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Thermocouple. Keep pilot knob depressed for 30 seconds after lighting pilot.
The thermocouple proves to the system that the pilot light is lit and the gas valve can safely open.
It is most likely the thermocouple that is bad. That is what keeps the pilot light on. The thermocouple is the small tube that sits in the flame of the pilot and runs to the control valve.
Right below the thermocouple if applicable
THERMOCOUPLE or defective gas valve
If the pilot light is on, the heater should come on by itself. If the pilot light is off then it has to be lit. If it will not stay on, the thermocouple is bad.
low back, spillage, or a bad thermocouple.
Sounds like you need a thermocouple.
Most pilot lights are not adjustable. If it's not working properly the usual solution is to change the thermocouple.
Spillage excessive condensate bad thermocouple draft
thermocouple is bad.
Most likely the thermocouple is bad. The thermocouple is the little tube that sits in the flame of the pilot light. Runs from the pilot light to the control valve. Very simple to replace. Costs about $6.