Hoshizaki KM-1300MWH, KM-1300MAH, KM-1300MRH service manual Problem Possible Cause Remedy

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PROBLEM

 

POSSIBLE CAUSE

 

REMEDY

 

 

 

 

 

 

 

 

 

 

[5] No water

 

a) Water Supply Line

1.

Water pressure too low and

1.

Check and get

comes from

 

 

 

 

 

water level in Water Tank

 

recommended pressure.

Spray Tubes.

 

 

 

 

 

too low.

 

 

 

Water Pump

 

b) Water Solenoid

1.

Dirty mesh filter or orifice

1.

Clean.

 

will not start, or

 

Valve

 

 

and water level in Water

 

 

 

freeze cycle

 

 

 

 

 

Tank too low.

 

 

 

time is too

 

c) Water System

1.

Water leaks.

1.

Check connections for

short.

 

 

 

 

 

 

 

water leaks, and replace.

 

 

 

 

 

2. Clogged.

2.

Clean.

 

 

d) Pump Motor

 

1. Motor winding opened.

1. Replace.

 

 

 

 

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 impeller.

5. Replace and clean.

 

 

 

 

6.

Mechanical Seal worn out.

6.

Check and replace.

 

 

e) Controller Board

1.

Defective.

1.

See “II.2. [e] CHECKING

 

 

 

 

 

 

 

 

CONTROLLER BOARD.”

[6] Fan Motor will

 

a) Fan Motor

 

1. Motor winding opened.

1. Replace.

not start, or is

 

 

 

2.

Bearing worn out.

2.

Replace.

not operating.

 

 

 

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) Controller Board

1.

Defective.

1.

See “II.2. [e] CHECKING

 

 

 

 

 

 

 

 

CONTROLLER BOARD.”

[7] All components

a) Refrigerant

 

1. Undercharged.

1.

Check for leaks and

run but no ice

 

 

 

 

 

 

 

recharge.

is produced.

 

 

 

2.

Air or moisture trapped.

2.

Replace Drier, and

 

 

 

 

 

 

 

 

recharge.

 

 

b) Compressor

1.

Defective valve.

1. Replace.

 

 

c) Hot Gas Solenoid

1.

Continues to open in freeze

1.

Check and replace.

 

 

Valve

 

 

cycle.

 

 

 

 

 

d) Line Valve

1.

Continues to close in

1.

Check and replace

 

 

 

 

 

 

freeze cycle.

 

 

 

 

 

 

 

 

 

 

 

 

e) Water Supply Line

1.

Condenser water pressure

1.

Check and get

 

 

[Water-cooled model

 

 

too low or off and Pressure

 

recommended pressure.

 

 

only]

 

 

Control opens and closes

 

 

 

 

 

 

 

 

 

frequently.

 

 

 

 

 

 

 

 

 

 

 

 

 

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Contents KM-1300MAH KM-1300MWH KM-1300MRH Hoshizaki AMERICA, INC Contents Maintenance KM-1300MAH Air-cooled Specifications2a. KM-1300MWH Water-cooled 2b. KM-1300MWH Water-cooled Serial No. M10156D KM-1300MRH Remote air-cooled Condensing Unit URC-12F Specifications Model URC-12F II. General Information Construction KM-1300MWH Water-cooled KM-1300MRH Remote air-cooled Controller Board Features of Control Products E Controller BoardController Board SOLID-STATE ControlPage Freeze Cycle Beep every 3 sec. = High Evaporator Temperature 127 FMinute Fill Cycle Harvest CycleControl Products HOS-001A Board Sequence 1st Cycle 2nd Cycle and after with pump drain 2nd Cycle and after with no pump drain Controls and Adjustments Setting Time Setting Frequency Checking the Controller Board Page III. Technical Information KM-1300MWH Water-cooled KM-1300MRH Remote air-cooled KM-1300MAH Air-cooled and KM-1300MWH Water-cooled Wiring DiagramsCut-out 412 ±21.3 Psig Cut-in 327±21.3 Psig Timing Chart Page Performance Data Serial # L00001F to M10155C KM-1300MWH Water-cooled Serial # M10156D KM-1300MRH Remote air-cooled Problem Possible Cause Remedy IV. Service Diagnosis No ICE ProductionController Board Problem Possible Cause Remedy LOW ICE Production Evaporator is Frozen UPOthers Abnormal ICEService for Refrigerant Lines Refrigerant RecoveryEvacuation and Recharge R-404A Brazing Removal and Replacement of Compressor Important Removal 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 Important Page Page Page Removal and Replacement of Thermistor Important Removal and Replacement of FAN Motor Removal and Replacement of Pump Motor Removal and Replacement of Water ValveRemoval and Replacement of Spray Tubes Preparing the Icemaker for Long Storage VI. Maintenance and Cleaning InstructionsPage Cleaning Cleaning Procedure Sanitizing Procedure Following Cleaning Procedure Page Maintenance