Furnace Pilot Light Won T Stay Lit With New Thermocouple

A faulty thermocouple may arbitrarily determine that the light is off when you want it on and vice versa.

Furnace pilot light won t stay lit with new thermocouple.

Cleaning out the pilot orifice means disassembling the pilot and clearing out the debris using a needle or compressed air. Pilot light won t stay lit after releasing bypass button. Be sure everything has cooled down before realigning the thermocouple and pilot light. 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.

A weaker flame won t envelop the thermocouple properly. 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. Thermocouples detect pilot lights by sensing the heat they produce. If your furnace s pilot light won t stay on the furnace won t work.

Some common causes include issues with the thermocouple and pilot tube. The pilot light is supposed to be a strong blue cone not a weak yellow flame. 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. Valve coil 121 ohms.

The thermocouple detects the pilot light via sensors. You can test it with a multimeter. If it determines that the pilot light is off it shuts down the flow of gas. Pilot stays lit for two weeks then goes out with the thermocouple brand new.

The pilot orifice may be full of dirt. 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. Flame on pilot light does not hit thermocouple.

Thermocouple produces 20 mv. This device generates a small electric signal to keep the gas valve open when the pilot is on.