Service Instruction

02-03
2-2 TROUBLE SHOOTING WITH ERROR CODE
Trouble shooting 1-1
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause:
OK
YESYES
NO
RED
WHITE
BLACK
BLACK
WHITE
GREEN
+
-
OK
Serial communication error
(Serial Reverse Transfer Error)
Outdoor unit Main PCB
Outdoor unit fan motor
Check Point 1-1 : Reset the power and operate
Does Error indication show again?
Check Point 1-2: Check external cause such as noise
Check the complete insulation of the grounding.
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).
Check Point 2 : Check Connection
Check any loose or removed connection line of
Indoor unit and Outdoor unit.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.
Check Point 3 : Check the voltage of power supply
Check the voltage of power supply
>> Check if AC187V (AC208V -10%) - 253V (AC230V +10%) appears
at Outdoor Unit Terminal L - N.
Check Point 4 : Check Serial Signal (Reverse Transfer Signal)
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.
N
L
3
2
1
Indicate or Display:
Refer to error code table.
Check serial signal (Reverse transfer signal)
>> Check if indicated value swings between AC90V and AC270V at outdoor unit terminal 1 - 3.
>> If it is abnormal, Check the parts as follows.
- Outdoor unit fan motor (PARTS INFORMATION 5)
- Active filter module (PARTS INFORMATION 6) *For AOU18RLFC
- Transistor PCB (IPM) (PARTS INFORMATION 7) *For AOU18RLFC
- Filter PCB (Check the wire of CN110) *For AOU18RLFC
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If Active filter module or IPM is abnormal, replace it.
>> If the parts are normal, replace Main PCB.
1. Connection failure 2. External cause 3. Main PCB failure 4. Active filter module failure
5. Transistor PCB (IPM) failure 6. Filter PCB failure 7. Outdoor unit Fan motor failure