Perfect Aire 3PAMS18-HH-MZO2, Service Manual

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7.4.1.10 Indoor units mode conflict
Error Code P5(old model) or - -(new model)
Malfunction conditions The indoor units cannot work cooling mode and heating at same time.
Heating mode has a priority.
Potential causes
●
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 Fan Off
Cooling mode No Yes No No
Heating Mode Yes No Yes No
Fan No Yes No No
Off No No No No
No: No mode conflict;
Yes: Mode conflict