Manitowoc Marine Q 1800 Service Manual

Also see for Marine Q 1000: Use and care manual Installation instructions Service technician's handbook

Contents

36Refrigeration SystemSafety Limit #2Harvest time exceeds 3.5 minutes for 3 consecutive harvest cycles.Possible Cause Check/CorrectImproper installation • See “Installation/Visual Inspection Checklist” on page 7-10Water system • Water area (evaporator) dirty• Dirty/defective water dump valve• Vent tube not installed on water outlet drain• Water freezing behind evaporator• Plastic extrusions and gaskets not securely mounted to the evaporator• Low water pressure (20 psi min.)• Loss of water from sump area• Clogged water distribution tube• Dirty/defective water fill valve• Defective water pumpElectrical system • Ice thickness probe out of adjustment• Ice thickness probe dirty• Bin switch defective• Premature harvestRefrigeration system • Non-Manitowoc components• Water regulating valve dirty/defective• Improper refrigerant charge• Defective hot gas valve• TXV flooding (check bulb mounting)SAFETY LIMIT NOTES• Because there are many possible external problems, do not limit your diagnosis to only the items listed inthis 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 the100-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 stopbecause it exceeded a safety limit.