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Jehan Vaillant (fl. 1360–1390; also spelled Johannes Vayllant) was a French music composer and theorist. He is named immediately after Guillaume de Machaut by the Règles de la seconde rhétorique, which describes him as a "master … who had a school of music in Paris". Besides five (possibly six) pieces of music surviving to his name, he was also the author of a treatise on tuning. With Grimace and F. Andrieu, Vaillant was part of the post-Machaut generation whose music shows few distinctly ars subtilior features, leading scholars to recognize Vaillant's work as closer to the ars nova style of Machaut.

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  1. B

    Independent advice on Vaillant boilers

    We are charity with two large properties providing flats for elderly person's living independently. In the past year,we have had to replace the heating boiler in each property. This was done by British Gas who supplied and installed Vaillant boilers. We are considering making a complaint...
  2. N

    Vaillant Atmotec exclusiv - no pressure

    Hi, I'm in an Airbnb in Austria and the boiler has lost pressure. YouTube seems to suggest it's an easy fix....but I can't find the valves that are used in the videos. Any clues from the photo?!
  3. M

    How to repressurize Vaillant boiler

    Hi there, I recently moved into a new place, and I'm having difficulty finding the valves to repressurize the Vaillant boiler. I would be extremely grateful if someone could help me out! Quick video: And below are some images: Thank you!
  4. J

    Vaillant system set-up help

    Hello, I’m hoping someone can help as I’m getting differing advice every time I speak to Vaillant; We are refurbishing a property and installing a Vaillant Ecotec Plus 630 system boiler with a Megaflo cylinder. We are creating 4-zones: Downstairs rads Upstairs rads Bathroom underfloor heating...
  5. D

    Repressurise Vaillant boiler - no valves

    HI I would like to repressurise our Vaillant EcoFit Pure 625. Normally a job even an ignoramus like me can do. However we have no filler pipe and no valves. Could these be inside the case?
  6. K

    Vaillant ecoTec Sustain and an Automatic Bypass

    Hello all I hope you are well. This is my first Post here so..... I recently had a Vaillant ecoTec Sustain (Combi) installed under the ECO Grant Scheme to replace a 14 Year Old Ideal ISAR HE24. When the Ideal was installed in 2008 for my Mum there was also an Automatic Bypass (ABBV1) fitted...
  7. K

    Vaillant boiler always exceeds set temperature

    Hello. I have a Vaillant EcoFit boiler that is a few years old. We had our annual service last month and ever since then I’ve noticed something unusual. The radiator mode temperature is set to 65C but it always exceeds that, hits 70C, and then stops and the the egg timer comes on. If I check...
  8. J

    Vaillant 637 with pressure issues

    Hi there, I've recently started having pressure problems with my Vaillant Ecotec Pro 637 System boiler. When the system has been off for a while (and the water in the system has cooled) the pressure is often really low (certainly less than the min 1bar for the boiler to fire and often...
  9. J

    URGENT Drain Valve in Vaillant WH40 Low Loss Header drips occasionally-Help

    Hi all, - say equivalent of t-spoonful over a day . Can I do the following to fix it please: 1. Turn off all incoming and outgoing pipes to the Low Loss Header and remove the Drain Valve. 2. Clean the Drain Valve and apply PTFE tape to the valve and Install it back on again. 3. Turn ON all...
  10. J

    URGENT DrainValve in VaillantWH40 LowLossHeader dripsoccasionally

    Hi all, Drain Valve in VaillantWH40 Low Loss Header drips occasionally - say equivalent of t-spoonful over a day . Can I do the following to fix it please: 1. Turn off all incoming and outgoing pipes to the Low Loss Header and unscrew the Drain Valve. 2. Clean the Drain Valve and apply PTFE...
  11. O

    Vaillant Ecotec 630 plus replacement

    I have a Vaillant Ecotec 630 Plus that was installed in 2007 that is connected to a 300 litre unvented tank. This provides our hot water and feeds 4 floors of underfloor heating. I am looking to replace both the boiler and tank and see they still produce this boiler. I assume the newest models...
  12. nick_a_louse

    Air getting into upstairs radiators. Possibly caused by kettling?

    I need some help from the internet before I waste any more time and money trying to fix air getting in to my central heating! Looking for advise on what to do next, as the 3 plumbers I've used so far haven't been much use. Down in East London, near Romford for what it's worth! Issue summary...
  13. L

    Oh no... another boiler noise question!

    We have a Vaillant Ecotec 415 system boiler, about 11 years old. It has been serviced annually (most recently in Sept 2021) and we've had a couple of issues with odd noises in the past (once just after servicing), but these have been resolved by a heating engineer tweaking something or other -...
  14. R

    23 year old Vaillant Thermocompact needs replacing - flue problems?

    We built our detached house 23 yrs ago, having a Vaillant Thermocompact boiler with a Megaflo tank, and it's been excellent. The boiler sits in a room under the stairs, with the flue discharging out of the side wall (no windows or doors) at a height of around 2.5m from the ground. The...
  15. tobolerone

    I've got a buzzing Vaillant boiler, 3 plumbers say it's fine

    Hi plumbers forum, as title suggests I've got a buzzing Vaillant boiler. 3 times I've paid for people to come out and look at it. They've all signed it off as fine. Typically when they arrive it stops buzzing. It does it perhaps 3 times a day and doesn't seem to be linked to when the heating is...
  16. J

    Pre pay gas not working Vaillant Boiler

    Hi recently my pre paid gas ran out. I checked and I had 15 credits. I know my mums boiler had the same issue where it shuts off if there are only 15 credits left. She tells me an engineer comes and does something that takes 2 seconds and its working but he never told her why. Its a Vaillant...
  17. J

    Vaillant EcoTEC 831 issue

    Hi, looking for some help/advice if possible. Mum has a Vaillant EcTEC 831 ( VUW GB316/3-5 ) and the pump is constantly running. It was serviced in Sept when it started? Normally itwoulonly run when heating or hot water was required. I have managed to turn off the Comfot Mode but am unable to...
  18. M

    Vaillant VR 350f hell!

    Hello all! We recently had a Vaillant ecoTEC plus 832 installed, along with a Vaillant VRT 350f controller! I use Auto mode, and set the programme to come on every day at 6am and switch off at 11pm, and I turned the set back temp down to 5°C (can't we just have an OFF?). The controller sits in...
  19. S

    Vaillant Ecotec Plus 832 Expansion Vessel

    Hi Guys, Had a quick question regarding expansion vessel on a Vaillant Ecotec Plus 832. Was servicing the boiler and upon attaching hand pump to vessle after having drained the boiler, returns and flows isolated and drain off on boiler open, the vessle showed 1 bar charge. Was wondering why...
  20. D

    F75 fault with Vaillant when pressure is okay

    Can someone help me understand what could be causing this fault? It only seems to happen when the pressure in the boiler drops below around 1.5 - 1.7 bars otherwise it works fine. The boiler is a Valiant Eco fit pure 835 and the building is a 3 storey house with 10 radiators. Thanks