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What causes compressor terminals to blow out?

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There could be several causes, but the most common are these two..
1. Loose connections to the terminals.
2. Over-amperage on the terminal.

Posted on Sep 18, 2008

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I would run the motor with no load, remove the belt or coupling to the compressor pump, and read the amperes and compare to the motor nameplate rating, let it idle a few minutes and listen for bearing noise. By reading motor amperes or current while the compressor is still connected to the motor, it can be determined if the reset button/overload protector is weak. Check every electrical connection for discoloration or overheating and repair if any are found. Check the contacts of the pressure switch. If nothing wrong is found and the motor is just overdrawing current or amperes, then it is time to replace the motor, probably due to a weak or defective motor internal winding.

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1) you have a wire (or maybe 2) burnt away from the terminal(s). To repair this is fairly simple for the service tech but somewhat complex for the inexperienced, so I won't go into here - but if this is the problem you can probably (with a little expert help) fix it yourself.

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Angelo V.

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