Manitowoc Marine Q 1000, Service Technician'S Handbook

Page: 73 / 179

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Diagnosing an Ice Machine Head Section
that Will Not Run
1. Verify primary voltage is supplied to ice machine
head section and the fuse/circuit breaker is closed.
2. Verify the High Pressure cutout is closed. The
HPCO is closed if primary power voltage is present
at terminals #55 and #56 on the control board.
3. Verify control board fuse is okay. If the bin switch or
water level probe light functions, the fuse is okay.
4. Verify all bin switches function 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.
!
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.