Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 168

[ VII Control ]
-16- Operation Mode <PQHY>
(1) Indoor unit operation mode
The operation mode can be selected from the following 5 modes using the remote controller.
1 Cooling mode
2 Heating mode
3 Dry mode
4 Fan mode
5 Stopped mode
(2) Heat source unit operation mode
1 Cooling mode
2 Heating mode
3 Stopped mode
When the heat source unit is performing a cooling operation, the operation mode of the connected indoor units that are not in
the cooling mode (Stopped, Fan, Thermo-OFF) cannot be changed to heating from the remote controller. If this attempt is
mode, "Heating" will flash on the remote controller. The opposite is true when the heat source unit is performing a heating
operation. (The first selection has the priority.)
HWE15150
All indoor units in operation are in cooling mode.
All indoor units in operation are in heating mode.
All indoor units are in fan mode or stopping mode.
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