Seivice diagnosis
Domestic air conditioner
11.4.10 The communication fault between indoor and outdoor
NO
（A）
Yes
NO
Yes
No
YES
Restart the a/c and it
becomes normally.
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 mainboard needs
dehumidification.
The outdoor mainboard needs
dedust.
1. Reconnect the linking cable;
2. Replace the linking cable with new
one.
Method of
malfunction detection
Malfunction detection
conditions
Troubleshooting
Communication is detected by checking the indoor PCB and the outdoor PCB
■The outdoor PCB broken leads to communication fault
■The indoor PCB broken leads to communication fault
■
Communication wiring disconnected
■The indoor PCB is broken
■The outdoor PCB is broken
■The module PCB is broken
Supposed causes
* Caution
Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
E7
LED1 flash 15 times
indoor diplay
Outdoor diplay
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