Hoshizaki KM-650MWH, KM-650MAH, KM-650MRH service manual Problem Possible Cause Remedy

Page 35

Problem

Possible Cause

 

Remedy

 

 

 

 

[5] No water comes from

c) Water System

2. Clogged.

2. Clean.

spray tubes. Water

(continued)

 

 

3. Pump out check valve

3. Check assembly and

pump will not start, or

 

 

leaking by.

clean.

freeze cycle time is

 

 

 

 

d)Pump Motor

1. Motor winding opened.

1. Replace.

too short. (continued)

 

 

 

 

 

 

2. Bearing worn out.

2. Replace.

 

 

 

 

 

 

3. Wiring to pump motor.

3. Check for loose

 

 

 

connection or open, and

 

 

 

replace.

 

 

 

 

 

 

4. Defective capacitor.

4. Replace.

 

 

 

 

 

 

5. Defective or bound

5. Replace and clean.

 

 

impeller.

 

 

 

 

 

 

 

6. Mechanical seal worn

6. Check and replace.

 

 

out.

 

 

 

 

 

 

e)Control Board

1. Defective.

1. See "II.C.4. Control Board

 

 

 

Check Procedure."

 

 

 

 

[6] Fan motor will

a)Fan Motor

1. Motor winding opened.

1. Replace.

not start, or is not

 

 

 

operating.

 

2. Bearing worn out.

2. Replace.

 

 

 

 

 

 

3. Wiring to fan motor.

3. Check for loose

 

 

 

connection or open, and

 

 

 

replace.

 

 

 

 

 

 

4. Defective capacitor.

4. Replace.

 

 

 

 

 

 

5. Fan blade bound.

5. Check and replace.

 

 

 

 

 

b)Control Board

1. Defective.

1. See "II.C.4. Control Board

 

 

 

Check Procedure."

 

 

 

 

[7] All components

a)Refrigerant

1. Undercharged.

1. Check for leaks and

run, but no ice is

 

 

recharge.

produced.

 

 

 

 

2. Air or moisture

2. Replace drier and

 

 

 

 

trapped.

recharge.

 

 

 

 

 

b)Compressor

1. Defective valve.

1. Replace.

 

 

 

 

 

c) Hot Gas Valve

1. Continues to open in

1. Check and replace.

 

 

freeze cycle.

 

 

 

 

 

 

d)Line Valve

1. Continues to close in

1. Check and replace.

 

 

freeze cycle.

 

 

 

 

 

 

e)Inlet Water Valve

1. Water valve is wide

1. Check for water leaks with

 

 

open during freeze.

icemaker off.

 

 

 

 

 

f) Headmaster (C.P.R.)

1. Not operating properly

1. Replace headmaster.

 

(Remote Unit)

and liquid line

 

 

 

temperature too warm.

 

 

 

 

 

 

g)Water Supply Line

1. Condenser water

1. Check and get

 

(water-cooled model

pressure too low or off

recommended pressure.

 

only)

and pressure control

 

 

 

opens and closes

 

 

 

frequently.

 

 

 

 

 

 

h)Water Regulator

1. Set too high.

1. Adjust or replace. See

 

(water-cooled model

 

"V.I. Adjustment of Water

 

only)

 

Regulating Valve."

 

 

 

 

35

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Contents KM-650MAH KM-650MWH KM-650MRH Hoshizaki AMERICA, INC Contents Page KM-650MAH air-cooled Specifications IcemakerWater Cooled Condenser KM-650MWH water-cooledKM-650MRH remote air-cooled URC-5F Condensing UnitModel URC-5F SpecificationsII. General Information Construction KM-650MWH water-cooled KM-650MRH remote air-cooled Sequence of Operation Cycle Steps Harvest Cycle Freeze Cycle One Minute Control Board Control Board Control Products E Control BoardControl Board Layout Maximum Water Supply Period 6 minutes FeaturesLED Lights and Audible Alarm Safeties Default Dip Switch Settings Controls and AdjustmentsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Replacement Control Board Check ProcedureKM-650MAH air-cooled KM-650MWH water-cooled KM-650MRH remote air-cooled KM-650MAH air-cooled and KM-650MWH water-cooled Wiring DiagramsPsig 108 Performance Data680 615 IV. Service Diagnosis Minute KM Diagnostic Procedure No Ice Production Diagnostic ChartsProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Other Low Ice ProductionAbnormal Ice Problem Possible Cause Remedy Evacuation and Recharge R-404A Removal and Replacement of ComponentsService for Refrigerant Lines Refrigerant RecoveryBrazing Removal and Replacement of CompressorRemoval and Replacement of Drier Removal and Replacement of Expansion Valve Removal and Replacement of Hot Gas Valve and Line Valve Removal and Replacement of Evaporator Adjustment of Water Regulating Valve Water-Cooled Model Only Page Removal and Replacement of Fan Motor Removal and Replacement of ThermistorRemoval and Replacement of Pump Motor Removal and Replacement of Inlet Water ValveRemoval and Replacement of Spray Tubes Cleaning and Sanitizing Procedures VI. Cleaning and Maintenance InstructionsCleaning Procedure Stainless Steel Exterior MaintenanceSanitizing Procedure Following Cleaning Procedure Condenser air-cooled and remote air-cooled models only Preparing the Icemaker for Long StorageStorage Bin and Scoop Air Filters air-cooled models onlyDrain the potable water tank Drain the potable water supply line
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