Jump the two wires going to the thermostat, if it starts , you have either a bad thermostat or a broken thermostat wire. If it does not fire up, you will need to check for 24 volts AC going to the gas valve from the transformer. If you have voltage, you have a gas valve issue. If no voltage, check for a limit switch that may have overheated with an Ohm meter. If they all test good, replace the transformer.
I have a williams ceramic gas wall mounted 3509622 the pilot is on ,but the furnace is not working.
I have a 3509622 wall heater I turn the the pilot on, as soon as the thermostat kicks in the furnice makes a popping noise and pilot turns off and furnice doesn't turn on. please help.
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