Communication Error Between The Indoor And Outdoor Units - Haier HSU-18,22HVA103/R2(DB) Service Manual

7.2.8 Communication error between the indoor and outdoor units

Indoor display
Outdoor: display：
Method of The date received from the another unit in indoor unit-outdoor unit signal transmission is
Malfunction checked whether is normal
Detection
When the date sent from the another unit cannot be received normally,or when the content
Malfunction
of the data is abnormal
Decision
Conditions
Supposed ■ indoor unit- outdoor unit signal transmission error due to wiring error
Causes ■ Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
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
Check whether the linking cable
between the indoor and outdoor is
well connected or whether its
core wires are well insulated.
（A）
HSU-18,22HVA103/R2(DB)
E7 ；
LED1 flash 15 times
No
Yes
84
The outdoor
Yes
dehumidification.
The
Yes
needs dedust.
1. Reconnect the linking cable;
No
2. Replace the linking cable with
new one.
Service Diagnosis
or
mainboard needs
outdoor mainboard
Domestic Air Conditioner