I have a compressor (two months old) on a new beer box, found overload relay open. Replaced relay, compressor came on for a couple seconds and tripped off. Relay is good
Look up the compressor model and ohm out the winding's first. Also make sure to test for a short to ground. Is it a current relay or potential? They work different. Potentials have to be level to work right. A two month old unit will be under warranty from both the manufacturer and compressor company. For a overload to die that quick you have to have a solid short or over voltage condition. Current relays have a open contact till locked rotor current is established on the run winding to close the relay. Do to this they are not testable in the field. The points also arc every start cycle as they open. So replacement is a normal with servicing. They are only used on capacitor start,induction run or split phase motors. Moderate to low starting torque.
Give us a case model or compressor make and model if you can..
It’s a current relay and not shorted to ground
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If the winding ohm out to the correct value, and the unit has good power, ie; no extension cords, dedicated outlet, and sound wiring internal with the correct voltage. Then I would try a relay, cap. But it sound like the compressor has a internal load problem. ie; broken ring, bad bearing, foreign material in a bearing. I've cut several apart over the years to find out why they failed. And the wire lead wraps around inside to the motor that hangs on springs. So it could be a intermittent short as well.
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