11.2 Indoor unit fault analysis
Faults E1, E2, E3, E6, F4 and FA: Probe fault
Check the connection of the respective probe to
the circuit board. Are these correctly imple-
mented?
NO
Establish a proper connection.
YES
Replace the respective control board.
Fault F3: Overcurrent protection on the compressor
Check all electrical connections. Are these cor-
rectly implemented?
NO
Replace the connections.
YES
Check the compressor windings. Are they OK?
NO
Replace the compressor.
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 cor-
rect?
NO
Check the unit for leaks and fill with new refrig-
erant.
YES
Refrigerant cannot circulate. Possibly due to
internal contamination or kinked lines.
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