Mitsubishi Heavy Industries KXZ Series Service Manual page 35

③ When it is changed from same mode to unmatch.
Indoor unit 0 Stop Cooling Heating "Invalid operation" lamp flickers. Fan
Indoor unit 
④ Operation mode is prepared for change in the fan mode.
Indoor unit 0
Indoor unit 
<Last unit's operation mode>
① If the indoor unit  of which operation mode is different has joined in when the indoor units 0 is operating.
Indoor unit 0 Stop Cooling "Invalid operation" lamp flickers. Fan
Indoor unit 
<Priority of required major operation mode>
Outdoor operation mode
Indoor unit P0
(Cooling)
Indoor unit P0
OFF
(Heating)
Indoor unit P0
OFF
(Heating)
(v) Reset of unmatched condition (Cooling/heating unmatched)
When unmatch occurs among indoor units, it can be reset by either one of followings.
① If the operation mode of outdoor unit is matched with that of indoor unit.
② If the operation mode is changed to "Fan" or "Stop" on the indoor units on which Cooling/heating is unmatched.
ON
Stop Cooling
ON
Stop Fan
ON
Stop Heating
ON
ON
Stop Heating
ON
Cooling
ON
ON
Unmatched ⇒ Fan mode

– –
ON
Fan
Heating
Heating
Unmatched ⇒ Fan mode
Thermostat ON
ON
'14 • KX-SM-221
Cooling
Heating