Question about Goodman GMS90703BXA Heater

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No Heat The fan kicks on and blows cold air the sensor light flashes 3 times on the board. The fan is the only thing running

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3 flashes indicate an issue with either the inducer, pressure switch, plugged condensate drain or a venting restriction.

Clear all debris from the exhaust and intake air piping. Make sure they are not drooping anywhere.
Check the pressure switch and the rubber hoses for blockage.
Blow out the drain line that evacuates the condensation.
On the inducer motor housing, un- plug the rubber hose going to the pressure switch and check to see if there is suction when the motor is running.
Make sure your air filter is clean.
Listen to the inducer motor as it turns for gurgling or any other abnormal sounds.

To make the heater run while you have the cabinet open, tape down the door safety switch. Remove the tape after diagnosos.

Posted on Dec 19, 2007

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