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Originally Posted by C-Mac
KC Kings\Dan
I assume the reverse is true that a defaulty relay would keep the compressor from shutting off when the fan shuts off or could it be further up the line? I replaced the relay last year because the compressor wasn't kicking on.
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Is that the problem you are having now, that the compressor never turns off? The relay is two pieces of metal seperated by springs. When 24 vdc comes to the relay it causes the outside piece to suck in via a magnetic force stronger than the spring. Since your AC has been off all winter it should not be stuck on. It is possible but not very probably that the relay is stuck with the plates connected. The opposite would be possible, because sometimes when your relay is "replaced", the points are just cleaned and you are charged for a new part that was never installed.
If your compressor is on all of the time, is your internal fan on all of the time also? If it doesn't get cool your thermostat will never shut off the internal, which will never shut off the external.