Manitowoc

Safety Limit ChecklistThe following checklists are designed to assist theservice technician in analysis. However, becausethere are many possible external problems, do notlimit your diagnosis to only the items listed.Safety Limit #1Freeze time exceeds 60 minutes for 6 consecutivefreeze cycles.Possible Cause ChecklistImproper installation• Refer to “Installation and Visual InspectionChecklist” on page 104Water System• Water Level set too high (water escaping throughover flow tube)• 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 float valve• Defective water pumpElectrical System• Ice thickness probe out of adjustment• Harvest cycle not initiated electrically• Contactor not energizing• Compressor electrically non-operational• Restricted condenser air flow• High inlet air temperature (110°F/43.3°C max.)• Condenser discharge air re-circulation• Dirty condenser fins• Defective fan cycling control• Defective fan motor• Low water pressure (20 psig min.)• High water temperature (90°F/32.2°C max.)• Dirty condenser112 Part Number 80-01111-9 7/10