Gas Water Heater Thermocouple Replacement

First shut off the gas valve on the water heater and the gas valve on the gas line near the heater.

Gas water heater thermocouple replacement.

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. Once the pilot supply tube burner supply tube and thermocouple are disconnected from the gas control valve see above simply lift and remove the burner assembly from the bottom of the water heater. A new one costs about 5 to 10 and is easy to install. For example sid harvey s dyna couple universal mounting thermocouple sold in lengths from 18 to 48 will replace honeywell robertshaw penn baso white rodgers and other thermocouples.

Step 8 reattach the manifold tube pilot tube and thermocouple to the gas control valve thermostat and tighten them using the adjustable wrench. Make sure that the gas controller is in the off position before attempting this repair. Unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. Then detach the thermocouple from the burner and take it with you to the home center or hardware store to ensure you buy the right replacement.

Turn off the gas supply. How to replace a gas water heater thermocouple with video instructions turn off the gas supply to the water heater by using the gas control valve or the main valve. If the thermocouple is working you should be able to measure 30 to 40 millivolts of voltage at the connection end of the tube when the pilot flame is on. If your pilot light won t stay lit the thermocouple probably needs to be replaced.

Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. Honeywell home cq100a1005 u cq100a1005 replacement thermocouple for gas furnaces boilers and water heaters 36 inch 4 7 out of 5 stars 188 9 79 honeywell cq100a1021 u cq100a1021 replacement thermocouple for gas furnaces boilers and water heaters 18. A gas water heater in boise baton rouge buffalo or boston uses a thermocouple that includes a probe attached to a copper tube that screws into a port on the gas valve. The thermocouple has two ends.