Fujitsu Airstage VR-II Series Service Manual page 96

Trouble shooting 3
INDOOR UNIT Error Method:
Number excess of device in Wired
remote contorller system (2 Wires RC)
Detective Actuators:
Wired remote controller ( 2-Wire )
Indoor unit Controller PCB circuit
Forecast of Cause : 1. Wrong wiring of RCgroup 2. Indoor unit controller PCB failure
Check Point 1 : Wire installation Wrong RCgroup setting
Wrong wire connection in RCgroup (Please refer to the installation manual)
The number of connecting indoor unit and Remote controller in one RCgroup were less than 32 units.
Check Point 2 : Check Indoor unit controller PCB
Check if controller PCB damage
Change controller PCB and check the Error after setting remote controller address
Indicate or Display:
E12.3
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 1 times Flash, Timer LED 2 Times Flash,
Error Code : 1 2
Detective details:
When the number of connecting Indoor unit and Remote controller in one
RCgroup exceeds more than 32 units.
04-12
Filter LED Continuous Flash.