These cookies will be stored in your browser only with your consent. One probe of the meter should be connected to the copper sheath of the thermocouple and the other to the gas valve. n/a. A Defective 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. With the safety valve closed the main valve or primary valve inside the gas valve will not open. The element is made of the copper tube and is very flexible and fragile. After cleaning the pilot light orifice everything works fine. 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. Whirlpool Water Heater Thermocouple. Once it is removed you will need a multimeter that needs to have the ability to read millivolts and a source of fire. 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Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Your email address will not be published. Necessary cookies are absolutely essential for the website to function properly. Measure the current by using the multimeter device, set on millivolts. How to test a thermocouple's voltage using a multimeter. Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. In simple terms, it’s a short … Learn how to test, identify problems and troubleshoot thermocouple on American, State, GE, Kenmore, Rheem, AO Smith, Bradford White, and other brands. Reinstall the access covers and slowly turn up the temperature until the burner is lit. Item #26369 Model #6910476. If the pilot light doesn't stay lit, check the gas water heater thermocouple by keeping the pilot button depressed. This small amount of voltage is measured in millivolts. That is simply a test to check the meter for continuity. First, shut off the gas valve on the water heater and the gas valve on the gas line near the heater. This website uses cookies to improve your experience while you navigate through the website. Services LLC Associates Program, an affiliate advertising program designed to 1. Honeywell CQ100A1021/U CQ100A1021 Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters, 18" 4.5 out of 5 stars 152 $10.08 $ 10 . If you have a gas water heater with a pilot light that won’t stay lit, it’s probably due to a failed thermocouple. Your email address will not be published. by High Performance HVAC | Water Heaters | 0 comments. The pilot flame will then ignite the gas. 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. As the thermocouple tip heats up you should see a response on the multimeter. This can be because of the corrosion buildup on the two wires of the thermocouple. The water heater pilot light is a small flame that ignites the gas burner on your water heater. If the flame goes out the voltage goes away and the safety valve closes. The possible cause of an issue is the faulty or loose thermocouple or connections. The welded end is referred to as a hot junction. When heat is applied to the hot junction a small amount of voltage is produced at the cold junction. Use Current Location. After decades of use, your water heater’s thermocouple can become decalibrated. Community Q & A. Testing for Leaks It is important to make sure that there are no leaks on your water heater after you replace the thermocouple. 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. 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. Make sur… 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 … Obstructed Thermocouple. Open the gas supply to the unit and light the pilot. sites. A faulty thermocouple may be at fault. By James Carey, Morris Carey . MultiMeter Thermocouple Test Procedure. Test if your thermocouple is defective by pressing … Usually, a lighter will suffice for the test. Set the multimeter to read millivolts, then start the pilot and have your helper hold in the gas control knob to keep it burning. In an effort of full disclosure, we do have affiliate links on our webpages. In the back of your mind, you can hear the shower beckoning. You read 25 millivolts all the way up to a maximum of 100 millivolts although a reading that high is unusual. 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. Rheem Gasket Replacement Kit with Thermocouple for FVIR Water Heater Model# RH20064 $ 19 98 $ 19 98. In this episode of Repair and Replace, Vance shows how to replace the thermocouple in a gas water heater. 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. If it is, you will have a reading of 240V on terminals 1 and 3. 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. Performance 40 Gal. One probe of the meter should be connected to the copper sheath of the thermocouple and the other to the gas valve. These cookies do not store any personal information. When you're having trouble getting the pilot to stay lit, it could be because the thermocouple needs to be replaced. Test the thermocouple with a multimeter if the pilot goes out again. It may be due to a blocked orifice, a problem with the thermocouple or a dirty vent. After a long day in the saddle you finally make it to the campground. 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. A thermocouple is a safety device that helps control the gas supply in gas-heated furnaces. n/a. 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