Fujitsu AUUH18LUAS Service Manual page 73

2-2. E: 11.X. Serial communication error (Serial forward transfer
error) (Indoor unit)
→ired remote
Indicator
controller
Detective actuator Indoor 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 187 V (AC 208 V -10%) to AC 253 V (AC 230 V +10%) appears at
outdoor unit terminal L1—L2.
2-2. E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit)
Error code
→hen the outdoor unit cannot receive the serial signal
Main PCB
from indoor unit more than 10 seconds.
1-2".
- (03-7) -
E: 11
Connection failure
External cause
Main PCB failure
+
-
2. Troubleshooting with error code