Service diagnosis
39 Domestic air conditioner
10.3.10 The communication fault between indoor and outdoor
Indoor display
ƵƵƾ E7
outdoor display
LED1 flash 15 times
Method of
Communication is detected by checking the indoor PCB and the outdoor PCB.
Malfunction
Detection
Malfunction Ŷ
The outdoor PCB broken leads to communication fault.
Decision Ŷ
The indoor PCB broken leads to communication fault.
Conditions
Supposed Ŷ Communication wiring disconnected.
Causes Ŷ
The indoor PCB is broken.
Ŷ
The outdoor PCB is broken.
Ŷ
The Module PCB is broken.
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
Restart the a/c and it
becomes normally.
If starting up normally, but
malfunction occurs again after a while
The outdoor
mainboard needs
dehumidification.
The outdoor
mainboard needs
dedust.
Check whether the linking
cable between the indoor and outdoor
is well connected or whether its core
wires are well insulated or its
L/N
is not reversed.
Reconnect the linking
cable or replace the
linking cable with new
one.
NO
YES
YES
NO
YES
Check the indoor mainboard˖only indoor
charged.
Measure the voltage between 3 and 4 of IC6
on the indoor mainboard with a multimete .And
measure the voltage between CN23(C) and
CN21(L) with a multimeter .
NO
YES
(A)
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