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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 withthermometer.
Insert the connector
securely
Replace the temperature
sensor.
Replace the control PCB of
condensing unit.
Detection of the anomalously
low temperature (resistance
value) of gas cooler temperature
sensors
All models
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:
*1 E37-1, -2: Tho-G1, -G2, E37-3: Tho-M, E37-4: Tho-INJ1, E37-6: Tho-SC, E37-7: Tho-R
*2 According to the kinds of sensors, from 1 to 7-time flash or keep flashing
[Temperature-resistance characteristics]
Gas cooler temperature sensor (Tho-G2)
Middle pressure receiver inlet temperature sensor (Tho-M)
Gas injection inlet temperature sensor (Tho-INJ1)
Subcooling coil temperature sensor (Tho-SC)
Liquid feed pipe temperature sensor (Tho-R)
Resistance
(kΩ)
Resistance
(kΩ)
Temperature(°C)
Temperature(°C)
Error code
Remote control:
7-segment display:
LED
Green
Red
Condensing
unit
Keep
flashing
*2
Content
–
*1
E37-1 to -7
Gas cooler temperature sensor (Tho-G1, 2) anomaly Middle pressure
receiver inlet temperature sensor (Tho-M) anomaly Gas injection inlet temperature sensor (Tho-INJ1) anomaly
Subcooling coil temperature sensor (Tho-SC) anomaly Liquid feed pipe temperature sensor (Tho-R) anomaly
Gas cooler temperature sensor (Tho-G1)
100
90
80
70
60
50
40
30
20
10
0
-20
0
20
40
60
80
100
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. Applicable model
2. Error detection method
3. Condition of error displayed
4. Presumable cause
User Guide | Optyma™ iCO2
50 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030