Furnace Pilot Light Won T Stay Lit With New Thermocouple

While this is an excellent safety feature a faulty thermocouple may decide arbitrarily that your pilot light is off when you want it on shutting down your pilot light and your furnace.

Furnace pilot light won t stay lit with new thermocouple.

You can test it with a multimeter. The pilot light is supposed to be a strong blue cone not a weak yellow flame. Thermocouples detect pilot lights by sensing the heat they produce. Pilot stays lit for two weeks then goes out with the thermocouple brand new.

Flame on pilot light does not hit thermocouple. Cleaning out the pilot orifice means disassembling the pilot and clearing out the debris using a needle or compressed air. When your pilot light will not stay lit for more than a few moments turn the pilot light on and be sure it is aimed at the thermocouple. A faulty thermocouple may arbitrarily determine that the light is off when you want it on and vice versa.

This device generates a small electric signal to keep the gas valve open when the pilot is on. Pilot light won t stay lit after releasing bypass button. The thermocouple detects the pilot light via sensors. The pilot orifice may be full of dirt.

If the pilot light is not aimed correctly simply bend the thermocouple to line it up with the pilot tube. Gas water heater pilot wont stay lit even after replacing the thermocouple. Thermocouple produces 20 mv. When my pilot light wouldn t stay lit on my furnace i asked a few plumber buddies about the symptoms and they both said it was the thermo couple.

Some common causes include issues with the thermocouple and pilot tube. If your furnace s pilot light won t stay on the furnace won t work. A weaker flame won t envelop the thermocouple properly. If the pilot lights but won t stay lit the thermocouple is probably bad.

Every gas appliance with a standing pilot that cycles on and off needs a thermocouple. Be sure everything has cooled down before realigning the thermocouple and pilot light.