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candolandsc
Mar 10, 2012, 12:02 PM
Exhaust fan comes on for two seconds and goes off. Control board light is steady no blinks

T-Top
Mar 10, 2012, 06:32 PM
If you don't have a fault code on the control board when it shuts down.I would say the control board is bad. You can try jumping the wires R to W at the thermostat to make sure you don't have a bad thermostat or heat anticipator. If it works the thermostat is bad.

candolandsc
Mar 10, 2012, 07:19 PM
Thanks. I took off hose to pressure switch. Not clogged. Reinstalled. Furnace working. Could thermostat or pressure switch work intermittently?