My Hot Water Heater Has a Bad Thermocouple

Operation

• A thermocouple responds to the heat created by the gas igniter and sends a signal to the gas valve, allowing it to function. If the igniter is not working, or the thermocouple fails, the gas valve will not receive the signal and remain closed, which prevents the heater from leaking gas into the home.

Removal

• A thermocouple endures constant exposure to high temperatures, which will eventually cause it to fail. Thus, easy replacement is part of its design. Shut off the gas and electricity to the heater, release the thermocouple from the metal clip holding it near the igniter or pilot light and unscrew the nut holding it to the main gas valve.

Installation

• To install a new thermocouple, insert one end into the metal clip near the igniter or pilot light and insert the other end into its socket on the gas valve and tighten the nut holding it in place. Turn on the electricity and gas and light the pilot light if it's so equipped.