Hoshizaki KM-1300MAH IV. Service Diagnosis No ICE Production, Problem Possible Cause Remedy

Page 37

IV. SERVICE DIAGNOSIS

1. NO ICE PRODUCTION

PROBLEM

POSSIBLE CAUSE

 

REMEDY

[1] The icemaker

a) Power Supply

1.

“OFF” position.

1.

Move to “ON” position

 

will not start

 

 

2.

Loose connections.

2.

Tighten

 

 

 

 

3.

Bad contacts.

3.

Check for continuity and

 

 

 

 

 

 

replace.

 

 

 

 

 

 

 

 

 

 

4.

Voltage too high.

4.

Check and get

 

 

 

 

 

 

recommended voltage.

 

b) Fuse (Inside Fused

1.

Blown out.

1. Check for short circuit

 

 

Disconnect, if any)

 

 

 

and replace

 

 

 

 

 

 

 

c) Control Switch

1.

“OFF” position.

1.

Move to “ICE” position.

 

 

 

2.

Bad contacts.

2.

Check for continuity and

 

 

 

 

 

 

 

replace.

 

 

 

 

 

 

 

d) Bin Control

1.

Tripped with bin filled

1.

Remove ice.

 

Thermostat

 

with ice.

 

 

 

 

 

 

2. Ambient temperature

2. Increase ambient

 

 

 

 

 

too cool.

 

temperature.

 

 

 

 

3.

Set too warm.

3.

See “II.2.[d]

 

 

 

 

 

 

CONTROLS AND

 

 

 

 

 

 

ADJUSTMENTS, 5) Bin

 

 

 

 

 

 

Control.”

 

 

 

 

4.

Bulb out of position.

4.

Place in position.

 

 

 

 

 

 

 

 

 

 

 

5.

Bad contacts or leak in

5.

Check for continuity and

 

 

 

 

bulb.

 

replace.

 

e) High Pressure

1.

Bad contacts.

1.

Check for continuity and

 

Control

 

 

 

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 and

 

Controller Board

 

open.

 

replace.

 

 

 

 

 

 

 

h) Thermistor

1.

Leads short-circuit or

1.

See “II.2.[d] CONTROLS

 

 

 

 

open and High

 

AND ADJUSTMENTS, 1)

 

 

 

 

Temperature Safety

 

Defrost Control.”

 

 

 

 

operates.

 

 

 

 

 

 

 

 

 

i) Hot Gas Solenoid

1.

Continues to open in

1. Check for power off in

 

Valve

 

freeze cycle and High

 

freeze cycle and replace.

 

 

 

 

Temperature Safety

 

 

 

 

 

 

 

operates.

 

 

 

 

j) Water Supply Line

1.

Water supply off and

1.

Check and get

 

 

 

 

water supply cycle does

 

recommended

 

 

 

 

not finish.

 

pressure.

 

 

 

 

2. Condenser water

2.

Check and get

 

 

 

 

pressure too low or off

 

recommended

 

 

 

 

and Pressure Control

 

pressure.

 

 

 

 

opens and closes fre-

 

 

 

 

 

 

 

quently to finally operate

 

 

 

 

 

 

 

High Temperature Safety.

 

 

 

 

k) Water Solenoid

1.

Mesh filter or orifice gets

1.

Clean.

 

 

 

 

clogged and water supply

 

 

 

 

 

 

 

cycle does not finish.

 

 

 

 

 

 

2.

Coil winding opened.

2.

Replace.

 

 

 

3.

Wiring to Water Valve.

3.

Check for loose

 

 

 

 

 

 

connection or open, and

 

 

 

 

 

 

replace.

 

 

 

 

 

 

 

 

37

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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 BoardSOLID-STATE Control Controller BoardPage Minute Fill Cycle Beep every 3 sec. = High Evaporator Temperature 127 FHarvest Cycle Freeze 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 ICERefrigerant Recovery Service for Refrigerant LinesEvacuation 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