Once you have determined that the thermocouple is faulty it s time to replace it. Unscrew the nut that holds the thermocouple end fitting into the gas control valve using an.

No Hot Water Replace The Thermocouple Heater With Sealed

Tightly screw nut into place but do not over tighten.

How to change a thermocouple. Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. If the furnace has been running wait 30 minutes for the thermocouple to cool completely. A working thermocouple will generally get a reading between 25 and 35 millivolts.

First shut off the gas valve on the water heater and the gas valve on the gas line near the heater. Turn off the gas supply. Shut off the gas and electrical power to the furnace.

How to replace a water heater thermocouple. A new one costs about 5 to 10 and is easy to install. 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. Remove the furnace s access cover. Make sure that the gas controller is in the off position.

Before you do this be sure to turn off the line valve on the gas supply. Detach the thermocouple from the burner. Be sure steel tube is up and copper lead is down.

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. The thermocouple is usually. Unscrew copper lead and connection nut inside threaded connection to gas line.

The only tool you need to replace a thermocouple is a wrench. Insert new thermocouple into hole in bracket. 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.