I have a Goodman furnace, Model Number PGB036050-1 REV A.

LED is blinking 3 times, which, according to diagram on furnace " END SWITCH CLOSED WITHOUT INDUCER ON" I loosened the nuts on the Fan, Then if I give the back of the fan a little smack, it turns on and the furnace starts up. It will only run to the next cycle.

The HVAC tech, said he probably can't get parts. Not sure if he is just trying to sell me a new furnace. What part can I replace or clean to keep this thing running? I would at least like to order the part then have a qualified person installl it.

Thanks