At first both fan and compressor didn't start and the unit was humming. I turned off circuit breaker, replaced capacitor (5/40 370V), turned on circuit breaker.

The current situation is:

When I turn on the unit by switching from off to cool at thermostat, compressor runs but fan wouldn't start. Fan moves slightly then stuck. I try pushing blades and it doesn't help. I feel resistance when pushing the blades. Compressor shuts off by itself in a few minutes.

The blades move freely when the unit is off.

While I reconnecting the capacity, I did Fan, then HERM, then accidentally touched C wire to HERM, then connected C. Could the "touch" caused any damages?

What should I do from here?


Thanks,
Richard

I believe the fan motor is probably toast but proper electrical testing is in order.

What tests can I do and what tools would I need to find out if the fan motor is bad...

At first both fan and compressor didn't start and the unit was humming. I turned off circuit breaker, replaced capacitor (5/40 370V), turned on circuit breaker.

The current situation is:

When I turn on the unit by switching from off to cool at thermostat, compressor runs but fan wouldn't start. Fan moves slightly then stuck. I try pushing blades and it doesn't help. I feel resistance when pushing the blades. Compressor shuts off by itself in a few minutes.

The blades move freely when the unit is off.

While I reconnecting the capacity, I did Fan, then HERM, then accidentally touched C wire to HERM, then connected C. Could the "touch" caused any damages?

What should I do from here?


Thanks,
Richard



An Amprobe will tell you right away because a defective motor will have a very high current draw,higher than the listed draw on the info tag for the unit.

Do not keep testing with the compressor active or it might damage the internal overload since you mentioned it shut off by itself.

Get an ohms meter and check continuity between leads on your fan motor. Then go over the wires and make sure it is wired correctly especially the run capacitor. Usually when the wires are arched by error it will trip the breaker but not damage the motor. It sounds like if any component is damaged it is going to be your run capacitor.
Good Luck and God Bless
Jimmy The Air Guy

Compressor runs, but fan doesn't. Two different capacitors, (45, 7.5) both read 0.1 MFD. I check with Ohmeter, 7.5 capacitor is reading 37... 45 capacitor reads 2.4... Fan blade turns freely. What could the problem be?