Manitowoc Marine Q 1000, Service Technician'S Handbook

Page: 92 / 179

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Safety Limit #1
Refer to page 75 for control board identification and
safety limit operation.
Control Board with Black Microprocessor - Freeze
Time exceeds 60 minutes for 3 consecutive freeze
cycles
or
Control Board with Orange Label on
Microprocessor - Freeze time exceeds 60 minutes
for 6 consecutive freeze cycles
Possible Cause Checklist
Improper Installation
•
Refer to “Installation/Visual Inspection Checklist”
Water System
•
Low water pressure (20 psig min.)
•
High water pressure (80 psig max.)
•
High water temperature (90°F/32.2°C max.)
•
Clogged water distribution tube
•
Dirty/defective water fill valve
•
Dirty/defective water dump valve
•
Defective water pump
Electrical System
•
Ice thickness probe out of adjustment
•
Harvest cycle not initiated electrically
•
Contactor not energizing
•
Compressor electrically non-operational
•
Restricted condenser airflow
•
High inlet air temperature (110°F/43.3°C max.)
•
Condenser discharge air recirculation
•
Dirty condenser fins
•
Dirty condenser filter
•
Defective fan cycling control
•
Defective fan motor
•
Restricted condenser water flow
•
Low water pressure (20 psig min.)
•
High water temperature (90°F/32.2°C max.)
•
Dirty condenser
•
Dirty/defective water regulating valve
•
Water regulating valve out of adjustment