Service Diagnosis; Alarm Codes - Hoshizaki HUR40A(-D) Service Manual

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 Code Problem
High Temperature Alarm
Cabinet temperature has exceeded set
E1
temperature by 14.4°F (10°C) for more than
x hours. The default value of x is "2" (2 hours).
Low Temperature Alarm
Cabinet temperature has remained below
E2
setpoint by 9°F (5°C) for more than y hours.
The default value of y is "1" (1 hour).
Defrost Alarm
E3
Defrost has taken longer than 1 hour. Control
board has terminated defrost.
High Pressure Alarm
Compressor discharge pressure is outside
E4
normal operating range. Pressure switch has
been triggered 5 or more times in 1 hour.
Condenser filter may need cleaning.
Clogged Filter Alarm
E7
Condenser temperature is outside of normal
operating range. Condenser filter needs
cleaning.
Defrost Temperature Sensor Malfunction Alarm
E8
Defrost temperature sensor has failed.
Clogged Filter Sensor Malfunction Alarm
E9
Clogged filter sensor has failed.
EEPROM Write Error Alarm
EA
Control board is defective.
EEPROM Verification or Read Error Alarm
ED
Control board is defective.
Alarm Signals
Notes
When temperature returns to setpoint range,
alarm code "E1" will clear.
The value of x can be changed under F3 on the
Settings and Diagnostics Menu.
(0=No delay; 1=1 hour; 2=2 hours; 3=3 hours)
When temperature returns to setpoint range,
alarm code "E2" will clear.
The value of y can be changed under F4 on the
Settings and Diagnostics Menu.
(0=No delay; 1=hour)
E3 may alternate with "dF" instead of the
temperature.
Clean filter if necessary. Allow time for
pressure switch to react, then turn power off
and back on again to reset.
If switch trips 5 times in 1 hour, and the
above steps do not clear alarm code, see the
procedure contained in this section.
Clean filter. Allow time for sensor to react, then
turn power off and back on again to reset.
After replacing sensor, alarm will reset.
After replacing sensor, alarm will reset.
After replacing the control board, alarm will
reset.
After replacing the control board, alarm will
reset.
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