Manitowoc Ice STH003 manual ICE Machine will not Harvest

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ICE MACHINE WILL NOT HARVEST

1.Verify cubes are present in evaporator and freeze time exceeds freeze chart cycle time.

•Initial freeze cycle after resetting at toggle switch will be 5 minutes longer than chart time (refer to Sequence of Operation).

•Verify control board is not set for additional freeze time to fill out the ice cubes, see cube weight adjustment.

2.Observe control board light:

•Steady light indicates thermistor operation is normal.

•Slow flash indicates a thermistor problem (open or disconnected). Verify liquid line thermistor is connected to control board, securely attached to liquid line and insulated. Refer to resistance chart and Ohm thermistor.

•Rapid flash indicates liquid line temperature exceeded 170°F (refer to discharge pressure high checklist). If unable to determine cause, refer to resistance chart and Ohm thermistor.

3.Reset ice machine.

•Wait freeze cycle time plus an addition 5 minutes (refer to Sequence of Operation).

4.Verify the water inlet valve is energized during the entire harvest cycle and water flow is normal.

•Although the hot gas valve is energized, the ice machine will not consistently harvest if the water inlet valve does not energize or has low water flow.

5.Check for power at the hot gas valve

•Power is present - replace coil/valve.

•No power at hot gas valve - check for power at circuit board connector, replace control board if no power is present.

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Contents CM050 CM Model Ice Machines Safety Notices Procedural Notices Personal Injury Potential Read These Before ProceedingPotential Personal Injury Situation Table of Contents Liquid Line Thermistor Model Numbers CMS050A004Manitowoc ICE Machine Cleaner and Sanitizer Accessories LegsDrain Pump MODEL/SERIAL Number Location General Owner Warranty Registration CardPage Manitowoc ICE, INC Location of ICE Machine InstallationHeat of Rejection Air Conditioning** Peak ICE Machine Heat of RejectionLevelers Legs Leveling the ICE MachineWater Inlet Lines Water SERVICE/DRAINS Water SupplyDrain Connections Water Supply and Drain Line SIZING/CONNECTIONS Drain PumpGfci Requirements Electrical SpecificationsElectrical Requirements Voltage Minimum Circuit AmpacityComponent Identification Water Pump Evaporator Shutter Assembly Operational Checks BIN Thermostat AdjustmentPower Button Green Clean GreenSafety Timers ICE Machine Inspection Cleaning the CondenserAIR-COOLED Condenser Interior Cleaning and Sanitizing Place CLEANING/SANITIZING Procedure Interior Cleaning and Sanitizing GeneralPage Cleaning Procedure Page Page Removal of Parts for Cleaning and Sanitizing TOP Cover Water Shutters ICE Chute Sump Drain Overflow Tube Water Trough Spray BAR, Water Pump and Hose Spray BAR Disassembly SELF-CONTAINED AIR-COOLED ICE Machines Removal from SERVICE/LONG Term STORAGE/WINTERIZATION GeneralAutomatic Shut-Off Refrigeration System Start-UpFreeze HarvestSequence Energized Parts Chart SELF-CONTAINED ICE MachinesDiagnosing AN ICE Machine That will not RUN TroubleshootingPage ICE Machine will not Harvest ICE Quality is Poor Cubes are SHALLOW, Incomplete or White Freeze Cycle is LONG, LOW ICE Production ICE Machine Runs & no ICE is Produced Freeze Harvest Cycle Psig Beginning Freeze Cycle Discharge Pressure LOW Checklist Analyzing Suction Pressure Step ProcedureSuction Pressure LOW Checklist Problem Suction Pressure High Checklist ProblemDischarge Pressure General HOT GAS ValveNormal Operation HOT GAS Valve Analysis Freeze cycle. If Function SpecificationsNo Ice on Ice on Bulb Result Check ProcedureFreeze Time Harvest Time Total Cycle Time Additional finishing time check Adjusting Finishing TimeLiquid Line Thermistor SM50 Resistance Chart TEMPERATURE/RESISTANCE ChartTotal System Refrigeration Charge Component Specifications Check Procedures Check Motor Windings to Ground Compressor Electrical DiagnosticsSingle Phase Compressors Check Resistance OHM ValuesCompressor Drawing High Amps Compressor Drawing Locked RotorRelay CapacitorPage Cycle Times Freeze Time + Harvest Time = Cycle Time Reclaim RecoverNew Product Specifications RecycleRefrigerant RE-USE Policy Page Connections Refrigerant Recovery/Evacuation/ChargingRecovery/Evacuation Charging Procedures Page System Contamination Cleanup General No symptoms or suspicion Normal Mild System Contamination Cleanup Procedure Change the vacuum pump oil Severe System Contamination Cleanup ProcedureFollow normal evacuation procedures Page FIG. a Pinching OFF Tubing Using Pinch Off ToolDo not disassemble valve Brazing Procedures for Danfoss Solenoid ValvesMAX F 700C Liquid Line Filter Drier Control Board Wiring Diagrams Tubing Schematic Manitowoc Ice, Inc