III. Service Diagnosis Alarm Codes | Hoshizaki HUR40A(-D) specs

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.
E3	Defrost has taken longer than 1 hour. Control
	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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Hoshizaki HUR40A(-D), HWR40A(-D), HUR96A(-D) III. Service Diagnosis Alarm Codes, Alarm Signals Alarm Code Problem

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, HWF40A 3a. HUR68A-D, HUF68A-D HUR68A, HUF68A 4a. HWR68A-D, HWF68A-D HWR68A, HWF68A HUR96A Units mm 5a. HUR96A-D HWR96A Units mm 6a. HWR96A-D Evaporator Case II. General Information Construction Sequence of Operation and Timing Charts Refrigerators Continuous Operating ModeSequence of Operation Operating Timing Chart Freezers Continuous Operating Mode Freezers Continuous Defrost End Defrost thermistor reaches defrost Refrigerators Energy Saving Operating Mode Energy Board Self Check Minute Delay Freezers Energy Saving Operating Mode Freezers Energy Control Board Start-Up Delay Thermistor Wiring Harness K151 Relay Wiring Harness K311Rear Front Gaining Access to Settings and Diagnostics Settings and Diagnostics Temperature Display Switching the Display Between Fahrenheit and Celsius F5Adjusting the Setpoint Temperature Cabinet Temperature Correction calibration factor Later Section Settings and Diagnostics Menu Defrost Interval F0 Defrost Termination Temperature F1 Setpoint Temperature Differential F2 Low Temperature Alarm Delay Time F4 High Temperature Alarm Delay Time F3 Alarm History F6 Temperature Display Scale F5 Operating Modes Compressor Run Time F7 Perimeter Frame Heater ContinuousEnergy Saving Alarm Signals Alarm Code Problem III. Service Diagnosis Alarm Codes Error Code Priority Description Alarm Display Priority High Temperature Alarm E1 Alarm Details and CountermeasuresReset Options Possible Causes Low Temperature Alarm E2 High Pressure Alarm E4 Defrost Alarm E3 Clogged 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 Chart Problem Possible Cause Remedy Problem Possible Cause Remedy Thermistor Check Service for Refrigerant Lines IV. Removal and Replacement of ComponentsRefrigerant Recovery Brazing Evacuation and Recharge Removal and Replacement of Compressor Removal and Replacement of Refrigeration Unit Removal and Replacement of Evaporator Page Page Cabinet Thermistor Removal and Replacement of ThermistorsDefrost Thermistor Clogged Filter Thermistor sensor Removal and Replacement of Defrost Heater Removal and Replacement of Door Gasket Removal and Replacement of Control Board Door Re-Hinging and Drawer Conversion Removal and Replacement of Fan MotorsCondenser Fan Motor Evaporator Fan Motor Cleaning Cleaning and Maintenance Instructions Air Filter MaintenanceShelves Drawers 115/60/1 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