Midea MCH2U-18PHH2 Service Manual page 56

8.4.1.10 Indoor units mode conflict
Error Code
Malfunction conditions
Potential causes
Cooling mode
Heating Mode
Fan
Off
No: No mode conflict;
Yes: Mode conflict
P5(old model) or - -(new model)
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
56
Fan
Yes No
No Yes
Yes No
No No
Off
No
No
No
No