Fujitsu AUXB04GALH Service Manual page 55

Method 3. (Management by indoor unit)
Operation mode management is made "Management by indoor unit" by outdoor unit PUSH-SW
(field setting).
Then the master indoor unit is set by wired remote controller.
Thereupon the priority mode shifts to Cooling Priority or Heating Priority in accordance with input
from the master indoor unit regardless of the current priority mode.
The priority mode is fixed at either cooling or heating even if the master indoor unit stops
Cooling/heating switching can be performed by the master indoor unit only.
Cooling priority
(4) Opposite operation mode
When the operation mode commanded from an indoor unit (remote controller) and the operation mode
allowed by the system (cooling and dry operation for cooling only type and operation mode allowed by
priority mode for heat pump type) do not match, it is indicated by blinking of an LED.
Timer lamp: 3 secs ON/1 sec OFF repeated
Heating priority
03-03