Haier H2SM-(9+12)HEK03/R2 Service Manual page 54

7.4.4 Communication fault between indoor and outdoor system
Indoor Display
Method of Malfunction
Detection
Malfunction Decision
Conditions
Supposed Causes
* Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may
be occurred.
H2SM-(9+12)HEK03/R2
E7
Communication is detected by checking the indoor board and outdoor board
The outdoor PCB broken leads to communication fault
The indoor PCB broken leads to communication fault
The outdoor PCB is broken
The indoor PCB is broken
Communication wiring disconnected
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Service Diagnosis
Domestic Air Conditioner