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  1. R

    Boiler bypass always opening

    Ok here you go, on cp1. Hot water only. System has just started after doing one shower yesterday eve.
  2. R

    Boiler bypass always opening

    Yep that's it. Here is mine
  3. R

    Boiler bypass always opening

    OK cool, thanks. CP1 it is and I will have a look at the performance when the hot water next fires
  4. R

    Boiler bypass always opening

    I suspect there may be some scaling on the HW tank coil, which accounts for the boiler going into S46. It's not dissipating enough heat which Vaillant have confirmed. Grundfos recommend one of the 2 proportional pressure settings (higher or lower) for my setup as the CP ones are designed for...
  5. R

    Boiler bypass always opening

    Easier than that - I had a pic. Anyway I am, solved. One question given you clearly have a good understanding, now it's summer and it's pretty much hot water only for the next few months, would you go pp1 or pp2 given my setup? PS That Isolator is open now - it was only closed while it helped me...
  6. R

    Boiler bypass always opening

    Easier than that - I had a pic. Anyway I am, solved. One question given you clearly have a good understanding, now it's summer and it's pretty much hot water only for the next few months, would you go pp1 or pp2 given my setup?
  7. R

    Boiler bypass always opening

    Cheers for this. Tank coil has a bleed valve so it's not that. Could be limescale, though it's not old. Hard water area though. It was all power flushed but whether he did the tank circuit or not i don't know. I know it's not the ABV though if you look at my other reply. I don't know if there is...
  8. R

    Boiler bypass always opening

    Thanks so much for coming back - great forum! However, I have solved the issue. It was driving me so mad I drained a little off the system, split the bypass and put in an isolation valve. When I ran it all up again the whole bypass pipe got hot EXCEPT the short length between the ABV and the...
  9. R

    Boiler bypass always opening

    By the way if it's been on hot water only (roasting hot bypass pipe) and I boost the heating the pipe then goes cold immediately because the cold water from the heating system starts going around the system and straight through the bypass valve as well. This even happens with the pump on its...
  10. R

    Boiler bypass always opening

    Hi all - hopefully I can get some answer to a maddening issue. The boiler bypass just refuses to stop letting water through. Here is the run down. We bought the house last year. It has a Vaillant Ecotec Plus 418 which is only 3 years old. It's on a Y plan, with a hot water cylinder that looks...

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