Fujitsu AOU12RL2 2-2TROUBLE SHOOTING WITH ERROR CODE, Detective Actuators, Detective details

2-2 TROUBLE SHOOTING WITH ERROR CODE

Trouble shooting 1-1 OUTDOOR UNIT Error Method:

Serial communication error (Serial Reverse Transfer Error)

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB

Detective details:

When the indoor unit cannot receive the serial signal from Outdoor unit more than 2minutes after power ON, or the indoor unit cannot receive the serial signal more than 15seconds during normal operation.

Forecast of Cause:
1. Connection failure	2. External cause	3. Main PCB failure

Check Point 1-1 : Reset the power and operate

Does Error indication show again?

YES

NO

Check Point 2 : Check Connection	Check Point 1-2: Check external cause such as noise
Check any loose or removed connection line of	Check the complete insulation of the grounding.
Indoor unit and Outdoor unit.	Check if there is any equipment that causes harmonic wave
>> If there is an abnormal condition, correct it by	near the power cable (Neon light bulb or any electronic
referring to Installation Manual or Data &	equipment which causes harmonic wave).
Technical Manual.

OK

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC103V (AC115V -10%) - 127V (AC115V +10%) appears

at Outdoor Unit Terminal L - N.

OK

Check Point 4 : Check Serial Signal (Reverse Transfer Signal)

Check Serial Signal (Reverse Transfer Signal)

>>Check if Indicated value swings between AC45V and AC135V at Outdoor Unit Terminal 1 - 3.

>>If it is abnormal, replace Main PCB.

GREEN

WHITE

BLACK

RED

WHITE

BLACK

N

L

3

2

1

+

-

02-02