Haier N Series Service Manual page 47

10.4.10 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 The indoor PCB is broken.
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or else
Communication wiring disconnected.
The outdoor PCB is broken.
The Module PCB is broken.
parts damage may be occurred.
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Service diagnosis
Domestic air conditioner