Fujitsu Airstage V-II Service Manual page 72

Trouble shooting 2
INDOOR UNIT Error Method:
Power Frequency Abnormal
Detective Actuators:
Indoor Unit Controller PCB Circuit
Forecast of Cause : 1. Outside cause 2. Installation failure 3. Defective connection of electric components
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 (AC220V 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.
(Refer to 06-03 page Main PCB removal.)
Indicate or Display:
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 3 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.
Error Code : 3 1
Detective details:
When 5 continuous failures occurred at Power frequency test.
NO
Check Point 1-2 :
Check outside cause (Voltage drop or noise, etc.)
Instant drop ----- Check if there is a large load electric apparatus
Momentary power failure ----- Check if there is a defective
Noise ----- Check if there is any equipment causing harmonic
AC
04-11
in the same circuit.
contact or leak current in the
power supply circuit.
wave near electric line (Neon bulb or electric
equipment that may cause harmonic wave).
Check the complete insulation of grounding.