I’m having trouble connecting the Vaillant VR940F module to my TurboTec Plus boiler (manufactured in 2015).
What I’ve done so far:
1. Connected the module to the BUS terminals on the boiler.
2. Checked the voltage on the BUS — it’s 21 V, which seems fine.
3. Tried switching the polarity of the BUS wires, but it didn’t help.
The app keeps showing an error saying the boiler cannot be found.
If anyone has faced a similar issue or knows what I could try next, I’d really appreciate your advice. I’m attaching photos of the setup to provide more context.
Thank you in advance!
