The Communication Fault Between Indoor And Outdoor - Haier 1U12BE2ERA Service Manual

11.4.10 The communication fault between indoor and outdoor

indoor diplay
Outdoor diplay
Method of
malfunction detection
Malfunction detection
conditions
Supposed causes
Troubleshooting
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.
E7
LED1 flash 15 times
Communication is detected by checking the indoor PCB and the outdoor PCB
■The outdoor PCB broken leads to communication fault
■The indoor PCB broken leads to communication fault
■Communication wiring disconnected
■The indoor PCB is broken
■The outdoor PCB is broken
■The module PCB is broken
* Caution
Be sure to turn off power switch before connect or disconnect connector,
parts damage may be occurred.
NO
YES
YES
（A）
The outdoor mainboard needs
YES
dehumidification.
NO
1. Reconnect the linking cable;
NO
2. Replace the linking cable with new
one.
48
Installations
or else
The outdoor mainboard needs
dedust.
Domestic air conditioner