Fujitsu ACUH09LUAS1, Service Manual

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2. Troubleshooting with error code
2-1. E: 11. Serial communication error (Serial reverse transfer
error) (Outdoor unit)
Indicator
→ired remote
controller
Error code E: 11
Detective actuator Outdoor unit
Main PCB →hen the indoor unit cannot receive the serial signal
from outdoor unit more than 2 minutes after power on,
or the indoor unit cannot receive the serial signal more
than 15 seconds during normal operation.
Fan motor
Forecast of cause Connection failure
External cause
Main PCB failure
Outdoor unit fan motor 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.
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 198 V (AC 220 V -10%) to AC 264 V (AC 240 V +10%) appears at
outdoor unit terminal L — N.
+
-
2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit)
- (03-3) -
2. Troubleshooting with error code
TR
O
U
B
LESH
O
O
TI
N
G
TR
O
U
B
LESH
O
O
TI
N
G