Alarm Code Appears In Display - Hoshizaki HUR40A-D Instruction Manual

2. Alarm Code Appears in Display

If an error occurs, the alarm code and cabinet temperature are displayed in 1-second
intervals. When an error occurs, check the error code and follow the instructions below. If
more than one abnormal condition exists, alarm codes will be displayed in order of
priority.
Alarm Code Problem
High Temperature Alarm
Cabinet temperature has exceeded set
E1
temperature by 18°F (10°C) for more than x
minutes. The default value of x is "2" (120
minutes).
Low Temperature Alarm
Cabinet temperature has remained below
E2
setpoint by 9°F (5°C) for more than y minutes.
The default value of y is "1" (60 minutes).
Defrost Alarm
E3
Defrost has taken longer than 1 hour. Control
board has terminated defrost.
High Pressure Alarm
Compressor discharge pressure is outside
normal operating range. Pressure switch has
E4
been triggered 5 or more times in 1 hour.
Condenser filter may need cleaning.
Clogged Filter Alarm
Condenser temperature is outside of normal
E7
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.
If temperature is not back in range, and obvious
corrections do not bring temperature back in
range, call a qualified service technician.
When temperature returns to setpoint range,
alarm code "E2" will clear.
If temperature is not back in range, and obvious
corrections do not bring temperature back in
range, call a qualified service technician.
Call a qualified service technician.
Note that 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 the alarm code, call a
qualified service technician.
Clean filter. Allow time for sensor to react, then
turn power off and back on again to reset.
If this alarm occurs frequently, it is
recommended that a qualified service technician
be called.
Call a qualified service technician. After
replacing sensor, alarm will reset.
Call a qualified service technician. After
replacing sensor, alarm will reset.
Call a qualified service technician.
Call a qualified service technician.
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