Learn how to replace a gas water heater thermocouple or flame sensor on olders with standing pilot as well as newer electronic ignitions..A water heater that doesn’t heat might just need a new thermocouple. Learn how to replace this inexpensive part and keep your water heater working f.If you have a gas water heater with a pilot light that won’t stay lit, it’s probably due to a failed thermocouple. The thermocouple is a thermoelectric device .Gas water heater thermocouple replacement guide. Learn how to replace a thermocouple in several easy steps on American, State, GE, Kenmore, Rheem, AO Smith,dford .
First shut off the gas valve on the water heater and the gas valve on the gas line near the heater. Then unfasten the three nuts that hold the thermocouple and the two gto the valve. The burner typi.y sits looselyor under clipsin the burning chamber and just slides out..