Haier N Series Service Manual page 60

. .10 The communication fault between indoor and outdoor
Indoor display
outdoor display
Method of
malfunction detection
Malfunction detection
conditions
Conditions
Supposed
Causes
Troubleshooting
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.
E7
LED1 flash 15 times
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.
* 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.
NO
YES
Yes
A
Yes
NO
No
Service diagnosis
The outdoor mainboard needs
dehumidification.
The outdoor mainboard needs
dedust.
1. Reconnect the linking cable;
2. Replace the linking cable with new
one.
Domestic air conditioner