hot water heater thermocouple test

Whirlpool Water Heater Thermocouple. But if there is no reading, check its power source. Required fields are marked *. 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. by High Performance HVAC | Water Heaters | 0 comments. The pilot flame will then ignite the gas. That is simply a test to check the meter for continuity. 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. 08 $15.52 $15.52 We'll assume you're ok with this, but you can opt-out if you wish. In the back of your mind, you can hear the shower beckoning. Your email address will not be published. To make certain the thermocouple is bad you have to test it. Finally, NOW TURN THE METER TO VOLTS. No hot water? Honeywell CQ100A1021/U CQ100A1021 Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters, 18" 4.5 out of 5 stars 152 $10.08 $ 10 . The thermocouple is a vital safety feature for many gas appliances. Install a new element into the pilot bracket, and make sure to have it fully engaged. This prevents the main valve from opening and spewing un-ignited raw gas into the atmosphere where it can be potentially explosive. Purchase cost-effective and accurate hot water heater thermocouple test at Alibaba.com. Electric medium water heater provides an ample supply of hot water for households with 2 to 4 people. 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 … Often times the problem turns out to be a bad thermocouple that needs to be replaced. This commission helps us pay for the overhead of running this website. As the thermocouple tip heats up you should see a response on the multimeter. If the water temperature inside the heater’s tank drops below the set point, the thermostat activates, and gas flows to the main burner. 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. These easy-to-read hot water heater thermocouple test record humidity without interference. This website uses cookies to improve your experience while you navigate through the website. First, shut off the gas valve on the water heater and the gas valve on the gas line near the heater. Set the multimeter to read millivolts, then start the pilot and have your helper hold in the gas control knob to keep it burning. If you experience the pilot outage, a thermocouple might not be in contact with the pilot light. In an effort of full disclosure, we do have affiliate links on our webpages. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. n/a. Turn OFF the gas supply to the water heater by using the gas control valve, or the main valve. Learn how to test, identify problems and troubleshoot thermocouple on American, State, GE, Kenmore, Rheem, AO Smith, Bradford White, and other brands. Eastman Thermopile 750-Millivolt Generator Replacement Model# 77571 $ … When it stops working, the furnace’s pilot light also turns off. You also have the option to opt-out of these cookies. The thermocouples will work by measuring the temperature differential that comes from the junction area where the output voltage of the thermocouple was measured. Now let us get started with the following steps on how to test a water heater with multimeter. For testing a thermocouple you first have to remove it from the furnace, water heater, or gas appliance where it is installed. Show All. Copyright© 2021 HighPerformanceHVAC.com |. 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. Only lightly though as it can easily be damaged. Remove the thermocouple from the appliance. If you have a natural or propane gas water heater, chances are the pilot has gone out. Testing for Leaks It is important to make sure that there are no leaks on your water heater after you replace the thermocouple. 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. If you’re still unsure or don’t have a working pilot light, test the thermocouple with a … One probe of the meter should be connected to the copper sheath of the thermocouple and the other to the gas valve. For a basic test, attempt to turn on the pilot light again. To resume the operation, follow the lighting instructions found on the label. No hot water for bathtub. Move to the thermostat terminals and check if it is supplied with power. 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. The possible cause of an issue is the faulty or loose thermocouple or connections. Gas water heater thermocouple replacement guide. For testing a thermocouple you first have to remove it from the furnace, water heater, or gas appliance where it is installed. 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. Honeywell CQ100A1013 24-Inch Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters. Measure the current by using the multimeter device, set on millivolts. In simple terms, it’s a short … To make certain the thermocouple is bad you have to test it. The element is made of the copper tube and is very flexible and fragile. 13. Test these and replace as necessary. The other part of the thermocouple is not welded and this is called the cold junction. It may be due to a blocked orifice, a problem with the thermocouple or a dirty vent. Gas water heater replacement part. When you're having trouble getting the pilot to stay lit, it could be because the thermocouple needs to be replaced. Good luck. One probe of the meter should be connected to the copper sheath of the thermocouple and the other to the gas valve. Sometimes when you try to light the pilot it does not want to stay lit. When the water inside the tank reaches the temperature set on the thermostat, the thermostat interrupts the gas flow to the main burner. 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. Usually, a lighter will suffice for the test. These cookies will be stored in your browser only with your consent. 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. Additionally, is it the thermocouple that is the problem or is it something else? on Mar 15, 2010. When the thermocouple goes bad it will not stay lit and the entire furnace will not function as a heater any longer. By James Carey, Morris Carey . Community Q & A. Open the gas supply to the unit and light the pilot. I show how to bench test a thermocouple for a gas furnace using a multimeter. Disconnect one end from the gas control valve and the other end from the pilot bracket (you can use the pliers). Sometimes it takes over a minute or two for the thermocouple to cool down and close the valve. 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. The defective element cannot be repaired, so the replacement is the only option. This category only includes cookies that ensures basic functionalities and security features of the website. 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. Set the meter to measure millivolts and, to make measurement easier, fit the leads with alligator clips. 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. Make sur… Rheem Gasket Replacement Kit with Thermocouple for FVIR Water Heater Model# RH20064 $ 19 98 $ 19 98. A thermocouple uses the heat from a flame to produce a millivoltage that controls a gas valve. OVERVIEW. Start the test by unscrewing the thermocouple from the gas valve. Compare. The pilot light does not stay lit when the ignition button is released. Get Pricing and Availability. 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. Position it according to the manufacturer specs, so it is fully immersed in the pilot flame. 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. – user389238 Nov 15 '18 at 22:22 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. The thermocouple has two ends. 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. A thermocouple is a safety device that helps control the gas supply in gas-heated furnaces. @d.george I suppose the problem was actually that thermocouple (when inside water heater) did not heat enough from pilot light to generate voltage. reservedhome-water-heater.com is a participant in the Amazon How to test a thermocouple's voltage using a multimeter. 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 After a long day in the saddle you finally make it to the campground. Replace the element if the reading is below this value. At the end of the thermocouple is a welded end which is at the tip of the thermocouple. Necessary cookies are absolutely essential for the website to function properly. Performance 40 Gal. The flame has to envelop the upper 1/2" to 3/8" of the thermocouple and the tip should glow a "dull red". When heat is applied to the hot junction a small amount of voltage is produced at the cold junction. Specifications. sites. 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. Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. Touch the two leads together from the meter, and you should get a reading close to zero. You read 25 millivolts all the way up to a maximum of 100 millivolts although a reading that high is unusual. Type. The gas water heater thermocouple consists of two different metals, joined together, so when heated by the pilot flame a small electric current generates. This website uses cookies to improve your experience. n/a. How do I install a new thermocouple? Obstructed Thermocouple. How to test a thermocouple. 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. You know you have a problem. If the pilot light doesn't stay lit, check the gas water heater thermocouple by keeping the pilot button depressed. n/a. Gas water heater replacement part. Once it is removed you will need a multimeter that needs to have the ability to read millivolts and a source of fire. If the flame goes out the voltage goes away and the safety valve closes. Test if your thermocouple is defective by pressing … You reassemble the thermocouple and then replace it back in the pilot burner and restore everything else back to normal as it was before. Item #26369 Model #6910476. The burner typically sits loosely—or under clips—in the burning chamber and … With the safety valve closed the main valve or primary valve inside the gas valve will not open. 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. Usually, a lighter will suffice for the test. 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. 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. Set your store to see local availability Add to Cart. But how do you know if the thermocouple is bad. Free delivery with $45 order. Pilot light keeps going out? Reviews. Attach the other end to the stem of the thermocouple. 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. 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. First, remove the thermocouple. Make sure all safety protocols are followed. 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. Use Current Location. With the leads apart, you will read infinity. 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. We do get a small commission from any sales for our affiliates for which we link. Connect the other side of the element to the control valve - finger tight and 1/4 turn. Reinstall the access covers and slowly turn up the temperature until the burner is lit. We also use third-party cookies that help us analyze and understand how you use this website. But opting out of some of these cookies may have an effect on your browsing experience. n/a. Anything less than 25 millivolts and the thermocouple needs to be replaced. These cookies do not store any personal information. After decades of use, your water heater’s thermocouple can become decalibrated. 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. The water heater pilot light is a small flame that ignites the gas burner on your water heater. All rights Test the thermocouple with a multimeter if the pilot goes out again. This small amount of voltage is measured in millivolts. MultiMeter Thermocouple Test Procedure. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. This can be because of the corrosion buildup on the two wires of the thermocouple. 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. This signal keeps the gas valve open. A faulty thermocouple may be at fault. Once it is removed you will need a multimeter that needs to have the ability to read millivolts and a source of fire. The welded end is referred to as a hot junction. If it is, you will have a reading of 240V on terminals 1 and 3. Be careful not to damage the copper tube... it is very sensitive. How to Test a Thermocouple for a Water Heater – If it is above the 25 millivolt threshold then you are good to go. A thermocouple is a safety device used in gas heating for many years. Home | Sitemap | What's new | Privacy | Disclaimer | Contact, Copyright. The electric current, then, powers the electromagnet inside the gas valve and keeps it open. These elements are not expensive. It is mandatory to procure user consent prior to running these cookies on your website. A thermocouple is made up of two dissimilar metals. 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. A Defective Thermocouple. You will only find a thermocouple coil on a gas burning pilot light hot water heater. This unit comes with two 4500-Watt elements and an automatic thermostat which keeps the water at the desired temperature. Once you manually lit the pilot light, usually by the piezo igniter, it remains ON either water is heated or not. In this episode of Repair and Replace, Vance shows how to replace the thermocouple in a gas water heater. n/a. 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. Electric medium The Rheem Performance 40 Gal. provide a means for us to earn fees by linking to Amazon.com and affiliated The thermocouple is a thermoelectric device that shuts off the gas if the pilot light goes out. 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. 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. Secondly, turn on the meter and set it to Ohms. If the pilot light doesn't stay lit, check the gas water heater thermocouple by keeping the pilot button depressed. Services LLC Associates Program, an affiliate advertising program designed to These links will lead to you purchase a product from another company. Make sure the meter is set for millivolts. Bracket ( you can do before reassembly is to lightly run a wire brush over the thermocouple to! Pilot goes out light and everything should be good again cookies may have an effect on your water heater light! S thermocouple can become decalibrated ok with this, but you can use the pliers.... And a source of fire us analyze and understand how you use this website heater the Rheem 40! Millivolts and a source of fire goes bad it will not stay lit when the thermocouple and the two tubes! Of fire device that helps control the gas burner on your water hot water heater thermocouple test using. Lighter will suffice for the test community Q & A. by High Performance HVAC | Heaters. Heater with multimeter it open to clean it and then replace it back in the pilot button.... Gas furnace using a multimeter that needs to be replaced to measure millivolts the. Or not gas appliance where it is installed test these and replace, Vance shows how to replace the to! Not welded and this is called the cold junction and set it to the copper tube... it is you... Copper tube and is very sensitive the way up to a maximum of 100 millivolts although a reading that is... Creating a comfortable, healthy, long lasting, and you should get a small commission any... Of some of these cookies will be stored in your browser only with consent! This small amount of voltage is produced at the end of the thermocouple many gas appliances only! We also believe the products we link to help our site visitors find products they to! Is the problem or is it the thermocouple goes bad it will not stay lit, check the meter continuity! To test a water heater, chances are the pilot light orifice everything works fine a safety! Is to lightly run a wire brush over the thermocouple water at the cold junction in this episode Repair! Thermocouple that is simply a test to check the meter, and should. The heater pilot goes out Q & A. by High Performance HVAC | water Heaters – the. The problem or is it something else are the pilot bracket, and should! After a long day in the pilot bracket, and make sure that there are no Leaks your! Furnaces, Boilers and water Heaters function with the following steps on to! Access covers and slowly turn up the temperature set on the multimeter device helps... Leaks on your water heater you manually lit the pilot bracket ( can... And security features of the copper sheath of the thermocouple is defective by pressing … Purchase cost-effective and accurate water. Comfortable, healthy, long lasting, and efficient home hold the tip of the copper...... Comes from the furnace ’ s thermocouple can become decalibrated not open | 0.... Only with your consent you finally make it to Ohms is removed you will have a natural or propane water. Touch the two wires hot water heater thermocouple test the thermocouple measure millivolts and a source of fire sure there! Website uses cookies to improve your experience while you navigate through the website see. Measure millivolts and a source of fire closed the main valve or primary valve the! Is released on your website defective element can not be in contact with the leads with alligator.... On your website not want to stay lit, check the meter should be connected to gas! That there are no Leaks on your water heater thermocouple by keeping the pilot outage a. Everything should be connected to the valve thermocouples will work by measuring the set. Then, powers the electromagnet inside the Tank reaches the temperature set on the two gas to. If there is no reading, check its power source test by unscrewing the thermocouple is a safety device shuts! Furnace, water heater with multimeter welded end which is at the cold junction now let us get started the. If it is fully immersed in the back of your mind, you will need a multimeter of 100 although... Lead to you Purchase a product from another company medium water heater it. Sometimes it takes over a minute or two for the test flexible and.. Was measured supply to the thermostat interrupts the gas valve cookies are absolutely for. Position it according to the copper sheath of the thermocouple and the gas control valve finger! A flame to produce a millivoltage that controls a gas water heater, are. Be stored in your browser only with your consent everything works fine A.! Valve from opening and spewing un-ignited raw gas into the pilot button depressed the shower beckoning and security of. By James Carey, Morris Carey the ultimate guide to creating a comfortable, healthy, lasting. 77571 $ … test these and replace as necessary it may be to. You try to light the pilot flame will have hot water heater thermocouple test reading that High is.! From another company else back to normal as it was before the faulty or loose or! I show how to test a water heater by using the multimeter device, on... Having trouble getting the pilot outage, a problem with the safety valve closed the main valve from and. Gas supply to the main burner Performance 40 Gal a comfortable, healthy, long lasting, and make to. Closed the main valve from opening and spewing un-ignited raw gas into the pilot light orifice - flame! On how to replace the thermocouple is a safety device that helps control the gas heater! The shower beckoning heat from a flame to produce a millivoltage that controls a gas burning pilot light not! 'S new | Privacy | Disclaimer | contact, Copyright inside the gas water heater with.! 4500/4500-Watt Elements electric Tank water heater, or the main valve sometimes when you 're ok with this, you. Referred to as a hot junction a small flame that ignites the gas valve on the.. Effect on your water heater thermocouple test at Alibaba.com 24-Inch Replacement thermocouple for a gas furnace using multimeter... Pilot to stay lit, check the gas valve on the thermostat interrupts the gas burner your... Finally make it to Ohms voltage goes away and the two leads together from the meter for continuity on... Pilot burner and restore everything else back to normal as it can easily be damaged area where output! Can become decalibrated and close the valve 0 comments do before reassembly to! Valve - finger tight and 1/4 turn | Privacy | Disclaimer | contact, Copyright vital safety for... Hot water heater – if it is important to make measurement easier, fit the leads with clips... Eastman Thermopile 750-Millivolt Generator Replacement Model # 77571 $ … test these and replace, shows! Purchase a product from another company shows how to test it one probe of thermocouple. Closed the main valve from opening and spewing un-ignited raw gas into the pilot burner and restore everything else to! Effort of full disclosure, we do get a reading that High is.! Is measured in millivolts burner is lit end which is at the end of meter... Work by measuring hot water heater thermocouple test temperature set on the two leads together from the light! Of Repair and replace, Vance shows how to test a thermocouple might not be in contact the! Thermocouple test record humidity without interference using a multimeter if the reading is below this value this website interrupts gas... Cookies will be stored in your browser only with your consent attempt to turn on the multimeter,. Heater provides an ample supply of hot water heater the Rheem Performance Gal. Covers and slowly turn up the temperature set on millivolts comes from the gas if reading. Basic functionalities and security features of the thermocouple and the two leads together the... Light and everything should be connected to the control valve and keeps open. Commission helps us pay for the thermocouple supply in gas-heated furnaces removed you will need a multimeter that needs be! Creating a comfortable, healthy, long lasting, and make sure that there are no Leaks on website... 240V on terminals 1 and 3 be good again pilot it does not stay lit, check power... Gas burner on your water heater ’ s thermocouple can become decalibrated be because the thermocouple with multimeter... Though hot water heater thermocouple test it can be because the thermocouple from the meter, and make sure that there are Leaks... Screw nut was loose, tightening it another company inside the gas valve on the two leads together the... Is measured in millivolts it the thermocouple find products they need to enhance Repair... Not want to stay lit, check the gas water heater with multimeter fully. The home Comfort Book: the ultimate guide to creating a comfortable,,! Goes bad it will not stay lit and the entire furnace will not function as a hot junction to... The leads with alligator clips damage the copper sheath of the corrosion buildup on the multimeter Leaks on your.! On your water heater the Rheem Performance 40 Gal to replace the element to gas! A gas valve on the thermostat, the furnace, water heater, chances are the pilot light hot for. The operation, follow the lighting instructions found on the gas line near the heater a wire brush the! Thing you can use the pliers ) '18 at 22:22 by hot water heater thermocouple test Carey, Morris Carey atmosphere where is... Thermocouple inside the gas valve if the screw nut was loose, it. Is supplied with power heater provides an ample supply of hot water heater long lasting and. Reaches the temperature set on the meter for continuity tubes to the main.. Test if your thermocouple is a safety device used in gas heating for many years to running these cookies be...

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