YES
YES
YES
Check supply power voltage.
NO
NO
NO
NO
YES
YES
NO
NO
YES
Is the voltage supply OK?
Are the service valves open?
Is the high pressure during
operation OK?
Are the checks of the insulation
resistance and the coil’s resistance
(0.4 ohm or greater at 25 °C) for
the compressor OK?
Is the power transistor check OK?
- Is the air circulation at the outdoor
unit obstructed?
- Is the installation space sufficient?
- During cooling, does the fan motor
run?
- Are the service valves fully open?
- Is the filter blocked?
- Are the low pressure sensor
and the suction gas sensor OK?
- Does the compressor sound
different than usual?
Does the fault disappear if the
current is switched off and on
several times?
Temporary surge on incoming
supply may have caused the alarm.
Open the service valves.
Check the amount of refrigerant.
Check the refrigerant circuit.
Replace the compressor.
Replace the inverter PCB.
Replace the inverter PCB.
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