Hoshizaki HUR40A(-D) III. Service Diagnosis Alarm Codes, Alarm Signals Alarm Code Problem

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III. Service Diagnosis

A. Alarm Codes

If an error occurs, the alarm code and cabinet temperature are displayed in 1-second intervals. See the table below for a general description of the problem, then see the rest of this section for detailed instructions.

Alarm Signals

Alarm Code

Problem

Notes

 

High Temperature Alarm

When temperature returns to setpoint range,

 

 

alarm code "E1" will clear.

 

Cabinet temperature has exceeded set

 

E1

temperature by 14.4°F (10°C) for more than

The value of x can be changed under F3 on the

 

x hours. The default value of x is "2" (2 hours).

Settings and Diagnostics Menu.

 

 

(0=No delay; 1=1 hour; 2=2 hours; 3=3 hours)

 

 

 

 

Low Temperature Alarm

When temperature returns to setpoint range,

 

 

alarm code "E2" will clear.

 

Cabinet temperature has remained below

 

E2

setpoint by 9°F (5°C) for more than y hours.

The value of y can be changed under F4 on the

 

The default value of y is "1" (1 hour).

Settings and Diagnostics Menu.

 

 

(0=No delay; 1=hour)

 

 

 

 

Defrost Alarm

E3 may alternate with "dF" instead of the

E3

 

temperature.

Defrost has taken longer than 1 hour. Control

 

 

 

 

board has terminated defrost.

 

 

 

 

 

High Pressure Alarm

Clean filter if necessary. Allow time for

 

 

pressure switch to react, then turn power off

 

Compressor discharge pressure is outside

and back on again to reset.

E4

normal operating range. Pressure switch has

 

 

been triggered 5 or more times in 1 hour.

If switch trips 5 times in 1 hour, and the

 

Condenser filter may need cleaning.

above steps do not clear alarm code, see the

 

 

procedure contained in this section.

 

Clogged Filter Alarm

Clean filter. Allow time for sensor to react, then

 

 

turn power off and back on again to reset.

E7

Condenser temperature is outside of normal

 

 

operating range. Condenser filter needs

 

 

cleaning.

 

 

Defrost Temperature Sensor Malfunction Alarm

After replacing sensor, alarm will reset.

E8

 

 

 

Defrost temperature sensor has failed.

 

 

Clogged Filter Sensor Malfunction Alarm

After replacing sensor, alarm will reset.

E9

 

 

 

Clogged filter sensor has failed.

 

 

EEPROM Write Error Alarm

After replacing the control board, alarm will

EA

 

reset.

 

Control board is defective.

 

 

EEPROM Verification or Read Error Alarm

After replacing the control board, alarm will

ED

 

reset.

 

Control board is defective.

 

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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 2a. HWR40A-D, HWF40A-D HWR40A, HWF40A3a. HUR68A-D, HUF68A-D HUR68A, HUF68A4a. HWR68A-D, HWF68A-D HWR68A, HWF68AHUR96A Units mm 5a. HUR96A-D HWR96A Units mm 6a. HWR96A-D Evaporator Case II. General Information ConstructionSequence of Operation and Timing Charts Refrigerators Continuous Operating ModeSequence of Operation Operating Timing ChartFreezers Continuous Operating Mode Freezers Continuous Defrost End Defrost thermistor reaches defrost Refrigerators Energy Saving Operating ModeEnergy Board Self Check Minute Delay Freezers Energy Saving Operating ModeFreezers Energy Control Board Start-Up DelayThermistor Wiring Harness K151 Relay Wiring Harness K311Rear FrontGaining Access to Settings and Diagnostics Settings and DiagnosticsTemperature Display Switching the Display Between Fahrenheit and Celsius F5Adjusting the Setpoint Temperature Cabinet Temperature Correction calibration factor Later Section Settings and Diagnostics MenuDefrost Interval F0 Defrost Termination Temperature F1Setpoint Temperature Differential F2 Low Temperature Alarm Delay Time F4 High Temperature Alarm Delay Time F3Alarm History F6 Temperature Display Scale F5Operating Modes Compressor Run Time F7Perimeter Frame Heater ContinuousEnergy Saving Alarm Signals Alarm Code Problem III. Service Diagnosis Alarm CodesError Code Priority Description Alarm Display PriorityHigh Temperature Alarm E1 Alarm Details and CountermeasuresReset Options Possible CausesLow Temperature Alarm E2 High Pressure Alarm E4 Defrost Alarm E3Clogged Filter Alarm E7 Defrost Temperature Sensor Malfunction Alarm E8 Clogged Filter Sensor Malfunction Alarm E9 Control Board Error Alarms EA and ED Problem Possible Cause Remedy Diagnosis ChartProblem Possible Cause Remedy Problem Possible Cause Remedy Thermistor Check Service for Refrigerant Lines IV. Removal and Replacement of ComponentsRefrigerant Recovery BrazingEvacuation and Recharge Removal and Replacement of Compressor Removal and Replacement of Refrigeration UnitRemoval and Replacement of Evaporator Page Page Cabinet Thermistor Removal and Replacement of ThermistorsDefrost Thermistor Clogged Filter Thermistor sensorRemoval and Replacement of Defrost Heater Removal and Replacement of Door GasketRemoval and Replacement of Control Board Door Re-Hinging and Drawer Conversion Removal and Replacement of Fan MotorsCondenser Fan Motor Evaporator Fan MotorCleaning Cleaning and Maintenance InstructionsAir Filter MaintenanceShelves 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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