Daikin LX10F11B3 Service Manual page 68

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029 Communication Interrupted
Alarm
A communication error between CPU board and operation board
Logic
Possible 1. Open circuit between operation board (EC3) and CPU board (EC1)
Causes 2. Operation board failure
3. CPU board failure
Trouble Step 1. Check if the connector of cable between operation board （EC3) and CPU board （EC1)
Shooting 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 Communication Interrupted（E903） Alarm display only
Action （"Communication Interrupted" is displayed on LCD and E903 is recorded on trip report.)
030 F106・ E106
Alarm
Abnormal compressor operation
Logic
Possible
Wiring connection mistake between the compressor and the inverter board (EC8)
Causes
Trouble Step 1. Check the colors of the wires connected to U, V, and W on the inverter board (EC8).
Shooting (U - red, V - white, W - black)
Step 2. Check the colors of the wires connected to U, V, and W in the compressor terminal box.
(U - red, V - white, W - black)
(Refer to paragraph 4.8.1 Parts Replacement, Compressor .)
Step 3. After checking the wiring in the above steps, if an alarm occurs, replace the compressor.
Controller F106 Unit stop.
Action E106 Restart after 3 minutes of standby
031 E441
Alarm
CPU board (EC1) temperature sensor failure
Logic
Possible
The internal temperature sensor of the CPU board (EC1) is malfunctioning.
Causes
Trouble
Replace the CPU board (EC1).
Shooting
Controller
E441 Backup operation
Action
（E903）
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