High Pressure Alarm (HH)
Each time the pressure switch trips, the buzzer and red LED are activated. If more than ten trips occur during a
1-hour period then the unit will shut down automatically. The remote relay will be activated and the label ERR will
flash on the display alternating with the room temperature. The alarm code EO is displayed in the Alarm Menu.
The cause can be:
• Dirty condenser
• Condenser fan not running
• Front cover not fitted
• Obstructed condenser air inlet
• Obstructed condenser air outlet
• Inadequate ventilation
TROUBLE SHOOTING
1) Compressor stops. There is an internal over temperature device (Klixon) that stops the compressor each time the
admissible temperature of the motor windings is exceeded.
Possible causes are:
• Insufficient ventilation to the compressor
• Mains voltage anomaly
• Faulty condenser fan
The device will re-set automatically when the windings cool down.
2) Formation of ice on evaporator coil impeding airflow.
Possible causes are:
• Excessive door openings
• Door left open for long periods
• Evaporator fan/s faulty
• Door switch faulty (if fitted)
• Faulty defrost heater (if fitted)
• Faulty hot gas solenoid valve (if fitted)
• Pre set defrost routine not sufficient to clear evaporator of ice build up.
• Decrease the time interval between defrosts.
3) Display does not illuminate.
• Is their power to the unit?
• Is the mains cable connected correctly?
• Have the fuses in the electrical panel blown?
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