126 Part Number 80-1505-3 6/11
SAFETY LIMIT#1
Freeze time exceeds 60 minutes for 6 consecutive
freeze cycles
Possible Cause Checklist
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
page 151.
Water System
• Dirty/defective water level probe
• 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
• Loss of water from sump area
Electrical System
• Low incoming voltage
• Ice thickness probe out of adjustment
• Harvest cycle not initiated electrically
• Contactor not energizing
• Compressor electrically non-operational
• Defective fan cycling control
• Defective fan motor
Miscellaneous
• Non-Manitowoc components
• Improper refrigerant charge
• Defective head pressure control
• Defective harvest valve
• Defective compressor
• TXV starving or flooding (check bulb mounting)
• Non-condensable in refrigeration system
• Plugged or restricted high side refrigerant lines or
component
• Restricted air flow/dirty condenser fins
• High inlet air temperature
• Condenser discharge air recirculation
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