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New compressor won't start

Copeland compressor wont start, getting proper voltage at top and bottom of contactor, new capacitor and hard start. ANY help out there?

Posted by Anonymous on


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Posted on Jan 02, 2017


SOURCE: new copeland compressor wont start

Hello,By all means install a hard start kit on the cap.Your wiring is correct.A scroll compressor usally doesn't need a start kit but I have seen 5 ton units that take one.Check the compressor tag and make sure the compressor is not a 3 phase motor!

Posted on Apr 21, 2010


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I assume that is a 240 volt unit. If you have a volt meter, check for power across the contactor . If it is a 240 volt unit you should get 240volts on both sides of the contactor. If you DO have voltage across the contactor (after it closes) you need to try and get to the compressor where the wires connect to it. There should also be 240 volts at the compressor terminals marked "C" and "R". If you have power at the compressor between C and R and the compressor is still not even trying to start, the compressor windings are open. Here is really what any tech will need to know to really help you:
(1) Is the fan motor running?
(2) what voltage is the unit?
(3) is the compressor humming or trying to start?
(4) do you have the proper voltage at the unit?

If you can answer these questions and you want to email me, do so and I will step you thru it. Be very careful , as you are dealing with high voltage.

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