Haier 2HUM18HC03/R2 - The Communication Fault between Indoor and Outdoor

2HUM18HC03/R2(DB)-SM Wiring diagrams
60
Domestic air conditioner
7.3.10 The communication fault between indoor and outdoor

Indoor display E7
outdoor display LED1 flash 15 times
Method of
Communication is detected by checking the indoor PCB and the outdoor PCB
Malfunction
Detection
Malfunction Ŷ
The outdoor PCB broken leads to communication fault
Decision Ŷ
The indoor PCB broken leads to communication fault
Conditions
Supposed Ŷ Communication wiring disconnected
Causes Ŷ
The indoor PCB is broken
Ƶ
The outdoor PCB is broken
Ƶ
The Module PCB is broken
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
NO
˄A˅
Yes
NO
Yes
No
YES
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
dedust.
1. Reconnect the linking cable;
2. Replace the linking cable with new
one.