Fujitsu ACUH09LUAS1 - E: 11. Serial Communication Error (Serial Forward Transfer Error) (Indoor Unit)

2-2. E: 11. Serial communication error (Serial forward transfer
error) (Indoor unit)
Indicator
→ired remote
controller
Error code E: 11
Detective actuator
Indoor unit
Main PCB
→hen the outdoor unit cannot properly receive the serial
signal from indoor unit for 10 seconds or more.
Fan motor
Outdoor unit Main PCB
Forecast of cause
Connection failure
External cause
Main PCB failure
Check point 1. Reset the power and operate
Does error indication show again?
 If no, go to "Check point 1-2".

Check point 2. Check connection
Check any loose or removed connection line of indoor unit and outdoor unit.
 If there is an abnormal condition, correct it by referring to the installation manual or the “DESIGN
& TECHNICAL MANUAL”.
Check connection condition is control unit. (If there is loose connector, open cable or mis-wiring.)

Check point 3. Check the voltage of power supply
Check the voltage of power supply
Check if AC 198 V (AC 220 V -10%) to AC 264 V (AC 240 V +10%) appears at
outdoor unit terminal L — N.
+
-

2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit) - (03-5) - 2. Troubleshooting with error code
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