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Refrigeration System
Safety Limit #1
Freeze time exceeds 60 minutes for 3 consecutive freeze cycles.
Possible Cause Check/Correct
Improper installation • See “Installation/Visual Inspection Checklist” on page 7-10
Water system • Low water pressure (20 psi min.)
• High water pressure (80 psi 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 water
flow (water-cooled models)
• Low water pressure (20 psi min.)
• High water temperature (90°F/32.2°C max.)
• Dirty condenser
• Dirty/defective water regulating valve
• Water regulating valve out of adjustment
Refrigeration system • Non-Manitowoc components
• Improper refrigerant charge
• Defective hot gas valve
• Defective compressor
• TXV starving or flooding (check bulb mounting)
• Non-condensables in refrigeration system
• Plugged or restricted high side refrigerant lines or component
SAFETY LIMIT NOTES
• Because there are many possible external problems, do not limit your diagnosis to only the items listed in
this chart.
• A continuous run of 100 harvests automatically erases the safety limit code.
• The control board will store and indicate only one safety limit – the last one exceeded.
• If the toggle switch is moved to the OFF position and then back to the ICE position prior to reaching the
100-harvest point, the last safety limit exceeded will be indicated.
• If the harvest light did not flash prior to the ice machine restarting, then the ice machine did not stop
because it exceeded a safety limit.