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10.3.10 The communication fault between indoor and outdoor
Indoor display
E7
Outdoor display
LED1 flash 15 times
Method of
Communication is detected by checking the indoor PCB and the outdoor PCB
Malfunction
Detection
Malfunction
The outdoor PCB broken leads to communication fault
Decision
The indoor PCB broken leads to communication fault
Conditions
Supposed
Causes
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector,
1.Check whether the connect cable is bad connection.
2. Check whether the LN wire reversal connection
3.Check whether the communication wire connection is tight
NO
Check the outdoor PCB
LED
LED
ON/OFF
ON/OFF
ON/OFF
Communication wiring disconnected
The indoor PCB is broken
The outdoor PCB is broken
The Module PCB is broken
else parts damage may be occurred.
LED 1
LED 2
OFF
ON
ON
ON
OFF
OFF
43
Yes
Solution
Outdoor PCB fault
This is caused by Outdoor PCB or Indoor PCB
No
fault. Change one part firstly, if still unsolved,
change another one
This is caused by Outdoor PCB or Power module
fault. Change one part firstly, if still unsolved,
change another one
Seivice diagnosis
Fix the connect cable
Domestic air conditioner
or
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