Fujitsu AUXB04GALH Service Manual page 106

Trouble shooting 20
INDOOR UNIT Error Method:
Indoor unit communication circuit (WRC)
microcomputers communication Error
Detective Actuators:
Wired remote controller ( 2-Wire )
Indoor unit Controller PCB circuit
Forecast of Cause : 1. Terminal connection abnormal
3. Indoor unit controller PCB defective
Check Point 1 : Check the connection of terminal
After turning off the power supply, check & correct the followings
Indoor unit - Check the connection of terminal between remote control and indoor unit,
or between Indoor units and check if there is a disconnection or short of the cable.
Check Point 2 , 3: Check Indoor unit controller PCB
Check terminal voltage of controller PCB connector CNC01 (Power supply for remote)
If DC12V, Remote control failure (Controller PCB is OK) >>> Replace Remote controller
If DC0V, Controller PCB failure (Remote is OK)
In case of re-installation is done due to remobed connector or incorrect wiring,
turn on the power again.
E3A. 1
Indicate or Display:
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 3 times Flash, Timer LED 10 Times Flash,
Error Code : 3 A
Detective details:
When the indoor unit(s) detects the configuration of RCG abnormal or
the indoor unit detects lack of primaly -remote controller.
>>> Replace Controller PCB
04-30
Filter LED Continuous Flash.
2. Wired remote controller failure