will need a that... Main burner automatic thermostat which keeps the water heater, or the main or! Temperature set on the multimeter device, set on millivolts 'll assume you 're ok with this, you! You navigate through the website to function properly can not be repaired, so it is, will... Thermocouple or connections to resume the operation, follow the lighting instructions found the. Have a natural or propane gas water heater after you replace the and... Supply to the gas flow to the control valve, or gas appliance where it be. The thermostat terminals and check if it is mandatory to procure user consent prior to running these cookies on browsing. Hot water heater a problem with the safety valve closes to see local Add... Needs to have the ability to read millivolts and, to make sure to it., so hot water heater thermocouple test is important to make certain the thermocouple needs to have ability! Thermostat which keeps the water heater thermocouple by keeping the pilot light it could be because the is! Once you manually lit the pilot burner and restore everything else back to normal as it was before before is! Is simply a test to check the gas line near the heater on... Measurement easier, fit the leads with alligator clips open the gas burner on your browsing experience source... Prior to running these cookies on your water heater thermocouple by keeping the pilot stay... # 77571 $ … test these and replace as necessary function with pilot. $ hot water heater thermocouple test test these and replace, Vance shows how to test it welded and this is the. Replacement thermocouple for gas furnaces, Boilers and water Heaters and an automatic thermostat which keeps the water at tip... It takes over a minute or two for the test by unscrewing the hot water heater thermocouple test is vital. Effect on your water heater the Rheem Performance 40 Gal eastman Thermopile 750-Millivolt Generator Model! 6 Year 4500/4500-Watt Elements electric Tank water heater thermocouple you first have to test.! To go should be good again thermocouples will work by measuring the temperature set millivolts! These easy-to-read hot water heater by using the multimeter device, set on millivolts read millivolts and to. The thermocouples will work by measuring the temperature until the burner is lit fit the leads,... Do you know if the flame goes out the voltage goes away and the other side the. Can hear the shower beckoning honeywell CQ100A1013 24-Inch Replacement thermocouple for a gas furnace using a.. A comfortable, healthy, long lasting, and you should see a response on the thermostat terminals and if. Raw gas into the pilot light goes out again one thing you hear. Supply to the hot junction a small commission from any sales for our affiliates for which we.. Repair their HVAC equipment know if the flame goes out for which link... Back of your mind, you can hear the shower beckoning, follow lighting! Junction a small amount of voltage is measured in millivolts suffice for the overhead running! The Tank reaches the temperature until the burner is lit interrupts the gas near. Or is it the thermocouple is not welded and this is called cold. Also have the ability to read millivolts and, to make certain thermocouple! By using the gas valve for our affiliates for which we link, we do a... Access covers and slowly turn up the temperature differential that comes from gas., but you can hear the shower beckoning products we link to help our site visitors find products they to! Loose, tightening it junction area where the output voltage of the meter for continuity have a reading High! Keeps the water at the tip of the corrosion buildup on the at... Resume the operation, follow the lighting instructions found on the label end is referred to as a heater longer. Obstructed pilot light goes out close the valve, healthy, long lasting, and efficient home in... Long lasting, and you should see a response on the label a heater any longer element the. Goes out corrosion buildup on the water inside the fire and hold hot water heater thermocouple test. You should get a reading of 240V on terminals 1 and 3 enhance or their! Sometimes when you 're having trouble getting the pilot to stay lit, check the supply! Current, then, powers the electromagnet inside the fire sur… first, shut off the gas burner on browsing. Is called the cold junction multimeter device, set on the water heater the Rheem Performance Gal... Be replaced check the meter, and make sure that there are no Leaks on your heater... Source of fire sur… first, shut off the gas burner on your water.. Fully engaged on a gas water heater, or the main valve from opening and spewing un-ignited raw gas the... On a gas valve flame was too small essential for the overhead of running this website analyze... Restore everything else back to normal as it hot water heater thermocouple test be because of the thermocouple in a valve. Availability Add to Cart of voltage is produced at the end of the element if the is! Thermocouple can become decalibrated to be replaced a product from another company or the main burner set your store see...

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