Service diagnosis
7.4.9 Communication error between the indoor and outdoor units
Indoor display E4
Outdoor display: LED1 flash 15 time
Domestic air conditioner
Method of
malfunction
detection
Malfunction
detection
conditions
Supposed
causes
Troubleshooting
'
Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be caused
ƵIndoor unit- outdoor unit signal transmission error due to wiring error
ƵFaulty PCB
Check whether the signal which is transmitted between indoor and outdoor
unit is normal
When the communication-signal cannot be received normally, or when the
content of the signal abnormal.
YES
YES
NO
YES
NO
Restart the a/c and it
If starting up normally, but
malfunction occurs again
after a while
Check whether the linking cable
between the indoor and outdoor is
well connected or whether its core
wires are well insulated.
The outdoor PCB needs
dehumidification.
The outdoor PCB needs dedusting.
1. Reconnect the linking cable;
2. Replace the linking cable with
new one.
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