Daikin LX10F11B Service Manual page 63

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E425
（USDA1）
022
E429
（USDA3）
Alarm When USDA sensor type "2" is set on ※12 Configuration set in paragraph 2.3
Logic
USDA sensor / CTS
Note: The alarm is activated when sensor or the circuit is disconnected (open) or short-circuited.
Possible 1. Incorrect setting (Setting number of USDA sensor is not match)
Causes 2. Device malfunction
Connector disconnected / open wire / short circuit / USDA receptacle failure
3. USDA sensor failure
* Controller failure
Trouble Step 1. If USDA is set to "3" or "4" in ＊2 mode setting of paragraph 2.3, check whether all of
Shooting three or four sensors are connected.
Step 2. Check whether cable or receptacle between X6A and USDA receptacle is open or
short-circuited.
After make jumper between pins A̶B on USDA/CTS receptacle, check the continuity
on socket X6A (CPU board).
8
7
6
5
4
3
2
1
（CPU board）
Repair or replace if there is disconnection or short circuit.
Step 3. Check the resistance value for each sensor of USDA and CTS sensor
Replace sensor, if does not matches the resistance and USDA sensor
characteristic table.
Caution:
Regarding USDA sensor, type "1" and "2" have different characteristics.
Identify the type by referring ＊4 Configuration Information in paragraph
2.3 (configuration setting information).
Step 4. If the sensor is normal, replace the controller.
Controller E425 Alarm display only
Action E427 Alarm display only
E429 Alarm display only
E433 Alarm display only
・ E427
（USDA2）
・ E433
（CTS）
≦-39℃ (320kΩ)
or
≧96℃ (0.79kΩ)
X6A Sensor receptacle
(inside container)
Continuity check (Connector X6A）
USDA1
USDA2
USDA3
CTS
USDA1
USDA2
USDA3
CTS
2-35