Fujitsu ASUG12LZBS Service Manual page 50

2-3. E: 12.X. Wired remote controller communication error
(Indoor unit)
Indicator Indoor unit
Indoor unit
Detective actuator
Wired remote control
Forecast of cause
Check point 1. Check the connection of terminal
After turning off the power, check & correct the
followings.
• Check the connection of terminal between
remote controller and indoor unit, and check
if there is a disconnection of the cable.
Check point 2. Check connection
Check voltage at CN2 (terminal 1—3)
of UTY-TWRXZ2 (Communication Kit).
(Power supply to the remote controller)
Upon correcting the removed connec-
tor or mis-wiring, reset the power.
2-3. E: 12.X. Wired remote controller communication error (Indoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
Main PCB
↓
↓
End
Continuous flash
When the indoor unit cannot receive the signal from
Wired remote controller more than 1 minute during
normal operation.
Terminal connection abnormal
Wired remote control failure
Main PCB failure
• If it is DC 5 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
- (03-14) -
1 time flash
2 time flash
E: 12
2. Troubleshooting with error code