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

Page 34

Problem

Possible Cause

 

Remedy

 

 

 

 

[1] The icemaker will not

m)Interlock Switch

1. OFF position.

1. Move to ON position.

start. (continued)

(Cleaning Valve)

 

 

 

 

 

 

 

 

2. Bad contacts.

2. Check for continuity and

 

 

 

replace.

 

 

 

 

 

n)Wash Switch

1. WASH position.

1. Move to ICE position.

 

 

 

 

 

 

2. Bad contacts.

2. Check and replace.

 

 

 

 

[2] Water continues to

a)Float Switch

1. Connector

1. Place in position.

be supplied, and the

 

disconnected.

 

icemaker will not

 

 

 

 

2. Leads opened or

2. Check and replace.

start.

 

 

defective switch.

 

 

 

 

 

 

 

 

 

 

3. Float does not move

3. Clean or replace.

 

 

freely.

 

 

 

 

 

 

b)Control Board

1. Defective.

1. Replace.

 

 

 

 

[3] Compressor will

a)Magnetic Contactor

1. Bad contacts.

1. Check for continuity and

not start or stops

 

 

replace.

operating.

 

 

 

 

2. Coil winding opened.

2. Replace.

 

 

 

 

 

 

 

b)Start Capacitor or Run

1. Defective.

1. Replace.

 

Capacitor

 

 

 

 

 

 

 

c) Internal Overload

1. Loose terminal.

1. Tighten or replace.

 

Protector Open (check

 

 

 

1 through 3 to the right

2. Voltage.

2. Check and correct.

 

and d through f below)

 

 

 

3. Dirty condenser.

3. Clean.

 

 

 

 

 

d)Starter

1. Bad contacts.

1. Check and replace.

 

 

 

 

 

 

2. Coil winding opened.

2. Replace.

 

 

 

 

 

e)Compressor

1. Wiring to compressor.

1. Check for loose

 

 

 

connection or open, and

 

 

 

replace.

 

 

 

 

 

 

2. Defective.

2. Replace.

 

 

 

 

 

 

3. Protector tripped.

3. Reduce temperature.

 

 

 

 

 

f) Control Board

1. No power to contactor.

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

 

 

 

Check Procedure."

 

 

 

 

[4] Water continues to

a)Inlet Water Valve

1. Diaphragm does not

1. Check for water leaks with

be supplied in freeze

 

close.

icemaker off.

cycle.

 

 

 

b)Control Board

1. Defective.

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

 

 

 

 

Check Procedure."

 

 

 

 

[5] No water comes from

a)Water Supply Line

1. Water pressure too

1. Check and get

spray tubes. Water

 

low and water level in

recommended pressure.

pump will not start, or

 

water tank too low.

 

freeze cycle time is

 

 

 

b)Inlet Water Valve

1. Dirty mesh filter or

1. Clean.

too short.

 

orifice and water level

 

 

 

 

 

 

in water tank too low.

 

 

 

 

 

 

c) Water System

1. Water leaks.

1. Check connections for

 

 

 

water leaks, and replace.

 

 

 

 

34

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Contents KM-650MAH KM-650MWH KM-650MRH Hoshizaki AMERICA, INC Contents Page Specifications Icemaker KM-650MAH air-cooledKM-650MWH water-cooled Water Cooled CondenserKM-650MRH remote air-cooled Condensing Unit URC-5FSpecifications Model URC-5FII. 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 Layout Control Products E Control BoardControl Board Features Maximum Water Supply Period 6 minutesLED Lights and Audible Alarm Safeties Controls and Adjustments Default Dip Switch SettingsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Check Procedure Control Board ReplacementKM-650MAH air-cooled KM-650MWH water-cooled KM-650MRH remote air-cooled Wiring Diagrams KM-650MAH air-cooled and KM-650MWH water-cooledPsig Performance Data 108680 615 IV. Service Diagnosis Minute KM Diagnostic Procedure Diagnostic Charts No Ice ProductionProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Abnormal Ice Low Ice ProductionOther Problem Possible Cause Remedy Refrigerant Recovery Removal and Replacement of ComponentsService for Refrigerant Lines Evacuation and Recharge R-404ARemoval and Replacement of Compressor BrazingRemoval 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 Thermistor Removal and Replacement of Fan MotorRemoval and Replacement of Inlet Water Valve Removal and Replacement of Pump MotorRemoval and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Cleaning and Sanitizing ProceduresCleaning Procedure Sanitizing Procedure Following Cleaning Procedure MaintenanceStainless Steel Exterior Air Filters air-cooled models only Preparing the Icemaker for Long StorageStorage Bin and Scoop Condenser air-cooled and remote air-cooled models onlyDrain the potable water supply line Drain the potable water tank
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