Fujitsu AUXB04GALH Service Manual page 80

Trouble shooting 2
INDOOR UNIT Error Method:
Wired Remote Controller signal Error
Detective Actuators:
Indoor unit Controller PCB circuit
Wired Remote Control (3 wire type)
Forecast of Cause :
1. Terminal connection abnormal
Check Point 1 : Check the connection of terminal
After turning off the power, 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.
OK
Check Point 2 : Check Remote and 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
lIf DC0V, Controller PCB failure (Remote is OK)
In case of re-installation is done due to removed connector or incorrect wiring,
turn on the power again.
Indicate or Display:
E12.2
Outdoor Unit : E.5 U.1,
Indoor Unit : Operation LED 1 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.
Remote Controller : 1 2
Detective details:
More than 1 time of Token (Communication between wired remote controllers)
is received, but it was not received more than 1 minute.
2. Mis-setting 3. Wired Remote Control failure
>>> Replace Conroller PCB
04-10
4. Controller PCB failure
DC