Fujitsu AOTG30KMTC, Service Manual, Page: 52 / 199

2-2. E: 11. Serial communication error (Serial forward transfer
error) (Indoor unit)
Indicator
Indoor unit
Operation indicator 1 time flash
Timer indicator 1 time flash
Economy indicator Continuous flash
Error code E: 11
outdoor unit
Refer to “Error code table (Outdoor unit: for 34 model
only)” on page 1
Detective actuator
Indoor unit
Main PCB
When the outdoor unit cannot receive the serial signal
from indoor unit more than 10 seconds.
Fan motor
Outdoor unit Main PCB
Forecast of cause
Connection failure
External cause
Controller PCB failure
Indoor unit fan motor failure
Outdoor unit Main PCB
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.
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 216 to 264 V (AC 240 ±10%) appears at outdoor unit terminal L—N.
+
-
↓
2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit)
- (03-14) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING