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MC0322 through MC2148
Air, Water, and Remote Cooled Service Manual
Test Procedure - Compressor contactor
1. Test using the controller's indicator lights. When the unit is in ice making mode (continuous F in the display)
the compressor contactor will have power.
•
Check the Compressor indicator light, when it is on the compressor contactor will have pulled in. If it is not,
do a voltage check.
•
Place voltmeter leads on the coil of the contactor. There should be full voltage.
•
If there is full voltage present and the contactor has not pulled in, replace the contactor.
•
If there is no voltage check if the high pressure cut out is open. If the high pressure cut out is closed, check
for voltage from the controller to ground. The contactor pin is 4. Check from 4 to ground, or on 220 volt
models, to the other power leg (usually L2) when the compressor indicator light is on. There should be
voltage. If not, replace the controller.
•
If there is voltage at the controller but not at the contactor coil, the harness wires or connectors are
damaged and must be replaced.
2. Test using an ohmmeter. Test the coil of the contactor for continuity or shorts to ground. Replace if open or
shorted.
3. Check connections and contacts. Be sure connections are tight and that the contacts are not burnt. Replace
any contactor with burnt contacts.
This light is ON when the compressor is
operating.
January 2022
Page 54
8 - Fan Motor
Brown
Red
7 - Inlet Water Sol
White
Blue
6 - Water Pump
Brown
5 - Hot Gas Valve
White
4 - Compressor
Yellow
3 - Purge Valve
Red
Black
1 - Line In
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