Hi Process Paul, I bought a glow worm sensor for £45.60 from local supplier. They told me that if it had a seal that i couldn't return it if it didn't work. It didn't have a seal .
Anyway, as soon as i got home i pressed the search button on the vaillant boiler which was flashing yellow ( this...
Hi there, thanks you for your post. I have a VRC 470f room controller and I know that the external weather compensationg sensor model VR 20 has stopped working. Prices from vaillent are in the £180+VAT region just for the sensor !! So dead interested in your glow worm solution, but unable to...