Daikin LX10F11B Service Manual page 64

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023 E431
Alarm
Humidity sensor (HuS) failure (Detect RH>120% or RH<20%)
Logic
Possible ＊Setting is incorrect
Causes ＊Humidity sensor (HuS) deteriorated
＊Contact failure of connector X20A (CPU board)
＊Controller failure
Trouble Step 1. Replace the humidity sensor.
Shooting Step 2. Check connector X20A (CPU board) and connector on the Humidity sensor cable
located below fan deck.
Make sure it is properly connected.
Step 3. Turn on the circuit breaker and check if there is DC5V input from the controller.
DC 5V
V
9
Red
11
Yellow
13
Black
Sensor
name
Humidity
sensor
Step 4. Replace the CPU board.
Controller
E431 Alarm display only
Action
024 E607
Alarm
＊Sheet key failure
Logic
Possible ＊Sheet key (EC6) failure
Causes ＊ Faulty cable or connection between Sheet key (EC6) 〜Relay board (EC5) 〜Operation
board (EC3)
Trouble 1. Disconnect cable connectors of sheet key, relay board, and operation board, and check
Shooting connector pins visually, and secure insert correctly.
2. Replace the sheet key if the alarm is repeated.
Controller
E607 Alarm display only
Action
CPU board
Black – Red
Black – Yellow
X20A
10
12
14
Pin No.
（Connector X20A）
11 13
12 13
: Input Voltage DC5V
: Output Voltage
Red
HuS
Yellow
Black
Voltage value
DC 5V
refer to 5.4 Humidity Sensor Characteristics
2-36
Example of voltage check
(Connector X20A)