Test the compressor relay for continuity using a multitester.
Set the multitester to the ohms setting X1.
With the relay upside down, place the probes
into the terminals labeled "S" and "M". The multitester 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 multitester 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 multitester 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 multitester 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.
