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IV. SERVICE DIAGNOSIS1. NO ICE PRODUCTIONPROBLEM POSSIBLE CAUSE REMEDY[1] The icemaker a) Power Supply 1. “OFF” position. 1. Move to “ON” positionwill not start 2. Loose connections. 2. Tighten3. Bad contacts. 3. Check for continuity andreplace.4. Voltage too high. 4. Check and getrecommended voltage.b) Fuse (Inside Fused 1. Blown out. 1. Check for short circuitDisconnect, if any) and replacec) Control Switch 1. “OFF” position. 1. Move to “ICE” position.2. Bad contacts. 2. Check for continuity andreplace.d) Bin Control 1. Tripped with bin filled 1. Remove ice.Thermostat with ice.2. Ambient temperature 2. Increase ambienttoo cool. temperature.For mechanicalbin controlsee “II. 3. [c]”3. Set too warm. 3. See “II.2.[d]CONTROLS ANDADJUSTMENTS, 5) BinControl.”4. Bulb out of position. 4. Place in position.5. Bad contacts or leaks 5. Check for continuity andbulb. replace.e) High Pressure 1. Bad contacts. 1. Check for continuity andControl replace.f) Transformer 1. Thermal fuse blown out 1. Replace.or coil winding opened.g) Wiring to 1. Loose connections or 1. Check for continuity andController Board open. replace.h) Thermistor 1. Leads short-circuit or 1. See “II.2.[d] CONTROLSopen and High AND ADJUSTMENTS, 1)Temperature Safety Defrost Control.”operates.i) Hot Gas Solenoid 1. Continues to open in 1. Check for power off inValve freeze cycle and High freeze cycle and replace.Temperature Safetyoperates.j) Water Supply Line 1. Water supply off and 1. Check and getwater supply cycle does recommended pressure.not finish.2. Condenser water pressure 2. Check and gettoo low or off and Pressure recommended pressure.Control opens and closesfrequently to finally operateHigh Temperature Safety.k) Water Solenoid 1. Mesh filter or orifice gets 1. Clean.clogged and water supplycycle does not finish.2. Coil winding opened. 2. Replace.3. Wiring to Water Valve. 3. Check for loose connectionor open, and replace.48
PROBLEM POSSIBLE CAUSE REMEDYl) Controller Board 1. Defective 1. See “II.2[e] CHECKINGCONTROLLER BOARD.”m) Interlock Switch 1. “OFF” position. 1. Move to “ON” position.(Cleaning Valve) 2. Bad contacts. 2. Check for continuity andreplace.[2] Water a) Float switch 1. Connector disconnected. 1. Place in position.continues to 2. Leads opened or defective 2. Check and replace.be supplied, switch.and the ice- 3. Float does not move freely. 3. Clean or replace.maker will not b) Controller Board 1. Defective. 1. Replace.start.[3] Compressor a) Wash Switch 1. “WASH” position. 1. Move to “ICE” position.will not start 2. Bad contacts. 2. Check and replace.or operates b) High Pressure 1. Dirty Air Filter or 1. Clean.intermittently. Control Condenser.2. Ambient or condenser 2. Reduce ambient temp.water temp. too warm.3. Refrigerant overcharged. 3. Recharge.4. Condenser water pressure 4. Check and gettoo low or off. [Water- recommended pressure.cooled model only].5. Fan not operating. [Except 5. See chart 1 - [6].water-cooled model].6. Refrigerant line or 6. Clean and replace Drier.components plugged.c) Water Regulator 1. Set too high. 1. Adjust lower.d) Overload Protector 1. Bad contacts. 1. Check for continuity andreplace.2. Voltage too low. 2. Increase voltage.3. Refrigerant overcharged or 3. Recharge.undercharged.4. Line Valve continues to 4. Check Line Valve'sclose in freeze cycle and operation in freeze cycleOverload Protector and replace.operates.e) Starter 1. Bad contacts. 1. Check and replace.2. Coil winding opened. 2. Replace.f) Start Capacitor or 1. Defective. 1. Replace.Run Capacitorg) Magnetic Contactor 1. Bad contacts. 1. Check for continuity andreplace.2. Coil winding opened. 2. Replace.h) Compressor 1. Wiring to Compressor. 1. Check for looseconnection or open, andreplace.2. Defective. 2. Replace.3. Protector tripped. 3. Reduce temperature.i) Controller board 1. Defective. 1. See “II.2. [e] CHECKINGCONTROLLER BOARD.”j) Discharge Temp. 1. Refrigerant 1. Recharge.Switch undercharged.2. Cooling Fan not operating. 2. See chart 1 - [6]49
Page 1 and 2: 73105
Page 3 and 4: Please review this manual. It shoul
Page 5 and 6: I. SPECIFICATIONS1. KM-900MAHAC SUP
Page 7 and 8: 2b. KM-900MWHBeginning Serial No. M
Page 9 and 10: 4. KM-900MRH3AC SUPPLY VOLTAGE 208-
Page 11 and 12: SPECIFICATIONSMODEL: URC-12FEXTERIO
Page 13 and 14: [b] KM-900MWHModels with Thermostat
Page 15 and 16: [d] KM-900MRH3Models with Thermosta
Page 17 and 18: 2) Defrost TimerThe defrost cycle s
Page 19 and 20: The application switch located betw
Page 21 and 22: 2nd Cycle and after with pump drain
Page 23 and 24: [d] CONTROLS AND ADJUSTMENTSThe Dip
Page 25 and 26: 2) Defrost TimerNo adjustment is re
Page 27 and 28: MODELS WITH MECHANICAL BIN CONTROLC
Page 29 and 30: [c] TROUBLESHOOTING (MECHANICAL BIN
Page 31 and 32: [b] KM-900MWH31
Page 33 and 34: 2. WIRING DIAGRAMS[a] KM-900MAH (Wi
Page 35 and 36: [b] KM-900MWH (With Mechanical Bin
Page 37 and 38: [c] KM-900MRH (With Mechanical Bin
Page 39 and 40: [d] KM-900MRH3 (With Mechanical Bin
Page 41: 3. TIMING CHART41
Page 44 and 45: [b] KM-900MWHMODEL: KM-900 MWHBegin
Page 46 and 47: [d] KM-900MRHAPPROXIMATE ICEPRODUCT
Page 50 and 51: PROBLEM POSSIBLE CAUSE REMEDY[4] Wa
Page 52 and 53: 4. ABNORMAL ICEPROBLEM POSSIBLE CAU
Page 54 and 55: 5) Disconnect the Vacuum Pump, and
Page 56 and 57: 15) Evacuate the system, and charge
Page 58 and 59: 3) Recover the refrigerant and stor
Page 60 and 61: 7. REMOVAL AND REPLACEMENT OF EVAPO
Page 62 and 63: 9. ADJUSTMENT OF WATER REGULATING V
Page 64 and 65: 11. REMOVAL AND REPLACEMENT OF THER
Page 66 and 67: 13. REMOVAL AND REPLACEMENT OF WATE
Page 68 and 69: VI. MAINTENANCE AND CLEANING INSTRU
Page 70 and 71: 2. CLEANINGIMPORTANTEnsure all comp
Page 72 and 73: 20) Turn on the power supply to fil

6(59,&( 0$18$/ km-900mah km-900mwh km-900mrh km-900mrh3 ...

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