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I have an older ac roof top unit (1988) its made by Coleman. When you first turn on the unit as long as it is cool, it will run for about five minuets on the low speed cycle (very cold), if you switch it to high cool it will run for about one to two minuets then it will trip the house breaker (20amps), not the couch breaker (30amps). I replaced the start cap, motor cap and another unnamed cap. The only things left in the system are a start relay and a thermal cut off switch which sits on top of the compressor, I bypassed this switch to see if it was the problem, but it still trips the breaker. I'm lost from this point and any help would be great

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Take a current reading on the compressor and the fan motors to see witch one is pulling the high current.

Posted on Jun 27, 2009

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