Fujitsu AUXB04GALH Service Manual page 102

Trouble shooting 17
INDOOR UNIT Error Method:
Indoor unit Power Frequency
Abnormal
Detective Actuators:
Indoor Unit Controller PCB Circuit
Forecast of Cause :
1. Outside cause
4. Controller PCB defective
Check Point 1-1 : Reset Power Supply
Does abnormal LED indication show again?
YES
Check Point 2 : Check Installation condition
Check Cable/Breaker
Check loose or removed connection
>> If Installation defect is found, correct it by referring
to Installation Manual.
OK
Check Point 3 : Check connection of electric components
Check power supply voltage (AC198 - 264V between
Indoor unit terminal 1 and 2)
Check connection of Connector (any lose connector or
incorrect wiring)
Check any shortage or corrosion on PCB.
OK
Check Point 4 : Replace Controller PCB
Change Controller PCB and set up the original address.
Indicate or Display:
E31. 3
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 3 times Flash, Timer LED 1 Times Flash,
Error Code : 3 1
Detective details:
When 5 continuous failures occurred at Power frequency test.
2. Installation failure
NO
AC
04-26
Filter LED Continuous Flash.
3. Defective connection of electric components
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.
contact or leak current in the
power supply circuit.