Thermocouple Replacement
Replacing a thermocouple is fairly easy if you follow these steps:
- Shut off gas and power to the furnace.
- Remove the furnace's access cover.
- If the furnace has been running, wait 30 minutes or so until the thermocouple cools.
- The end of the thermocouple is screwed into the gas control valve. Unscrew the nut that holds the thermocouple end fitting into the control valve.
- The thermocouple is fastened to the standing pilot burner assembly bracket with a nut at the bottom of the bracket or a nut below and above the bracket. Unscrew the nut(s) and remove the thermocouple.
- Connect the new thermocouple to the pilot burner assembly bracket.
- Clean the threaded gas control valve opening and fasten the thermocouple end fitting to the gas control valve about 1/4 of a turn beyond where it feels tight by hand.
- Turn on the gas and power to the furnace.
- Turn on the pilot light and make sure about 1/2” of the thermocouple is in the pilot flame.
- Replace furnace access cover.
