Midea V8 VRF Series Service Manual page 52

6.1.10 A91 - Mode conflict (V6 communication protocol adopted)
Error display
Faulty IDU: The fan continues running, and the EXV is closed. Other IDUs of the same system:
Error impact
operate normally.
ODU of the same system: operate normally.


Error trigger

Error recovery
Automatic recovery

Possible cause

Troubleshooting
Note:
1. For all IDUs in the heat pump system: 1) When the ODU is running in heating mode, the IDU
can only operate in heating mode. If you would like to use the fan mode for the IDU, the wired
controller needs to be used to change the settings (for more instructions on how to change
settings, refer to "Instruction for Use of the wired controller"). 2) When the ODU is running in
cooling mode, the IDU can operate in cooling mode or fan mode.
Digital display
The ODU is running in heating mode, and the IDU is running in cooling mode or
dehumidification mode.
The ODU is running in heating mode, and the IDU is running in fan mode (note: the wired
controller can be used to set whether the heating mode conflicts with the fan mode).
The ODU is running in cooling mode, and the IDU is running in heating mode.
The operation mode of IDU conflicts with that of the ODU.
The IDU main control board is damaged.
A92
Reset IDU
After operating mode
(1), is the error
cleared?
Yes
Fault cleared
V8 VRF Indoor Units
Display position
Panel, display box, and wired controller
(Note: Error codes are displayed 2 minutes
after faults are triggered)
No
Replace the main control
board of the IDU
51