Are the characteristics of the hot
gas sensor ( Tho-D) OK?
YES
NO
YES
Are the hotgas temperature
checks normal?
Does the temperature (external
gauge) correspond with the
displayed temperature in the event
of an alarm?
- Is the filter blocked?
- Is the air circulation obstructed?
- Is the installation space
sufficient?
- Is the heat exchanger dirty?
Replace defective sensor.
Insufficient amount of refrigerant.
Action.
Does the fault also occur during
cooling?
Check the rotational speed of the
compressor.
Defective control board - replace.
NO
YES
NO
NO
YES
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