Error code
Remote control:
7-segment display:
LED
Green
Red
Keep
flashing
*2
Content
–
E39-1 *1
5.Troubleshooting
Diagnosis
Countermeasure
Is the
connector of the anomalous
sensor connected
properly?
NO
YES
Save the Mente PC data of 30 minutes
before stopping
NO
Are
the characteristics
of sensor OK?
*3
YES
*3 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.
Replace the control PCB of
condensing unit.
• 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
If the sensor detects
anomalously low temperature
for 20 seconds continuously
after power ON.
Detection of anomalously low
temperature (resistance) of
temperature sensor
Note:
[Temperature-resistance characteristics]
Discharge pipe temperature sensor (Tho-D1)
Resistance
(kΩ)
Temperature(°C)
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
-30 -10
10
30
50
70
90 110 130 150
*1 E39-1: Tho-D1
*2 E39-1: 1-time flash
Condensing
unit
All models
1. Applicable model
2. Error detection method
3. Condition of error displayed
4. Presumable cause
Discharge pipe temperature
sensor (Tho-D1) anomaly
User Guide | Optyma™ iCO2
52 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
