We recommend our users to update the browser. Rather than trying to unfasten the thermocouple inside the water heater’s burning chamber, it’s easier to remove the whole burner and thermocouple assembly. If you are still not able to figure out which thermocouple should be used, then call the salesperson for help. The No. Use soapy water on the joints to test for gas leaks. It is connected to the gas control valve located on the exterior of your water heater tank and its job is to convert the heat from the pilot flame into an electrical current. Second the burners you mention is the pilot light? THERMOCOUPLE REPLACEMENT INSTRUCTIONS - NATURAL GAS MODELS (ALL MODELS EXCEPT 30T) Figure 1 Manifold Door Manifold Door Screws Outer Door Mark Gas Control Knob Lock Tab Igniter Wire Pilot Tube Thermocouple Manifold Tube 6510344 February 2005 Kit Contents: 1 Thermocouple and 1 Thermocouple Clip IMPORTANT: For correct water heater operation, it is essential that the thermocouple … Turn OFF the gas supply to the water heater by using the gas control valve, or the main valve. Find gas main cut-off valve on the pipe. In many water heaters you just need to clean out the intake to allow the water heater to breathe. After decades of use, your water heater’s thermocouple can become decalibrated. Thank you for your time. 1 cause of pilot lights that won’t stay lit is a worn-out thermocouple. It’s easy to replace and a new one costs $5 to $10. 1 cause of pilot lights that won’t stay lit is a worn-out thermocouple. How to replace a thermocouple. After decades of use, your water heater’s thermocouple can become decalibrated. Turn the knob clockwise to the off position. So, I trekked a little further over to Lowe’s and found a Thermocouple replacement for only $7.84. Replace thermostat and/or heating element: $150–$200. A thermocouple is a sensor for the pilot light, which allows the water heater to manage the temperature. A Defective Thermocouple. Turn the gas supply back on. Remove the old thermocouple from the bracket. Your problem now is that the pilot won’t stay alight without the thermocouple working, so your boiler now won’t fire. Replace the two-piece wire connector onto the thermocouple and igniter wire, securing it with the retainer clip, and slide the manifold burner assembly back into the water heater. Step 8 Reattach the manifold tube, pilot tube and thermocouple to the gas control valve/thermostat and tighten them using the adjustable wrench. Remove the shields from the access area of the water heater. Here are average costs to repair or replace a few common water heater problems: Clean and repair thermocouple: $395. Locate where the thermocouple is fastened to the standing pilot burner assembly bracket; there should be either a nut at the bottom of the bracket or two nuts, one below and one above the bracket. Even though this procedure is very simple, it is still difficult to do without any precautionary measures. Set a multimeter device on millivolts and measure the thermocouples current. Install a new one and test for gas leaks… Slide the thermocouple out of position.This will disconnect it on both ends. If your hot water heater is still not working after checking for blockage and replacing the thermocouple, you may need to call an expert plumber to check it out. In other cases a bad gas valve can be at fault and is often blamed on the thermocouple. To get the thermocouple out, you need to loosen and remove the nuts with the wrench that are connected to the 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. The thermocouple is a thermoelectric device that shuts off the gas if the pilot light goes out. A good rule of thumb is that water heater’s life expectancy is 9 years. (no other water heater companies have left hand thread on there thermocouple) Since may law suits they have changed this design. It is also possible you have a blockage in the tiny tube that supplies gas to the pilot. Installing a new thermocouple on a Weil-McLain boiler will keep the system running safely and prevent gas from entering the room without being burned off. Unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. x 4-in. Be careful not to damage the copper tube... it is very sensitive. 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