Although technicians should follow the system manufacturer’s instructions and guidance, basic troubleshooting steps for these symptoms typically include: Michael Robertson, senior account manager at LG Electronics USA Component Solutions Business, added that a locked rotor, poor cooling/heating (if heat pump), and of course, a compressor not running are all signs of compressor distress. If it does, valves are not sealing properly. Check reciprocating compressor valves by pumping down system and determining if refrigerant is leaking past the valves. If scroll is running backwards, it will be very loud and will not build pressure. Three-phase scrolls will reverse-rotate if the incorrect phase sequence is connected to it.Also verify the compressor voltage rating is the same as the supply voltage. Check the compressor model against the unit nameplate and evaporator to make sure it is correct.On single-phase compressors, make sure the start capacitor and relay are functioning as required, and if there is an internal overload, test it to ensure it is closed. Check voltage at compressor to ensure it is within the correct range and ensure wires are connected properly at compressor. On both single- and three-phase compressors, verify if start contacts are closed.
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