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CONTROLLER ALARMS AND FAULT FINDING
When a fault is detected, the red Led in key (4) will be lit and a fault code displayed on the screen (5). This code enables
a speedy identification of the problem and should be reported when making the service call. (The audible alarm will also
sound if fitted)
HIGH TEMPERATURE ALARM
The label (HI) and the room temperature are intermittently
displayed one after the other.
Alarm relay activated -
Causes: • The door has been opened to frequently.
• The product load in the room exceeds room
capacity.
• The temperature of the products stored in
the room is too high.
• Refrigeration system malfunction.
ROOM TEMPERATURE SENSOR ALARM
The label (EO) appears on the digital display.
Alarm relay activated -
Causes: • The sensor is not connected/faulty.
Solution: • Replace sensor.
LOW TEMPERATURE ALARM
The label (LO) and the room temperature are intermittently
displayed one after the other.
Alarm relay activated -
Causes: • Electronic control unit malfunction.
Solution: • Call technical assistance service.
EVAPORATOR SENSOR ALARM
The label (E1) and the room temperature are intermittently
displayed one after the other.
Alarm relay activated -
Causes: • The sensor is not connected/faulty.
Solution: • Replace sensor.
HIGH PRESSURE ALARM (SP-5H, SP- 4L, SP-L5 only)
The label (HH) and the room temperature are intermittently displayed one after the other; led (4) lights up each time the
high pressure switch is tripped. If the high pressure switch is tripped more than 10 times in a one-hour period, the label
(PP) and the room temperature are intermittently displayed one after the other on display (5), while the alarm relay will
be activated with led (4).
Causes: • Ensure that the condenser fan is working properly.
• Ensure that the condenser is clean.
EVAPORATOR FANS NOT WORKING
• If the evaporator fans are not working and the green LED is illinated check connections on the main control
board.
• If a door switch is fitted check connections and operation.
COMPRESSOR NOT WORKING
• If compressor LED is illuminated check output on the main control board.
• Check power going to compressor wiring.
EVAPORATOR ICED UP
• Enquire as to when last manual defrost was initiated.
• Check defrost cycle by initiating manual defrost via front facia operation (see Controller Operation).
• Check output on main control board.
• Check that the hot gas solenoid valve is operating.
• Check termination time and temperature settings in Controller Parameters.
• Check coldroom door seal.
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