Fujitsu ACUH09LUAS1, Service Manual

Page: 55 / 153

2-3. E: 12. Wired remote controller communication error (Indoor
unit)
Indicator
→ired remote
controller
Error code E: 12
Detective actuator
Indoor unit Main PCB →hen the indoor unit cannot receive the signal from
wired remote controller more than following time during
normal operation.
• 3-wire type: 1 minute
• 2-wire type: 2.5 minutes
→ired remote control
Forecast of cause
Terminal connection abnormal
→ired remote control failure
Main PCB failure
Check point 1. Check the connection of terminal
After turning off the power, check & correct the followings.
• Check the connection of terminal between wired remote controller and indoor unit, and check if
there is a disconnection of the cable.
Check Point 1-2 : Check →ired remote controller
and main PCB
• If it is DC 12 V, remote controller is failure.
(Main PCB is normal)
– Replace remote control
• If it is DC 0 V, main PCB is failure. (Check
remote controller once again)
– Replace main PCB
Check voltage at CN14 (terminal 1—3,
terminal 1—2) of main PCB. (Power
supply to the remote controller)
Upon correcting the removed connec-
tor or mis-wiring, reset the power.
End
Check Point 2 : →ire installation wrong remote controller group setting
• →rong wire connection in remote controller group (Please refer to the installation manual)
• The number of connecting indoor unit and remote controller in one remote controller group
were less than 32 units.
Check Point 2-1 : Check Indoor unit main PCB
• Check if main PCB damage
• Change main PCB and check the error after setting remote controller address
End
2-3. E: 12. →ired remote controller communication error (Indoor unit)
- (03-7) -
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