Lectrician
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The Room Stat has connections for:
1 - LIVE IN 2 - NEUTRAL IN 3 - LIVE OUT (to fire boiler)
The boiler (by my manual):
3 - LIVE OUT 4 - LIVE IN (to fire) 5 - NEUTRAL OUT
So, what you describe in your post is correct.
However.
When I google the manual for the PRO model, Vaillants site doesnt show a 3, 4, 5 - It shows an L, N, Lr (Lr being the return to fire). 3, 4, 5 are for internal boiler wiring.
Have you a photo of your connections in the boiler?
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