Part Number: 040006847 12/19 53
Compressor Electrical Diagnostics
The compressor does not start or will trip repeatedly on
overload.
CHECK RESISTANCE (OHM) VALUES
NOTE: Compressor windings can have very low ohm
values. Use a properly calibrated meter.
Perform the resistance test after the compressor cools. The
compressor dome should be cool enough to touch
(49°C/120°F or below) to ensure that the overload is
closed and the resistance readings will be accurate.
SINGLE PHASE COMPRESSORS
1. Disconnect power from the ice machine and remove
the wires from the compressor terminals.
2. The measured resistance values between C and S and
between C and R, when added together, should equal
the resistance value between S and R.
3. If the overload is open, there will be a resistance
reading between S and R, and open readings between
C and S and between C and R. Allow the compressor
to cool, then check the readings again.
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