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Error code
Display of 5 indicator lights
Fault Code
Fault classification / Fault type
High pressure sensor failure
FL
/
Low pressure sensor failure
FJ
/
Protection against phase loss and phase reversal
Lb
/
reserved
Er
Reserved
Exhaust air temperature over low protection
H5
AI ECO light is always on，The timer light flashes 5 times
Low pressure switch fault
H6
AI ECO light is always on，The timer light flashes 6 times
Protection against excessively low pressure
H7
AI ECO light is always on，The timer light flashes 7 times
Four-way valve failure
H8
AI ECO light is always on，The timer light flashes 8 times
Indoor coil inlet temperature sensor fault
H3
AI ECO light is always on，The timer light flashes 3 times
Indoor coil outlet temperature sensor fault
H4
AI ECO light is always on，The timer light flashes 4 times