HSU12HG(DB)-SM Service Diagnosis
59
Domestic Air Conditioner
7.3.8 Communication error between the indoor and outdoor units
Indoor display E7
Outdoor display LED1 flash 15 times.
Method of
The date received from the another unit in indoor unit-outdoor unit signal
transmission is
Malfunction
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
Causes
Faulty PCB
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
˄A˅
NO
YES
YES
NO
Yes
No
Restart the a/c and it
becomes normally.
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.
The outdoor mainboard needs
dehumidification.
The outdoor mainboard
needs dedusting.
1. Reconnect the linking cable;
2. Replace the linking cable with
new one.
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