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FAULT DIAGNOSIS
Check the status of the Service lamp on the Controller Board (LED-5) by removing the
Control Box Cover.
Lamp ON – Water Plate closed
This tends to indicate the Back-up Timer has stopped machine operation during the
freeze cycle. High ambient and water temperature are an obvious cause. But check
out each component that could result in an extended freezing time (See guide below).
Lamp ON – Water Plate open
The Timer has stopped the machine because if an excessive defrost time. See the
guide below to check out the probable cause.
Lamp flashing ON/OFF
If on the first cycle, check out the Cam operation and/or Toggle Switch. If the machine
has been in service for some time, the Controller Board may be at fault.
REMEMBER: Hoshizaki controllers are very reliable. They also control every component’s
Operation. So if a component malfunctions, the controller will respond.
Do not replace controllers in an attempt to shorten the diagnosis process and
not before carefully checking the actual fault and possible cause.
When the icemaker stops, the Controller Board Interlock indicator shows possible faults.
PATTERN
INTERLOCK
INDICATOR
WATER TANK
POSITION
POSSIBLE CAUSE REMEDY
1
2
3
1.
4
Only
First
Cycle
Actuator
Toggle Switch
Lever bent
Replace
Actuator
Toggle
Switch
Replace
Replace
Replace
Can Arm (A) Broken
Defective
Actuator Motor
Defective
Controller Board
O
Cam Arm
Flashing