Haier HSU09VHJ Service Manual page 61

7. .8 Communication error between the indoor and outdoor units
:
The date received from the another unit in indoor unit-outdoor unit signal transmission is
checked whether is normal
Detection
Malfunction When the date sent from the another unit cannot be received normally,or when the content
Decision of the data is abnormal
Conditions
Supposed indoor unit- outdoor unit signal transmission error due to wiring error
Faulty PCB
Causes
or else parts damage may be occurred.
Restart the a/c and it
becomes normally.
NO
If starting up normally, but
malfunction occurs again
after a while
No
Check whether the linking cable
between the indoor and outdoor
is well connected or whether its
core wires are well insulated.
Yes
A
HSU09VHJ DB -SM
LED1 flash 15 times
Be sure to turn off power switch before connect or disconnect connector,
Yes
Yes
No
59
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
Service Diagnosis