How to Check the Condition of an Air Conditioning Compressor?

1 Answers
DeMiles
07/30/25 10:10am
The steps to check the condition of an air conditioning compressor are: 1. First, learn to identify the three terminals on the air conditioning compressor, which are S, R, and C, where S is the start winding, R is the run winding, and C is the common terminal; 2. Then, use a multimeter to measure their resistance values. The sum of the resistances between SC and RC should equal the resistance between RS, which is the normal data; 3. If the resistance values deviate too much or there is no resistance between the three, the compressor is likely faulty; 4. However, sometimes even if the multimeter shows normal values, if there is an internal short circuit in the compressor, the multimeter may not detect it; 5. For such cases, a simple method is to use the multimeter to check the power supply condition.
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