Haier D Series Service Manual page 43

10.4.10 The communication fault between indoor and outdoor
Indoor display E7:Outdoor display
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
Detection
The indoor PCB broken leads to communication fault
Conditions
Supposed Communication wiring disconnected
The indoor PCB is broken
Causes
The outdoor PCB is broken
The Module PCB is broken
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooti
ng
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
LED1 flash 15 times
LED 1 LED 2
OFF ON
ON ON
OFF OFF
else parts damage may be occurred.
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
41
Service diagnosis
Fix the connect cable
Domestic air conditioner
or