Air Conditioning - Heat pump not running

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GBaldwin81
07-01-09, 06:23 PM
I just noticed that my heat pump is not running.

I checked the circuit breaker, it's fine. I tried turning it off at the disconnect a few times, but that didn't work either. With the power still shut off to the unit, there is still a humming sound.

When I try to spin the blade, it spins freely.

Any ideas on what I should check next?

It's a Carrier 38y 3 ton unit.

Thanks.

daddyjohn
07-01-09, 10:05 PM
Check to see what the voltage is at the outdoor unit, it should be 240 volts. The humming nosie is probably the contactor.
GBaldwin81
07-02-09, 07:01 AM
The voltage just before the fuse is 240. There is no voltage after the fuse. How do you tell if one of those fuses are blown? I assumed there would be some physical indicator when I checked it out last night.

I'll pickup some replacement fuses and a contactor today.

daddyjohn
07-02-09, 09:46 AM
Your meter has an ohms function, use it to test the fuses. Take the fuses out of the box to do this. Are these fuses in a disconnect near the unit? Make sure the replacement fuses are dual-element time delay type and not NON fuses.
GBaldwin81
07-02-09, 11:23 AM
Yeah, they were the fuses in the disconnect. I just replaced them and everything is working fine.

Thanks for your help. I had it in my head that the fuses were fine because they didn't look any different. I would have been kicking myself if I had an electrician come out to replace a pair of fuses.
daddyjohn
07-02-09, 11:49 AM
Sounds good. Are the fuses tight in the clips? Are the wiring connections in the disconnect tight as well? You used dual-element time delay fuses?