Radiator valve reading humidity

Hi all

My Devolo (same as Danfoss) TRV’s have started to read humidity and luminance , well some of them​:open_mouth:. This is weird because as far as I’m aware they don’t have these sensors in them, or do they. I’m sure they are not proper readings as they don’t change , well so far. Anybody come across anything like this before on similar valves or other kit. I’m more curious as to how it’s happened after running them for over a year. Thank all in advance :+1: