[hannu_911]

Did you add oil at any point?
Which oil did you add? PAG or POE?
What oil does the sign on your compressor say it has been prefilled with?

As you can see CR manual has been stating to use PAG oil until summer 2022, only version 1.5 changed the recommendation.
The label on my compressor says ZEROL ESTER 68SL 100ML.
It has been manufactured 2019.

I believe PoE and PAG don’t mix well and should not be used together.

Install manual v1.5
"System as shipped does not need compressor oil added. The compressor is pre-filled with PoE oil
but PAG oil can be used. Although this is an electric compressor, it does not need special oil as it is a
12V system. Please note that other systems we offer which run at higher voltages ( for example
400V EV systems) must use PoE oil."

Install manual v1.4A and earlier
"System as shipped does not need compressor oil added. The compressor is pre-filled with PAG oil.
Although this is an electric compressor, it does not need special oil as it is a 12V system. If extra
condensers are used more oil may be added."