19
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
E1
High Temperature Alarm
Cabinet temperature has exceeded set
temperature by 18°F (10°C) for more than
x minutes. The default value of x is "2" (120
minutes).
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=0; 1=60; 2=120; 3=180 minutes)
E2
Low Temperature Alarm
Cabinet temperature has remained below
setpoint by 9°F (5°C) for more than y minutes.
The default value of y is "1" (60 minutes).
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=0; 1=60 minutes)
E3
Defrost Alarm
Defrost has taken longer than 1 hour. Control
board has terminated defrost.
E3 may alternate with "dF" instead of the
temperature.
E4
High Pressure Alarm
Compressor discharge pressure is outside
normal operating range. Pressure switch has
been triggered 5 or more times in 1 hour.
Condenser filter may need cleaning.
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.
E7
Clogged Filter Alarm
Condenser temperature is outside of normal
operating range. Condenser filter needs
cleaning.
Clean filter. Allow time for sensor to react, then
turn power off and back on again to reset.
E8
Defrost Thermistor Malfunction Alarm
Defrost thermistor has failed.
After replacing thermistor, alarm will reset.
E9
Clogged Filter Thermistor Malfunction Alarm
Clogged filter thermistor has failed.
After replacing thermistor, alarm will reset.
EA
EEPROM Write Error Alarm
Control board is defective.
After replacing the control board, alarm will
reset.
ED
EEPROM Verification or Read Error Alarm
Control board is defective.
After replacing the control board, alarm will
reset.
Summary of Contents for RF28A
Page 6: ...6 1 RR28A RF28A Units mm in ...
