Fujitsu AUXB04GALH Service Manual page 94

Trouble shooting 16
INDOOR UNIT Error Method:
Indoor unit microcomputer
self-check error
Detective Actuators:
Indoor Unit Controller PCB Circuit
Forecast of Cause :
1. Outside cause 2. Defective connection of electric component
Check Point 1-1 : Reset Power Supply
Does abnormal LED indication show again?
YES
Check Point 2 :
Check Indoor Unit electric components
Check all connectors (loose connector or incorrect wiring)
Check any shortage or corrosion on PCB.
OK
Check Point 3 : Replace Controller PCB
Change Controller PCB and set up the original address.
Indicate or Display:
E32. 7
Outdoor Unit : E.5 U.1
Indoor Unit
Error Code
Detective details:
When the error is detected by the self-diagnosis of a microcomputer
: Operation LED 3 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.
: 3 2
3. Controller PCB defective
NO
Check Point 1-2 :
Check outside cause (Voltage drop or noise, etc.)
Instant drop --- Check if there is a large load electric apparatus
in the same circuit.
Momentary power failure ----- Check if there is a defective
Noise ----- Check if there is any equipment causing harmonic
wave near electric line (Neon bulb or electric
equipment that may cause harmonic wave).
Check the complete insulation of grounding.
04-24
contact or leak current in the
power supply circuit.