Manitowoc Marine Q 1000, Service Technician'S Handbook

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Diagnosing Ice Thickness Control Circuitry
ICE MACHINE DOES NOT CYCLE INTO HARVEST
WHEN WATER CONTACTS THE ICE THICKNESS
CONTROL PROBE
Step 1. Bypass the freeze time lock-in feature by
moving the ICE/OFF/CLEAN switch to OFF and back
to ICE. Wait until the water starts to flow over the
evaporator.
Step 2. Clip the jumper wire leads to the ice thickness
probe and any cabinet ground.
Monitor the Harvest light.
Harvest Light On
•
The Harvest light comes on, and 6-10 seconds later,
the ice machine cycles from Freeze to Harvest.
The ice thickness control circuitry is functioning
properly. Do not change any parts.
•
The Harvest light comes on, but the ice machine
stays in the Freeze sequence.
The ice thickness control circuitry is functioning
properly. The ice machine is in a six-minute freeze
time lock-in. Verify step 1 of this procedure was
followed correctly.
Harvest Light Off
•
The Harvest light does not come on.
Proceed to step 3.