[ ]
* 1 E54-1/1 time flash: Low pressure sensor, E54-2/2 time flash: High pressure sensor
Error code
Remote control:
7-segment display:
LED
Green
Red
Keep
flashing
Content
5.Troubleshooting
Diagnosis
Countermeasure
YES
Save the Mente PC data of 30
minutes before stopping
Check the data of 30 minutes
before stopping
YES
Does
anomalous pressure
occur?
Is the
measured output voltage
of sensor same as that
shown in following
charactenistics?
Is the
connection of connector
of the anomalous sensor to
the contol PCB
OK?
Reset the power source and restart operation
NO
NO
YES
Is the
pressure value indicated
on Mente PC same as that
measured with pressure
gauge?
Measure the output voltage of sensor
Does
the same error
recur?
YES
NO
YES
NO
NO
*
・
Check the operation
status and record it.
・
Check it occurs soon
after power ON or during
operation or during
stopping.
・
Check sensing value.
Insert the connector of
sensor securely and restart
operation.
No anomaly in presurre
sensor & its control.
Suspect other causes
which can cause pressure
anomaly.(I.E, lack of CO₂
gas and etc...).
Temporary malfunction by
noise.
If noise source can be
specified, take a measure.
Replace control PCB.
Replace sensor.
Note:
* From the viewpoint of safety, pressure
cannot be measured with pressure gauge
during operation.
Please check pressure during stopping
operation
[Output characteristics of
low pressure sensor]
(Up to 100 bar)
[Output characteristics of
high pressure sensor]
(Up to 150 bar)
Pressure(bar)
Pressure(bar)
Output
voltage
(V)
Output
voltage
(V)
Pressure sensor output voltage : To measure beween Black-White
150
75
0
4.5
2.5
0.5
100
50
0
4.5
2.5
0.5
–
*1
E54-1, 2
High pressure/Low pressure sensor
anomaly (PSH/PSL)
* 1
All models
Detection of anomalous
pressure
(resistance) of PSH/PSL
If the pressure sensor detects
anomalous output voltage for 20
seconds continuously after turning
power ON
Or if the pressure sensor detects
anomalous output voltage for
5 seconds continuously within
2 minutes to 2 minutes and 20
seconds after the compressor ON
・
Broken sensor harness
・
Disconnection of sensor
harness connection (connector)
・
Sensor anomaly
・
Control PCB anomaly
・
Bad installation condition
・
Insufficient refrigerant amount
Condensing
unit
1. Applicable model
2. Error detection method
4. Presumable cause
3. Condition of error displayed
High pressure 0 - 140 bar
Low pressure 0 - 100 bar
User Guide | Optyma™ iCO2
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
BC408445719305en-000101 | 63
