Haier HSU-12RS03/R2(SDB) - Communication Error between the Indoor and Outdoor Units

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Domestic air conditioner
HSU-09/12RS03/R2(SDB) Service Diagnosis
7.4.8 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
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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 Ƶ indoor unit- outdoor unit signal transmission error due to wiring error
Causes Ƶ Faulty PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
or else parts damage may be occurred.
NO
˄A˅
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.
Yes
Yes
Yes
No
No
The outdoor mainboard needs
dehumidification.
The outdoor mainboard
needs dedust.
1. Reconnect the linking cable;
2. Replace the linking cable with
new one.