Diagnosing An Ice Machine That Will Not Run - Manitowoc QM30A Installation, Use And Care, And Service Manual

Service

Diagnosing an Ice Machine That Will Not Run

High (line) voltage is applied to the control board
(terminals #8 and #2) 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
1 Verify primary voltage is supplied to ice
machine.
2 Verify control board fuse is OK.
3 Verify ICE/OFF/WASH toggle switch
functions properly.
4 Verify the bin thermostat functions
properly.
5 Verify low DC voltage is properly
grounded.
6 Replace the control board.
6
2
3
6-8
WARNING
Check
5
Verify that the fuse or circuit breaker is closed.
If the power light functions, the fuse is OK.
A defective toggle switch may keep the ice machine in
the OFF mode.
A defective bin thermostat can falsely indicate a full bin of
ice.
Loose DC wire connections may intermittently stop the ice
machine.
Be sure Steps 1-6 were followed thoroughly. Intermittent
problems are not usually related to the control board.
1
Section 6
Notes
4