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017
E405
（DCHS1）
Alarm
① DCHS1, 2≦-33℃ (687 kΩ) & 1 minute elapsed.
Logic
② DCHS2≦AMBS & compressor speed is 53 rps or more
③ DCHS1, 2≧187℃ (1320 kΩ) & 3 minutes elapsed.
Note 1: If the outside air temperature is -15℃ or lower, no judgment is made during startup
control.
2: The alarm is activated when sensor or the circuit is disconnected (open) or short-
circuited.
Possible
＊Faulty contact of connector X16A, X20A (CPU board)
Causes
＊Temperature sensor failure
＊Controller (CPU board) failure
Trouble
Step 1. Check connector X16A / X20A and make sure it is properly installed.
Shooting
Step 2. Disconnect X16 and X20A and check the sensor
resistance values.
X16A
17
X20A
5
If the resistance value matches the temperature
sensor characteristic table (refer to 5.2
temperature sensor characteristics), the sensor
is normal.
Step 3. Check that DCHS2 is correctly installed on the compressor.
Step 4. Check the controller (CPU board).
When E405 (DCHS1 failure), Backup by DCHS2
When E439 (DCHS2 failure), Backup by DCHS1
・ E439
（DCHS2）
DCHS1
18
6
DCHS2
2-31
Example of sensor resistance value
measurement (Connector X20A)
* Contact to the connector pins
correctly.
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