Are the characteristics of the
evaporator’s sensor (Tho-R1, R2)
OK?
YES
NO
YES
Are the high pressure checks
normal?
Does the temperature (external
gauge) correspond with the
displayed temperature in the event
of an alarm?
Too much refrigerant. Action.
Replace defective sensor.
- Is the air circulation at the outdoor unit
obstructed?
- Is the installation space sufficient?
- Is the evaporator soiled?
Is the outdoor unit operational in
the event of an alarm?
Check the rotational speed of the
compressor.
Defective control board - replace.
NO
YES
NO
NO
YES
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