Daikin LX10F11B - Page 67

2-39
029 Communication Interrupted
（E903）
Alarm
Logic
A communication error between CPU board and operation board
Possible
Causes
1. Open circuit between operation board (EC3) and CPU board (EC1)
2. Operation board failure
3. CPU board failure
Trouble
Shooting
Step 1. Check if the connector of cable between operation board （EC3) and CPU board （EC1)
is inserted securely.
Step 2. If there is no connection error between both boards, it seems to be operation board or
CPU board failure.
Replace in order starting from the CPU board.
Controller
Action
Communication Interrupted（E903） Alarm display only
（"Communication Interrupted" is displayed on LCD and E903 is recorded on trip report.)
0219-44LX10F11BEn.indd2-390219-44LX10F11BEn.indd2-39 2014/11/1916:38:112014/11/1916:38:11
https://daikin-p.ru