Fujitsu AGHG12KVCB Service Manual page 44

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.
→ 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 207 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 properly receive the serial
Fan motor
signal from indoor unit for 10 seconds or more.
Main PCB
1-2".
↓
↓
↓
- (03-4) -
1 time flash
1 time flash
Continuous flash
E: 11
Connection failure
External cause
Main PCB failure
+
-
2. Troubleshooting with error code