When the pilot light on a gas water heater won’t stay lit, the problem is usually a faulty thermocouple. The thermocouple is a heat sensitive device that sends an electrical signal to the gas valve to keep the pilot valve open when the pilot is on..The type of ignition system you have in your water heater will determine how you replace the thermocouple. With both types of ignitionstanding pilot or electronicthe thermocouple is part of the burnerembly. With a standing pilot, there is just a pilot and thermocouple attached to the burnerembly..Detach the thermocouple from the burner. The thermocouple is usually attached to the pilot gas supply with one or more clips that snap into place. The end of the thermocouple is inserted into the pilotembly and can simply be pulled out. Take the detached thermocouple with you to the home center or hardware store and buy a new one..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..In some water tanks it is possible to pull out the old thermocouple without removing the whole burnerembly. In this case, just unthe old thermocouple from the gas control, and pull the thermocouple out of thecket that holds it in the burner..Install the burner unit back into the water heater. The gas burner supply, pilot supply, and thermocouple connectors need to beened. When you areening the thermocouple, make sure to not turn more than turn past finger. Step Test Water Heater and Finish. Turn on the gas valves. To check for leaks in the valves put some soapy water on the connections..
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 for years to come. Learn how to replace this inexpensive part and keep your .