Air Conditioning - Compressor wont turn off

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tjm339
09-05-05, 12:54 PM
Compressor was not turning off on a 30 yr. old Carrier unit. I replaced the contactor and problem was fixed for a week now problem is back. Any ideas?

Jay11J
09-05-05, 03:47 PM
Do you know if you are getting power at the contactor at all times?
tjm339
09-05-05, 10:50 PM
I have to check. This is a old system and the contactor is controlled by 240 volts

tjm339
09-06-05, 10:51 AM
There is no voltage at the coil. I get 240 volts at bottom of contactor but none on top I cant figure how is this fan getting power. Anyone ever run into this?
tjm339
09-06-05, 12:13 PM
inside the unit I have a

Start Relay
Control Relay
Holding Relay
Contactor
Indoor Fan Realy
Transformer
Timer Motor

I replaced the contactor, but problem came back in a week
Ed Imeduc
09-06-05, 12:22 PM
If you pull the Y wire off at the tstat does the outside unit still run??????

This is a old system and the contactor is controlled by 240 volts
I go back that far and then all units worked off 24V for the controls. That is unless you have a Com. set up here

ED ;)
tjm339
09-06-05, 01:35 PM
Yes if I take off the Y wire it still runs. The problem now happens abut half the time. There is a transformer in unit that sends out 24 volts to the control relay. I think the control relay is my problem. Is there any way I can test it before buying a new one?
Ed Imeduc
09-06-05, 01:38 PM
Yes just pull one leg of the 24V to it off and see if it drops out

ED ;)