Hot air furnace problem.
Model Number: GH-120DE Brand: Amana Age: More than 10 years
This furnace is about 35 years old, original equipment, it came with the house.
The thermostat is a lot more recent, the gas valve thermocouple was replaced a couple of years ago.
SYMPTOMS:
The thermostat calls for heat, the main burner comes on, after a while the fan starts up, but after a few seconds it all shuts down and tries again in about half a minute. I have verified that the fan does actually spin.
IDEAS so far:
The gas valve, thermocouple, fan and main burner are probably OK.
I think there is "something" that is not acknowledging that the fan is spinning and pushing air. This might be an air flow sensor or a thermostatic switch, I can imagine designs that would use either.
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