Haier N-Series Service Manual page 44

10.3.9 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
■ The outdoor PCB broken leads to communication fault
Malfunction
■ The indoor PCB broken leads to communication fault
Decision
Conditions
■ Communication wiring disconnected
Supposed
■ The indoor PCB is broken
Causes
■ The outdoor PCB is broken
■ The Module PCB is broken
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
else parts damage may be occurred.
LED 1 LED 2
OFF ON
ON ON
OFF OFF
42
Yes
Solution
Outdoor PCB fault
This is caused by Outdoor PCB or Indoor PCB
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