E: 12. Wired Remote Controller Communication Error (Indoor Unit) - Fujitsu AUXG18KVLA Service Manual

2-3. E: 12. Wired remote controller communication error (Indoor
unit)
Wired remote
Indicator
controller
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 wired remote controller and indoor unit, and check if
there is a disconnection of the cable.
Check Point 1-2 : Check Wired remote controller and main PCB
[AU type]
Check voltage at CN14 of main PCB (terminal 1—3, terminal 1—2). (Power supply to the remote
controller)
• 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
[AR type]
Check voltage at CN300 of main PCB (terminal 1—3, terminal 1—2). (Power supply to the remote
controller)
• If it is DC 13 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

2-3. E: 12. Wired remote controller communication error (Indoor unit)

Error code
Main PCB
↓
↓
End
When 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
Terminal connection abnormal
Wired remote control failure
Main PCB failure
- (03-9) -
E: 12
2. Troubleshooting with error code