ALARM FUNCTIONS AND DISPLAYS
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POSSIBLE CAUSE 1: OUTSIDE TEMPERATURE LOWER
THAN -20 °C.
POSSIBLE CAUSE 2: EXCESSIVE TEMPERATURE
DIFFERENTIAL BETWEEN EVAPORATION AND
CONDENSING. THE COMPRESSOR PERMITS THE
ADDITIONAL HEATER TO SUPPLY THE CORRECT
TEMPERATURE IF IT CANNOT DO SO ON ITS OWN.
POSSIBLE CAUSE 3: LOW REFRIGERANT LEVEL.