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24.2.4 E04 - Communication Issue (Outdoor Unit)
Error Detection Method:
Faulty of indoor or outdoor unit PCB.
Signal transmission fail due to wrong wiring/improper connect
Signal transmission fail due to breaking of communication wire between indoor and outdoor unit.
Wrongly set the indoor unit address (duplicated)
Troubleshooting Method:
YES
YES
YES
NO
When abnormality indication starts again
Measure the AC voltage at terminal 1 & 2 of outdoor unit
terminal board
Is the measured voltage 220-230-240V? ● AC power supply abnormal fluctuation
NO
● Defect in communication circuitry
● Improper connection at terminals
Measure the DC voltage at terminal 2 & 3 (communication
terminals) of outdoor unit terminal board
Is the measured DC voltage fluctuate between 10~70V?
NO
● Improper connection at terminals
NO
Measure the AC voltage at terminal 1 & 2 of indoor unit
terminal board
Is the measured voltage 220-230-240V?
● Defect in receiver / transmitter module of
YES
Measure the DC voltage at terminal 2 & 3 of indoor unit
terminal board
Is the measured DC voltage fluctuate between 10~70V?
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
● Replace the PCB
of outdoor unit PCB
● Check indoor / outdoor connecting cable
indoor / outdoor
indoor / outdoor
● Check indoor / outdoor connecting cable
the communication circuitry in indoor
unit PCB
● Replace the indoor unit PCB
Caution
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