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Do you get blinking light on the circuit board in the blower section?
That code will be present for 90 seconds..after 90 seconds the main blower stops and exhaust fan starts...then the error code will happen
and the exhaust fan starts?
ok that is our issue.
Now it must be determined if the exhaust motor gets power (120v)...and doesnt run.....OR...the circuit board is not sending power..
So it boils down to 2 choices..
120v at motor and no operation = bad/stuck motor
120v NOT at motor = bad circuit board