Replace the thermocouple as follows. Unscrew the nut that holds the thermocouple end fitting into the gas control valve using an.

How To Fix A Water Heater Pilot Light Leak Repair Home Repair

Remove the furnace s access cover.

How to replace a thermocouple. It s easy to replace and a new one costs 5 to 10. Insert new thermocouple into hole in bracket. If the furnace has been running wait 30 minutes for the thermocouple to cool completely.

Since almost all major brands of atmospherically vented water heaters have switched from a thermocouple to a thermopile system here s a step by step. Remove the old thermocouple completely by pulling it through from inside to outside. If your furnace pilot light wont stay lit then it might be an easy fix.

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. Make sure that the gas controller is in the off position before attempting this repair. How to replace a water heater s thermocouple.

Unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. However if you get a result of 25 millivolts or less the thermocouple has malfunctioned and needs to be replaced. Before you do this be sure to turn off the line valve on the gas supply.

Slowly and firmly pull and twist the old thermocouple from its mounting bracket. A working thermocouple will generally get a reading between 25 and 35 millivolts. Unscrew copper lead and connection nut inside threaded connection to gas line.

Remove the burner assembly and detach the thermocouple. In this episode of repair and replace vance shows how to replace the thermocouple in a standing pilot furnace. Be sure steel tube is up and copper lead is down.

How to replace a thermopile on a water heater. Use it to unscrew the connector that holds the thermocouple to the gas valve then unhook the probe from its clip and pull out the entire thermocouple assembly. How to replace a water heater thermocouple.

Tightly screw nut into place but do not over tighten. Take the old thermocouple to the hardware home improvement or plumbing supply store. Procedure for replacing a thermocouple the only tool you need to replace a thermocouple is a wrench.

The burner typically sits loosely or under clips. 1 cause of pilot lights that won t stay lit is a worn out thermocouple. Shut off the gas and electrical power to the furnace.

Once you have determined that the thermocouple is faulty it s time to replace it. Turn off the gas supply.