Hoshizaki HUR68A(-D), HWR40A(-D), HUR96A(-D) Diagnosis Chart, Problem Possible Cause Remedy

Page 42

B. Diagnosis Chart

Problem

Possible Cause

 

Remedy

[1]

Compressor will

a)Power Supply

1. "OFF" position.

1. Move to "ON" position.

 

not start—no

 

2. Loose connection(s).

2. Tighten or reconnect.

 

current draw.

 

 

 

 

 

3. Failure.

3. Call electrician.

 

 

 

 

 

b) Cord and Plug

1. Defective.

1. Replace.

 

 

 

 

 

 

 

c) Circuit Breaker

1. Tripped.

1. Check and reset. Call

 

 

(kitchen)

 

electrician if breaker trips

 

 

 

 

repeatedly.

 

 

 

2. Defective.

2. Call electrician.

 

 

d)Transformer

1. Open coil winding.

1. Check continuity and replace.

 

 

e)Wiring to Control Board

1. Loose connection(s).

1. Tighten.

 

 

 

2. Faulty.

2. Check continuity and replace.

 

 

f) Voltage

1. Too low.

1. Call electrician.

 

 

 

 

 

 

 

 

2. Too high.

2. Call electrician.

 

 

g)High Pressure Switch

1. Bad contacts.

1. Check continuity and replace.

 

 

 

2. Has operated 5 or

2. Determine why pressure

 

 

 

more times in one

switch is activated.

 

 

 

hour. (E4 should be

 

 

 

 

displayed)

 

 

 

h)Thermistor

1. Defective.

1. Check and replace.

 

 

i) Control Board

1. Defective.

1. Replace control board.

 

 

j) Compressor Overload

1. Defective. (Contacts

1. Replace.

 

 

 

open)

 

 

 

k) Compressor

1. Open windings.

1. Check continuity and replace.

 

 

l) Relay (Condensing

1. Bad contacts.

1. Replace.

 

 

Unit)

2. Open coil winding.

2. Check and replace.

[2]

Compressor will

a)Voltage

1. Too low.

1. Call electrician.

 

not run—draws

b)Start Relay

1. Bad contacts.

1. Replace.

 

current and trips

 

 

 

 

 

2. Open coil windings.

2. Replace.

 

on overload.

 

 

c) Compressor

1. Locked rotor.

1. Replace.

 

 

 

 

d)Start Capacitor

1. Defective.

1. Check and replace.

[3]

Compressor runs

a)Voltage

1. Too low.

1. Call electrician.

 

intermittently and

 

2. Too high.

2. Call electrician.

 

trips on overload.

 

 

 

 

b)Condenser Filter

1. Clogged.

1. Clean filter.

 

 

c) Refrigerant Line or

1. Plugged or restricted.

1. Clean and replace drier. Clean

 

 

Component

 

and replace capillary tube heat

 

 

 

 

exchanger assembly.

 

 

d)Condenser Fan Motor

1. Failed.

1. Replace.

 

 

e)Refrigerant

1. Overcharged.

1. Evacuate and recharge.

 

 

 

2. Non-condensibles in

2. Evacuate and recharge.

 

 

 

system.

 

 

 

f) Location of Unit

1. Restricted air flow to

1. Move unit or increase

 

 

 

condenser.

ventilation.

[4]

Cabinet

a)Thermistor

1. Defective.

1. Check and replace.

 

temperature too

b)Compressor Relay

1. Defective.

1. Check and replace.

 

high; compressor

 

 

 

 

c) Control Board

1. Defective.

1. Replace.

 

will not start.

 

 

 

 

 

 

 

 

42

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Contents Superior Degree Reliability Energy Star Contents Page Specifications Nameplate Ratings DimensionsUndercounter Model Names HUR40A, HUF40A Units mm 1a. HUR40A-D, HUF40A-D HWR40A, HWF40A 2a. HWR40A-D, HWF40A-DHUR68A, HUF68A 3a. HUR68A-D, HUF68A-DHWR68A, HWF68A 4a. HWR68A-D, HWF68A-DHUR96A Units mm 5a. HUR96A-D HWR96A Units mm 6a. HWR96A-D II. General Information Construction Evaporator CaseSequence of Operation and Timing Charts Refrigerators Continuous Operating ModeSequence of Operation Timing Chart OperatingFreezers Continuous Operating Mode Freezers Continuous Refrigerators Energy Saving Operating Mode Defrost End Defrost thermistor reaches defrostEnergy Freezers Energy Saving Operating Mode Board Self Check Minute DelayFreezers Energy Start-Up Delay Control BoardRear Relay Wiring Harness K311Thermistor Wiring Harness K151 FrontSettings and Diagnostics Gaining Access to Settings and DiagnosticsTemperature Display Switching the Display Between Fahrenheit and Celsius F5Adjusting the Setpoint Temperature Cabinet Temperature Correction calibration factor Settings and Diagnostics Menu Later SectionDefrost Termination Temperature F1 Defrost Interval F0Setpoint Temperature Differential F2 High Temperature Alarm Delay Time F3 Low Temperature Alarm Delay Time F4Temperature Display Scale F5 Alarm History F6Compressor Run Time F7 Operating ModesPerimeter Frame Heater ContinuousEnergy Saving III. Service Diagnosis Alarm Codes Alarm Signals Alarm Code ProblemAlarm Display Priority Error Code Priority DescriptionReset Options Alarm Details and CountermeasuresHigh Temperature Alarm E1 Possible CausesLow Temperature Alarm E2 Defrost Alarm E3 High Pressure Alarm E4Clogged Filter Alarm E7 Defrost Temperature Sensor Malfunction Alarm E8 Clogged Filter Sensor Malfunction Alarm E9 Control Board Error Alarms EA and ED Diagnosis Chart Problem Possible Cause RemedyProblem Possible Cause Remedy Problem Possible Cause Remedy Thermistor Check Refrigerant Recovery IV. Removal and Replacement of ComponentsService for Refrigerant Lines BrazingEvacuation and Recharge Removal and Replacement of Refrigeration Unit Removal and Replacement of CompressorRemoval and Replacement of Evaporator Page Page Defrost Thermistor Removal and Replacement of ThermistorsCabinet Thermistor Clogged Filter Thermistor sensorRemoval and Replacement of Door Gasket Removal and Replacement of Defrost HeaterRemoval and Replacement of Control Board Condenser Fan Motor Removal and Replacement of Fan MotorsDoor Re-Hinging and Drawer Conversion Evaporator Fan MotorCleaning and Maintenance Instructions CleaningShelves MaintenanceAir Filter Drawers115/60/1 A2. HUR40A-D, HWR40A-D auxiliary code Q6 and later HUF40A-D, HWF40A-D C1. HUR68A, HWR68A auxiliary code Q5 and earlier C2. HUR68A-D, HWR68A-D auxiliary code Q6 and later HUF68A-D, HWF68A-D HUR96A-D, HWR96A-D
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