Manitowoc SM Series Installation, Operation And Maintenance Manual

Part Number 000001590 Rev03 11/19 31ChecklistIf a problem arises during operation of your ice machine, follow the checklist below before calling service. Routine adjustmentsand maintenance procedures are not covered by the warranty.Problem Possible Cause To CorrectIce machine does not operate.No electrical power to the ice machine.Replace the fuse/reset the breaker/turnon the main switch/plug power cord intoreceptacle.Ice machine needs to be turned on. Press the On/Off button to start ice making.Damper in open position (down). Damper must be in upright position andcapable of swinging freely.Ice machine stops, and can be restarted byturning the ice machine OFF and then ON. Safety limit feature stopping the ice machine. Refer to “Safety Limit Feature” on the nextpage.Ice sheet is thick.Water trough level is too high. Adjust ice thickness float.Power button was turned off/on during freezecycle and ice remained on evaporator.Allow ice to thaw and release fromevaporator, then restart.Ice damper was opened then closed in theharvest cycle before the ice released.Allow ice to thaw and release fromevaporator, then restart.Long harvest cycles with repeated safety limitindication. Call for service.Ice machine does not release ice or is slow toharvest.Ice machine is dirty. Clean and sanitize the ice machine.Ice machine is not level. Level the ice machine.Low air temperature around ice machine (air-cooled models). Air temperature must be at least 40°F (4°C).Water regulating valve leaks in harvest mode(water-cooled models). Replace water regulating valve.Ice machine does not cycle into harvestmode.The six-minute freeze time lock-in has notexpired yet. Wait for freeze lock-in to expire.Harvest float switch is dirty. Clean and sanitize the ice machine.Harvest float switch wire is disconnected. Connect the wire.Harvest float switch is out of adjustment. Adjust the harvest float switch.Uneven ice fill (thin at top of evaporator). See “Shallow or Incomplete Cubes” below.Ice quality is poor (soft or not clear).Poor incoming water quality.Contact a qualified service company to testthe quality of the incoming water and makeappropriate filter recommendations.Water filtration is poor. Replace the filter.Ice machine is dirty. Clean and sanitize the ice machine.Water softener is working improperly (ifapplicable). Repair the water softener.Ice machine produces shallow or incompletecubes, or the ice fill pattern on the evaporatoris incomplete.Ice thickness switch is out of adjustment. Adjust the ice thickness switch.Water trough level is too high or too low. Check the water level.Water filtration is poor. Replace the filter.Hot incoming water. Connect the ice machine to a cold watersupply.Incorrect incoming water pressure. Water pressure must be 20 – 80 psi (137.9 –551.5 kPa)Ice machine is not level. Level the ice machine.Section 5Troubleshooting

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