iCOOL Alarm Codes

Fault active

Check failure list (F)

Alarm Active

Press ENT to check the alarm list (A)

No permission to run

• Activated HP / LP safety pressure switch
• No control voltage on HP / LP pressure switch
• No 24VDC control voltage on STOA and STOB inverter terminals

Inverter power supply alarm

Inadequate supply voltage or lack of one of the supply phases

Incorrect behavior of the temperature sensor

Unconnected or defective temperature sensor

Too low signal from the pressure sensor

• Pressure sensor not connected
• No voltage supply to the pressure sensor
• Damaged pressure sensor

USEr 1 – The compressor Cp1 is not ready for operation

• The supply of crankcase heater of compressor Cp1 is missing
• Active thermal protection of Cp1 compressor housing

USEr 2 – The compressor Cp2 is not ready for operation

• the supply of crankcase heater of the compressor Cp2 is missing
• No or incorrect supply of Cp2 compressor
• Wrong phase sequence connection or lack of one of the phases
• Activation of the HP/LP safety pressure switch

Inverter overload (60 second current)

• Operation of the compressor outside the envelope (too high condensing pressure)
• Too high condensing temperature, too low air flow through the condenser
• Pouring the compressor with a liquid refrigerant
• Damaged compressor

Momentary overload of the inverter (60 second current)

• Operation of the compressor outside the envelope (too high condensing pressure)
• Too high condensing temperature, too low air flow through the condenser
• Pouring the compressor with a liquid refrigerant
• Damaged compressor

Too high temperature of inverter heatsink

• Improper ventilation of the inverter chamber
• Faulty fan on the unit chassis – Faulty inverter fan
• Incorrect location of the unit

Too low temperature of inverter heatsink

• Faulty fan on the unit chassis
• Crankcase heater improper operation
• Too short waiting time before powering up the unit after power back up (low heat compressor)

Too high ambient temperature of the inverter

• Improper ventilation of the inverter chamber
• Faulty fan on the unit chassis
• Incorrect location of the unit

Too low ambient temperature of the inverter

• Faulty fan on the unit chassis
• Crankcase heater improper operation
• Too short waiting time before powering up the unit after power back up (low heat compressor)

Too high the temperature of the inverter capacitors

• Improper ventilation of the inverter chamber
• Faulty fan on the unit chassis
• Faulty inverter fan
• Incorrect location of the unit

The temperature at the discharge too high or defective temperature sensor

• Too high temperature compressor discharge by working outside the envelope
• Incorrect discharge temperature sensor
• Defective discharge temperature sensor

Compressor motor current protection

• Operation of the compressor outside the envelope (too high condensing pressure)
• Too high condensing temperature, too low air flow through the condenser
• Damaged compressor
• Incorrect inverter settings

Inverter overload

• Operation of the compressor outside the envelope (too high condensing pressure)
• Too high condensing temperature, too low air flow through the condenser
• Damaged compressor
• Incorrect inverter settings

Too low power supply voltage

• Incorrect power supply voltage
• Lack of one phase power supply
• Damaged inverter rectifier bridge

Exceeding the maximum frequency / very high frequency spike

• The problem with starting the compressor, check the pressure and shut-off valves
• Too high suction / discharge pressure difference
• Damaged compressor

Incorrect signal on STOA and STOB inverter terminals

• Incorrect wiring at the STOA and STOB inverter inlet terminals
• Broken wire
• Activation of the safety pressure switch HP / LP

Ground fault

• Short circuit of the inverter output to ground
• Moisture inside the chamber
• Short circuit inside the compressor

No reading from the discharge temperature sensor

• The compressor temperature sensor Cp1 is not connected
• Cp1 compressor discharge pipe temperature sensor defective

Current on MF1 too high (suction pressure sensor)

• Too high pressure on suction side
• Damaged (short circuited) suction pressure sensor

Too high suction pressure

• Too much evaporator load
• Suction pressure sensor defective

Lack of oil (only for iCOOL 12 MHP)

• Insufficient oil level
• Oil sensor malfunction.

Unexpected compressor stop

• Too high discharge pressure
• Compressor damaged
• Too low voltage supply during compressor operation or lack of 1 phase