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2-2 TROUBLE SHOOTING WITH ERROR CODE
Trouble shooting 1
OUTDOOR UNIT Error Method:
Serial communication error
(Serial reverse transfer error)
Detective Actuators:
Outdoor unit Main PCB
Outdoor unit fan motor
Forecast of Cause:
1. Connection failure
Check Point 1-1 : Reset the power and operate
Does error indication reappear?
YES
YES
Check Point 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 mis-wiring)
OK
Check Point 3 : Check the voltage of power supply
Check the voltage of power supply
>> Check if AC198(AC220V-10%) - 264V(AC240V+10%) appears
at outdoor unit terminal 1 - 2, L1 - N, L2 - N, L3 - N.
OK
Check Point 4 : Check serial signal (Reverse transfer signal)
Check serial signal (Reverse transfer signal)
>> Check if indicated value swings between AC70V and AC130V at outdoor unit terminal 2 - 3.
>> If it is abnormal, Check the parts as follows.
- Outdoor unit fan motor (PARTS INFORMATION 5)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If the parts are normal, replace Main PCB.
BLACK
1
WHITE
2
RED
3
Indicate or Display:
Refer to error code table.
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.
2. External cause
3. Main PCB failure 4. Outdoor unit fan motor failure
NO
+
-
Check Point 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).
02-03
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Troubleshooting
