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1.Poor power connection resulting in insufficient voltage to unit (loose wall outlet, wiring, bad circuit breaker, etc). 2.Compressor starting components have failed (start/run capacitor, PTC or permanent temperature coefficient which is a combination start assist overload relay assembly. Symptoms for above include compressor attempting to start, failing to do so, humming loudly, perhaps shaking or vibrating while attempting to start and then a soft click as the compressor's internal winding protector (usually a bi-metal switch inside the compressor shell) opens and the unit shuts down. The lights dim due to the high amp draw on the compressor as it tries to crank without it's start components working (it's pulling locked rotor amps). 3.The compressor is locked up mechanically internally.(lights dimming and humming occur here, too). 4.You did not allow sufficient time for the high and low side (suction and discharge) pressures to equalize before re-starting the unit.Wait five to ten minutes. Hope this helps.
ETL
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