54
Abnormal communication between the indoor unit main control board and fan drive
board
C41
Abnormal communication between the indoor unit and wired controller
C51
Abnormal communication between the indoor unit and Wi-Fi Kit
C52
Abnormal communication between the indoor unit main control board and
display board
C61
Abnormal communication between the AHU Kit slave unit and master unit
C71
Number of AHU Kits is not the same as the set number
C72
Abnormal communication between the linked humidifying indoor unit and
master indoor unit
C73
Abnormal communication between the linked FAPU and master indoor unit (series
setting)
C74
Abnormal communication between the linked FAPU and master indoor unit (non-series
setting)
C75
Abnormal communication between the main wired controller and secondary wired controller
C76
Abnormal communication between the indoor unit main control board and 1# Expansion board
C77
Abnormal communication between the indoor unit main control board and 2# Expansion board
C78
Abnormal communication between the indoor unit main control board and Switch
board
C79
Air inlet temperature of the indoor unit is too low in heating mode
d16
Air inlet temperature of the indoor unit is too high in cooling mode
d17
Alarm for exceeding temperature and humidity range
d81
Sensor control board fault
dE1
PM2.5 sensor fault
dE2
CO2 sensor fault
dE3
Formaldehyde sensor fault
dE4
Human Detect sensor fault
dE5
T0 (fresh inlet air temperature sensor) short-circuits or cuts off
E21
The upper dry bulb temperature sensor short-circuits or cuts off
E22
The lower dry bulb temperature sensor short-circuits or cuts off
E23
T1 (Indoor unit return air temperature sensor) short-circuits or cuts off
E24
Error
Error code Digital display
The built-in room temperature sensor of the wired controller short-circuits or cuts off
E31
The wireless temperature sensor short-circuits or cuts off
E32
The external room temperature sensor short-circuits or cuts off
E33
