Fujitsu AOU30RLXEH Design & Technical Manual page 41

 Indoor unit fan operation status
Function
Mode External input and
setting /
10 60-10 / C
0-1 60-00 / 1
Output signal
On
The indoor unit fan is operating.
Low → High
Off The fan is stopped or during cold air prevention.
High → Low During thermostat off when in dry mode operation.
Indoor unit
CN3
CN311―312
Rotary SW on
output PCB
Output of indoor unit
External input and
Fan run
Fan stop
High
Low
On
Off
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External output
CN3
CN312
output PCB
Condition
Output
Command
signal
Low → High Fan run
High → Low Fan stop
Off → On Fan run
On → Off Fan stop