Trouble shooting 28
INDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause:
OK
Indicate or Display:Indicate or Display:
Refer to error code table.
YESYES
NO
Communication Error
(Main PCB <--- Display PCB)
Indoor Unit Main PCB Circuit
Display PCB
1. Connection failure 2. External cause 3. Display PCB failure 4. Main PCB failure
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 connection between Main PCB and
Display PCB.
(If there is loose connector or open cable)
Check Point 3 : Replace Display PCB
>> If Check Point 1, 2 do not improve the symptom, change Display PCB.
(If the symptom does not change, replace Main PCB.)
When the Main PCB cannot receive the signal from the Display PCB.
02-34
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