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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. 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...
  2. J

    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...
    • Jason smith27453
    • Thread
    • advise america drain drips header low loss usa vaillant valve
    • Replies: 0
    • Forum: USA
  3. 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...
  4. 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...
    • oxgman
    • Thread
    • america ecotec plus replacement usa vaillant
    • Replies: 11
    • Forum: USA
  5. 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...
  6. 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 -...
  7. 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...
    • Roger123k
    • Thread
    • america flue needs old problems replacing usa vaillant year
    • Replies: 6
    • Forum: USA
  8. tobolerone

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

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    • tobolerone
    • Thread
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    • Replies: 6
    • Forum: USA
  9. 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...
  10. 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...
  11. D

    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...
  12. 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...
  13. 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
  14. J

    Viessman vs Vaillant and Honeywell vs Tado vs Hive

    I am trying to help my dad decide with a boiler replacement, can't decide between Vaillant Ecotec Pro 30kw or Viessmann Vitodens 100 30kw. The boiler will be going in the exact same spot as before. Both will have a system cleanse, inhibitor and magnetic filter (I am not sure which brand or...
    • Justice League
    • Thread
    • america hive honeywell tado usa vaillant viessman
    • Replies: 4
    • Forum: USA
  15. F

    12 year old Vaillant Eco Tec Plus 415 keeps turning off

    Hello, can anyone advice me on my Vaillant Ecotec plus 415. The boiler starts up but switches off after a few minutes. If the temp dial is turned up then it makes a very loud banging and flapping sound. I was advised to get system flushed by one company and another said the boiler is old i...
    • Finn321
    • Thread
    • america eco keeps old plus turning usa vaillant year
    • Replies: 1
    • Forum: USA
  16. B

    Vaillant 630 weeping cracked plastic manifold

    Hi All - has anyone else had weeping from a hairline crack in the black plastic manifold where the flow comes out of the burner? See pic. Looks like you can replace the whole thing, but can’t find a part number. Can anyone help? Might just be calling it the wrong thing!? Thanks, Andy
  17. J

    Vaillant boiler incorrectly showing no pressure

    My boiler is starting to randomly drop to zero pressure and turn off. When I go down to the cellar and open the filling loop, it instantly jumps back up to 1.5 Anyone ever seen this before?
  18. J

    Radiators not getting heated due to hot water priority

    Hello all, I live in Lisbon, Portugal and having a hard time getting good advice on my heating system: Vaillant Ecotech plus boiler, Vsmart controller and 200L Junkers hot water tank. I understand the system prioritises hot water but it is to the extent that in normal operating mode the...
  19. B

    Vaillant ecoTec plus 637 System boiler control options

    Vaillant ecoTec plus 637 and gledhill 250 indirect tank control options Hi, I am in the process of renovating an old farm house. I have been advised to have installed the Vaillant ecoTec plus 637 system boiler with a gledhill 250l indirect tank. I met with the heating engineers yesterday as...
    • Blondie44
    • Thread
    • boiler control controls ecotec ecotec plus options plus setup system system boiler vailant vaillant wireless
    • Replies: 11
    • Forum: Central Heating Forum
  20. B

    Vaillant ecoTec plus 637 sensiocomfort control setup

    Vaillant ecoTec plus 637 and gledhill 250 indirect tank control options Hi, I am in the process of renovating an old farm house. I have been advised to have installed the Vaillant ecoTec plus 637 system boiler with a gledhill 250l indirect tank. I met with the heating engineers yesterday as...
    • Blondie44
    • Thread
    • america comfort control ecotec ecotec plus plus sensio setup system boiler usa vaillant
    • Replies: 0
    • Forum: USA
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