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Seivice diagnosis
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Domestic air conditioner
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11.4.10 The communication fault between indoor and outdoor
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NO
˄A˅
Yes
NO
Yes
No
YES
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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
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ŶThe outdoor PCB broken leads to communication fault
ŶThe indoor PCB broken leads to communication fault
Ŷ
Communication wiring disconnected
ŶThe indoor PCB is broken
ŶThe outdoor PCB is broken
ŶThe 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
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indoor diplay
Outdoor diplay