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Compressor engages for 3 seconds then shuts off then later does it again. Is there a safety system or relay switch associated with the compressor engaging?

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Hi,
The compressor is trying to start but cannot so the overload kicks it off...
The start relay and capacitor maybe bad if it has those parts... even so the compressor may also be bad...

heatman101

Posted on May 19, 2011

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Sounds like it's shutting off due to high pressures in the system. Do you have gauges to read the system pressures? One thing that would cause this is too much freon in the system, or too much oil. Did the compressor come with oil in it or did you add oil to the system? Too much oil and/or freon will give high pressures and the high pressure switch will shut the system off. Or the high pressure switch could be damaged, maybe even unplugged is a possibility. If it is plugged in you could try unplugging it and seeing if the compressor keeps running for longer than 3 seconds, if it does pressures might be too high. It could also be a bad relay getting hot and kicking off. Try switching relays and see what happens. Another possibility is the low pressure switch but not too likely in this case.

When the compressor shuts off, can you turn it by hand? If not, high pressures or even a bad compressor are possible.

Lot's of possibilities. Just have to wade through them. I'd start with the relay and then check the pressures.

Good luck.

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