The more resistance, the harder it is for a current to pass through the conductor. 3 Phase Compressor Internal Troubleshooting: Checking a Short to Ground- Turn the Power off. And no further diagnostic to be done. If it is both, you will need to replace the compressor. Edit: After years of using the Supco M500 it HAS failed me many times. First, let me say that a short to ground on a compressor is most often not a defect in the manufacture of the compressor, but deficiencies elsewhere in the system. If the technician checked the compressor wires to ground using an Ohm Meter and found them to be ZERO ohms, then the windings are shorted to ground and there is no way that it will work. A chest freezer compressor is part of a system designed to freeze food to keep it from spoilage. Checking the Compressor Windings. If the compressor passes the above tests, take a multimeter set to R x 10,000 (10K) and check each winding to ground. This will only work for single phase compressors. You should have an infinite OL resistance to ground. We elected to clean up the system using a suction filter dry-out kit. So I did what they wanted. Make Sure the Ohmmeter is in the 1000 scale. got a 10,000 ohm resistance from each leg to ground. Electrical resistance is literally the difficulty that electricity has to get through a component, called a conductor. Now if you check compressor motor windings and not find any problem and still compressor did not run then change the capacitor and if still compressor not working then check the overload protector. Do not recommend for compressor troubleshooting. With a multi-meter in the OHM position put one lead to each of the wires on the compressor side of the contactor and the other lead to ground or the equipment frame. The compressor circulates the refrigerant gas to raise its pressure and temperature. So verify how the technician determined the "grounded compressor". If you get any reading of resistance then there is a short to ground in the compressor winding. You should check all of the remaining receptacles in the vicinity to find out whether this is an isolated incident or there is a larger concern. We performed an acid test on the refrigerant and found it to be slightly acidic. Continue to test T2 and T3 in the same fashion as T1. Take an Ohmmeter and attach one probe to T1 then take the other probe and touch it to the metal housing of the HVAC system, the housing of the compressor, or the copper pipe. A grounded compressor does not indicate a burnout but is a strong indication of a significant problem. Determine which side is the load side or compressor side of the contactor. To check short to ground with a multimeter, you need to measure resistance. A shorted motor will read 0 ohms across windings, to ground, or both. Keep the one lead on ground and check all wires leading to the compressor with the other. 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