18
Diagnostic 
display
Abnormality/Protection control
H 00 No memory of failure
H 11
Indoor/outdoor abnormal 
communication
H 12 Indoor unit capacity unmatched
H 14
Indoor intake air temperature sensor 
abnormality
H 15
Compressor temperature sensor 
abnormality
H 16
Outdoor current transformer (CT) 
abnormality
H 17
Outdoor suction temperature sensor 
abnormality
H 19 Indoor fan motor mechanism lock
H 21 Indoor fl oat switch abnormality
H 23
Indoor heat exchanger temperature 
sensor 1 abnormality
H 24
Indoor heat exchanger temperature 
sensor 2 abnormality
H 25
Indoor ion device abnormality
H 26 Ion generator breakdown abnormality
H 27
Outdoor air temperature sensor 
abnormality
H 28
Outdoor heat exchanger temperature 
sensor 1 abnormality
H 30
Outdoor discharge pipe temperature 
sensor abnormality
H 31 Indoor humidity sensor abnormality
H 32
Outdoor heat exchanger temperature 
sensor 2 abnormality
H 33
Indoor/outdoor misconnection 
abnormality
Diagnostic 
display
Abnormality/Protection control
H 34
Outdoor heat sink temperature sensor 
abnormality
H 35
Indoor drain water backfl ow 
abnormality
H 36
Outdoor gas pipe temperature sensor 
abnormality
H 37
Outdoor liquid pipe temperature 
sensor abnormality
H 38 Indoor/outdoor mismatch (brand code)
H 39
Abnormal indoor operating unit or 
standby units
H 41 Abnormal wiring or piping connection
H 50 Ventilation fan motor abnormality
H 51 Filter cleaning nozzle lock abnormality
H 52
Filter cleaning left-right limit switch 
abnormality
H 58 Indoor gas sensor abnormality
H 59 Eco sensor 
abnormality
H 64
Outdoor high pressure sensor abnormality
H 67 nanoe abnormality
H 70 Light sensor 
abnormality
H 71
DC cooling fan inside control board 
abnormality
H 72 PCB temperature sensor abnormality
H 85
Abnormal communication between 
indoor & wireless LAN module
H 97 Outdoor fan motor mechanism lock
H 98 Indoor high pressure protection
H 99 Indoor operating unit freeze protection
Troubleshooting
12:00,Mon
SET TEMP.
FAN SPEED
25
.0
FLAP
AUTO
AUTO
MODE
AUTO
H11
Indoor/outdoor abnormal 
communication
Error number
To retrieve an error code, go to 'System check' and press   
or 
 button until you hear beep sound. 
When the display shows an error code as indicated below, 
contact the number registered in the Remote Controller or a 
nearest authorised installer.
Below is a list of error codes that may appear on the display 
when there is some trouble with the system setting or 
operation.
 keys are disabled.
ACXF55-32681.indb   18ACXF55-32681.indb   18 1/20/2022   6:14:43 PM1/20/2022   6:14:43 PM