Fujitsu AS*G09KXCA Series Service Instruction page 41

Trouble shooting 4
INDOOR UNIT Error Method:
Power Supply Frequency Detection Error
Detective Actuators:
Indoor unit Controller PCB
Indoor unit Power PCB
Forecast of Cause:
1. Connection failure
Test 1-1 : Reset the power supply and operate
Does error indication reappear?
YES
Test 2 : Check connection
Check any loose or removed connection line of
between indoor unit and outdoor unit.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.
Check connection condition in control unit.
(If there is loose connector, open cable or miss-wiring.)
OK
Test 3 : Check the voltage of power supply
Check the voltage of power supply
>> Check if AC207(AC230V-10%) - 253V(AC230V+10%) appears
at outdoor unit terminal L - N.
OK
Test 4 : Replace Controller PCB and Power PCB
If Test 1 - 3 do not improve the symptom, replace Controller PCB and Power PCB.
Indicate or Display:
Indoor unit:
Operation indicator: 3 time Flash
Timer indicator
Economy indicator: Continuous Flash
Error code: [ E: 31 ]
Detective details:
When power frequency is not detected by 15 seconds after power-on.
2. External cause 3. Controller PCB failure 4. Power PCB failure
NO
02-08
: 1 time Flash
Test 1-2 : Check external cause such as noise
Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).