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Electrical System
Diagnosing Ice Machine That Will Not Run
WARNING
High (line) voltage is applied to the control board
(terminals #55 and #56) at all times. Removing
control board fuse or moving the toggle switch to
OFF will not remove the power supplied to the
control board.
Step Check Notes
1 Verify primary voltage supply to ice
machine.
Verify that the fuse or circuit breaker is closed.
2 Verify the high-pressure cutout is
closed.
The H.P.C.O. is closed if primary power voltage is present
at terminals #55 and #56 on the control board.
3 Verify control board fuse is OK. If the bin switch light functions, the fuse is OK.
4 Verify the bin switch functions properly. A defective bin switch can falsely indicate a full bin of ice.
5 Verify ICE/OFF/CLEAN toggle switch
functions properly.
A defective toggle switch may keep the ice machine in
the OFF mode.
6 Verify low DC voltage is properly
grounded.
Loose DC wire connections may intermittently stop the ice
machine.
7 Replace the control board. Be sure Steps 1-6 were followed thoroughly. Intermittent
problems are not usually related to the control board.