E: 11. Serial Communication Error (Serial Forward Transfer Error) (Indoor Unit) - Fujitsu ASYG09KHCA Service Manual

2-2. E: 11. Serial communication error (Serial forward transfer
error) (Indoor unit)
Indicator Indoor unit
Indoor unit
Detective actuator
Outdoor unit
Forecast of cause
Check point 1. Reset the power and operate
Does error indication show again?
→ If no, go to "Check point
Check point 2. Check connection
Check any loose or removed connection line of indoor unit and outdoor unit.
Check connection condition is control unit. (If there is loose connector, open cable or mis-wiring.)
→ If there is an abnormal condition, correct it by referring to the installation manual or the "DESIGN
& TECHNICAL MANUAL".
Check point 3. Check the voltage of power supply
Check the voltage of power supply
Check if AC 270 V (AC 230 V -10%) to AC 253 V (AC 230 V +10%) appears at
outdoor unit terminal L — N.

2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit)

Operation indicator
Timer indicator
Economy indicator
Error code
Main PCB
When the outdoor unit cannot receive the serial signal
Fan motor
from indoor unit more than 10 seconds.
Main PCB
1-2".
↓
↓
↓
- (03-4) -
1 time flash
1 time flash
Continuous flash
E: 11
Connection failure
External cause
Main PCB failure
Indoor unit fan motor failure
Outdoor unit Main PCB
2. Troubleshooting with error code
+
-