Over time thermocouples can begin to malfunction and shut off the gas supply to the pilot light even if it s burning properly.
Wall heater pilot light goes out.
In english that means a gas valve is slowed to continue to release gas for up to 30 seconds after the pilot fails.
Pilot goes out the heater won t operate properly if the pilot flickers is too weak or goes out and the cause could also be blockages in the pilot tube.
If the thermocouple is too far from the flame this can cause the pilot to go out and shut down the propane heater.
You can fix this easily by moving the thermocouple closer to the flame.
Keep every intake air register in your home open and clear to avoid a vacuum effect in the inlet.
Thermocouples work by producing a small amount of voltage when it is heated.
If your pilot light re lights easily after going out overnight it s possible it was blown out by a draft.
Another cause of a weak pilot is a faulty.
If so replace the entire valve.
Does my thermocouple need repl.
If your pilot light.
My furnace pilot light will not stay lit.
This can happen on excessively windy days or nights.
The number one reason why the pilot light keeps going out is the thermocouple.
A bent or dirty thermocouple.
But once i let go of the button the pilot immediately goes out.
Stays lit for a few seconds but goes out has a weak yellow flame instead of blue then you most likely have a dirty or restricted pilot light orifice.
A leak in the output duct of the furnace could cause air to blow into the area.
I can light it and depress the pilot switch for 2 minutes.
The initial flame of the pilot heats the thermocouple which will signal the valve to stay open and keep the pilot lit and the propane heater functioning.
Gas valve are allowed 30seconds to fall out.
If it senses that the pilot light has gone out the thermocouple shuts off the gas supply to the flame in order to prevent safety issues with your water heater.
There could a fault in the gas valve s main burner solenoid causing it to draw excessive power and starving the pilot flame solenoid.