I think there is a bug with the cerbo gx in the part with the temperature sensor inputs because I was constantly receiving the open circuit message, I should point out that it is powered by a 12vdc battery.
When I powered the cerbo gx at 24vdc the error disappeared and the LM335 also works excellently
Can you test another sensor?
What firmware is installed on the GX device?
I tested with the original sensor that came with the Multiplus 2.
Exactly the same problem at 12vdc -open circuit, at 24vdc it works perfectly.
Firmware v3.55.
Can you post the SN and PN of your Cerbo?
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