Daikin LX10F10A, Service Manual

Page: 61 / 126

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023 E431
Alarm
Logic
Humidity sensor (HuS) failure (Detect RH>120% or RH<20%)
Possible
Causes
＊ Humidity sensor (HuS) failure
＊ Contact failure of connector X20A (CPU board)
＊
Controller failure
Trouble
Shooting
1. Check if the connector X7A (CPU board) is inserted
securely.
1. If alarm is still generated, proceed
to next step.
2. Disconnect X20A and check if there is input 5V from
controller, then check the controller.
2. If there is no input 5V, then check
the controller
If there is input 5V, then replace
the HuS sensor.
X20A
V
CPU board
5V
HuS
Red
Black
Yellow
10
14
12
9
13
11
Red
Black
Yellow
B–R
B-Y : Input Voltage 5V
: Output Voltage
Controller
Action
E431 Alarm display only
024 E607
Alarm
Logic
＊ Sheet key failure (Status of the key being kept pressed lasted at least one minute)
Possible
Causes
＊ Sheet key (EC6) failure
＊ Faulty cable or connection between Sheet key (EC6) 〜 Relay board (EC5) 〜 Operation
board (EC3)
Trouble
Shooting
1. Disconnect cable connectors of sheet key, relay board, and operation board, and check their
pins visually, then securely insert the sockets.
2. If the alarm is still detected, replace the sheet key.
Controller
Action
E607 Alarm display only