Midea V8 VRF Series Service Manual page 39

V8 VRF Indoor Units
5 Errors and operation code
5.1 Error Code Table
Table 5.1: Error code
Error
code
A01 Emergency stop
A11 R32 refrigerant leaks, requiring shutdown immediately
A51 ODU fault
The fault of the linked FAPU is transmitted to the
A71
master IDU (series setting)
The fault of the linked humidifying IDU is transmitted
A72
to the master IDU
The fault of the linked FAPU is transmitted to the
A73
master IDU (non-series setting)
The fault of the AHU Kit slave unit is sent to the master
A74
unit
A81 Self-check fault
A82 MS (refrigerant flow direction switching device) fault
A91 Mode conflict (V6 communication protocol adopted)
b11 1# EXV coil fault
b12 1# EXV body fault
b13 2# EXV coil fault
b14 2# EXV body fault
b34 Stall protection on 1# water pump
b35 Stall protection on 2# water pump
b36 Water level switch alarm
b71 Reheating electric heater fault
b72 Preprocessing electric heater fault
b81 Humidifier fault
C11 Duplicate IDU address code
C21 Abnormal communication between the IDU and ODU
Abnormal communication between the IDU main
C41
control board and fan drive board
Abnormal communication between the IDU and wired
C51
controller
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Error
code
C52 Abnormal communication between the IDU and Wi-Fi Kit
Abnormal communication between the IDU main control
C61
board and display board
Abnormal communication between the AHU Kit slave unit
C71
and master unit
C72 Number of AHU Kits is not the same as the set number
Abnormal communication between the linked humidifying
C73
IDU and master IDU
Abnormal communication between the linked FAPU and
C74
master IDU (series setting)
Abnormal communication between the linked FAPU and
C75
master IDU (non-series setting)
Abnormal communication between the main wired
C76
controller and secondary wired controller
Abnormal communication between the IDU main control
C77
board and 1# function expansion board
Abnormal communication between the IDU main control
C78
board and 2# function expansion board
Abnormal communication between the IDU main control
C79
board and adapter board
Air inlet temperature of the IDU is too low in heating
d16
mode
Air inlet temperature of the IDU is too high in cooling
d17
mode
d81 Alarm for exceeding temperature and humidity range
dE1 Sensor control board fault
dE2 PM2.5 sensor fault
dE3 CO2 sensor fault
dE4 Formaldehyde sensor fault
dE5 INTELLECTUAL EYE sensor fault
T0 (fresh inlet air temperature sensor) short-circuits or
E21
cuts off
The upper dry bulb temperature sensor short-circuits or
E22
cuts off
The lower dry bulb temperature sensor short-circuits or
E23
cuts off
T1 (IDU return air temperature sensor) short-circuits or
E24
cuts off
The built-in room temperature sensor of the wired
E31
controller short-circuits or cuts off
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