Test the compressor relay for continuity using a multimeter . Set the multimeter to the ohms setting X1.
With the relay upside down, place the probes into the terminals
labeled "S" and "M". The multimeter should display a reading of zero
ohms, indicating continuity (or if using a continuity tester, it should
light up).
With the probes still in place, turn the relay over. You should hear
the click of the magnetic switch engaging. The multimeter should now
display an ohm reading of infinity (or the tester should not light up).
Turn the relay upside down again, place the probe on the "S" terminal and place it on the side terminal labeled "L".
The multimeter should now display a reading of zero ohms
(continuity). Turn the relay over and the reading should change to
infinity.
With the relay upside down place one probe on the "L" terminal and the other probe on terminal labeled "M".
The multimeter should display a reading of zero ohms. Turn the relay over and the reading will stay the same, zero ohms.
If the compressor relay does not pass all of these tests, it should be replaced.
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