York 80 diamond compressor fan is not spinning..how do you tell if the fan motor is bad?

Usually a bad start capacitor on the fan motor. It jump starts the motor

where is the air filter located on a York diamond 80?

Sounds like your fan switch is defectiveor posibble installed in the wrong place. This switch is heat controlled and delays the fan coming on until there is warm air to blow.

Hello, try to use a thin object to spin the fan blade, if it starts up with help pushing it the capacitor is bad and must be replaced. If the fan does not start up by pushimg it then the motor must be replaced.

Hello, if the compressor is running on the outside unit and the fan is not either you have a bad capacitor or a bad fan motor, if the fan starts with a push then your capacitor is bad, if it does not the motor is shot.

sounds like a curcuit board problem

Check for 24 volts across the two terminals on the gas valve when the ignitor glows. If yes, bad gas valve or blockage in the gas train. If no, bad ignitor or circuit board. Even if the ignitor glows, it still may be bad and not sending the proper signal to the board. If you jump the R and G terminals on the circuit board, does the fan still only run for 90 seconds? If so I would say replace the board.

Mostly likely the problem is in the pressure switch that tells the board that the blower started and it is okay to fire the burner. The pressure switch is usually a 2" or so round thing about 1" thick, it will have one or two tubes coming out of it that go to the blower or heat exchanger. Make sure that the tube is not cracked or that it has not come off at either end.
The pressure switch can be jumped out to check out if that is the problem, but you need to jump it out after the cycle has started and the switch needs to open after a cycle for the heater to refire again, so that fix would be very temporary. But it may tell you for sure what the problem is.

the wire diagram should tell you how. it all depends where wires lead to. be very carefull, capacitors can be dangerous. brown usaully go to fan black usaully goes to common red usaully goes to herm or compressor. it all depends where wires come from

Need blower motor for York Diamond 80 Furnace I am in St Louis MO where can i get one