I just bought 4 Eve Thermo (Second generation) and tried to install them on my heaters. I am using a M30x1 to M30x1.5 adapter from Oventrop (bought on, metal version, should be the first listing at the top).

Eve Thermo starts calibrating, you can hear the valve opening and closing but it always fails at about 75% of the progress bar giving me a „general installation error“. Resetting did not help either.

Any ideas that could get these things running? I can provide pictures of my heater when needed.
Oct 14, 2020