5.Troubleshooting
Diagnosis
Countermeasure
Is the
connector of the anomalous
sensor connected
properly?
NO
YES
Save the data 30 minutes before stopping
into the Mente PC
NO
Are
the characteristics
of sensor OK?
*1
YES
*1 Check several times to prove any poor connection
• Check the operation status
and record it.
• Check it occurs soon
after power ON or during
operation or during stopping.
• Check sensing value
• Compare the temperature
shown in Mente PC data
to the acutal temperature
measured with thermometer.
Insert the connector
securely.
Replace the temperature
sensor (Tho-A).
Replace the control PCB of
condensing unit.
Detection of anomalously low
temperature (resistance) of
outdoor air temperature sensor
(Tho-A)
If the sensor detects anomalously
low temperature for 20 seconds
continuously after power ON
• Broken sensor harness or
the internal wire of sensing
section (Check the molded
section as well.)
• Disconnection of sensor
harness connection
(connector)
• Control PCB anomaly
Note:
[Temperature-resistance characteristics]
Outdoor
Error code
Remote control:
7-segment display:
LED
Green
Red
Keep
flashing
1-time
flash
Content
–
E38
Outdoor air temperature
sensor (Tho-A) anomaly
Resistance
(kΩ)
Temperature(°C)
100
90
80
70
60
50
40
30
20
10
0
-20
0
20
40
60
80
100
Condensing
unit
All models
1. Applicable model
2. Error detection method
3. Condition of error displayed
4. Presumable cause
User Guide | Optyma™ iCO2
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
BC408445719305en-000101 | 51
