Midea M2OC-18HFN1-M Service Manual page 56

9.4.1.11 Mode conflict.
Error Code
Malfunction decision
conditions
Unit action
Cooling mode
Heating Mode
Fan
Off
No: No mode conflict;
Yes: Mode conflict
P5
The indoor units cannot work cooling mode and heating at same time.
Heating mode has a priority.
● Suppose Indoor unit A working in cooling mode or fan mode, and
indoor unit B is set to heating mode, then A will change to off and B
will work in heating mode.
● Suppose Indoor unit A working in heating mode, and indoor unit B
is set to cooling mode or fan mode, then B will change to stand by
and A will be no change.
Cooling mode Heating Mode
No
Yes
No
No
Fan
Yes No
No Yes
Yes No
No No
Off
No
No
No
No