*1 Check several times to prove any poor connection.
[Temperature-resistance characteristics]
Under-dome temperature sensor (Tho-C1, 2)
Temperature (°C)
Resistance (kΩ)
Error code
Remote control:
7-segment display:
LED
Green
Red
Keep
1-time
flash
flashing
Content
–
E55-1
Under-dome temperature sensor (Tho-C1) anomaly
5.Troubleshooting
Diagnosis
Countermeasure
NO
YES
Is the
connector of the
anomalous sensor
connected
properly?
Ar e
the characteristics
of sensor OK?
*1
NO
Save the Mente PC data of 30
minutes before stopping
YES
・
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 under-dome
temperature sensor
(Tho-C1).
Replace the control PCB of
condensing unit.
Note:
100
90
80
70
60
50
40
30
20
10
0
-20
0
20
40
60
80
100
All models
Detection of anomalously low
temperature (resistance) of
temperature sensor. (Tho-C1)
・
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 -50°C or
lower temperature for 5 seconds
continuously
Condensing
unit
1. Applicable model
2. Error detection method
4. Presumable cause
3. Condition of error displayed
User Guide | Optyma™ iCO2
64 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
