Danfoss Optyma iCO2 User Manual page 72

User Guide | Optyma™ iCO2
Error code
Remote control:
No display
7-segment display: No display
1.Applicable model
All models
2.Error detection method
3. Condition of error displayed
4.Presumable cause
Note:
72 | BC408445719305en-000101
LED Green Red
Condensing
Stay Stay
unit
OFF OFF
5. Troubleshooting
Diagnosis
Is the
anomalous sound heard
during operation or just
after stopping operation
of condensing unit?
YE S
Does the
anomalous sound come
not only from condensing unit
but also from the
whole building?
YE S
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Is it a sound from outdoor fan?
NO
Does the
anomalous sound continue
for long period of time?
Content
Anomalous sound and vibration (2)
NO
NO
NO
Is it
a sound generated
by touching the fan
with something?
YES
NO
YES
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
Countermeasure
Condensing unit is not a cause.
If option parts is used , check the
secure connection them.
If the condensing unit is dirty on
the heat exchanger, clean it up.
Since the outdoor fan is controlled
automatically, temporary
fluctuation of rotation speed and
beat note are not abnormal.
If it is unendurable sound for the
customer, please ask our distributor.
YES
If some foreign matter like icicle is
biting, remove it.
In case of the installation in cold
region installation of snow
prevention hood on the
Condensing unit is recommendable.
Under the transitional operating
condition like starting or stopping,
the flow sound of refrigerant may be
heard, but it is also not abnormal.
Even in normal operation, flow
sound of refrigerant may sometimes
be heard, because the refrigerant is
charged in the condensing unit.
In case of the installation in a quiet
place, the low frequency sound may
be heard from the condensing unit
during the hot water operation to
fill up through the night.
If it is unendurable for the customer,
please elect sound insulation wall or
change installation location of the
condensing unit.