In case of multi-indoor systems, the indoor units cannot operate in incompatible operation modes (e.g. cooling and heating). When changing operation modes, the priority will be given to the priority unit (ref. the indoor unit manual for more information). The non-priority units will be put in standby mode in case the operation mode is not compatible with the selected operation mode on the priority indoor unit.
To solve the mode conflict, the operation modes of the priority and non-priority unit should be the same or compatible or the unit(s) should be turned OFF.
On the application, this will be visible as on below screenshots: