Fault F3: Overcurrent protection on the compressor
Check all electrical connections. Are these
correctly implemented?
NO
Replace the connections.
YES
Check the compressor windings. Are they
OK?
NO
Replace the compressor.
YES
Exchange the control boards of the outdoor
unit
Fault F4: Compressor outlet probe fault
Check the connection of the respective probe
to the circuit board. Are these correctly imple-
mented?
NO
Establish a proper connection.
YES
Check the resistance of the probe. Is the
measured value plausible? 50 k
W
at 25 °C.
NO
Replace the probe.
YES
Replace the respective control board.
Fault F5: Compressor overtemperature has tripped
Check the indoor unit and outdoor unit heat
exchangers for cleanliness. Is the air
exchange guaranteed?
NO
Clean the respective heat exchanger.
YES
Switch the unit off for 10 minutes. Check
whether the unit starts up again normally.
NO
Check all electrical connections and the heat
gas probe.
YES
Check the fill level of the refrigerant. Is this
correct?
NO
Check the unit for leaks and fill with new
refrigerant.
YES
Refrigerant cannot circulate. Possibly due to
internal contamination or kinked lines.
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