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vaillant

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  1. S

    Vaillant boiler start up question……..

    Hi, I have a Vaillant Ecotec Plus 637 condensing boiler and its working okay, serviced about a year ago. Just something I noticed the other day, when the central heating program or hot water program (it heats an unvented cylinder twice a day) come on there is a 3 minute or so delay for the hot...
  2. 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!
  3. 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...
  4. 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?
    • DerekB
    • Thread
    • boiler vaillant valves
    • Replies: 2
    • Forum: Boilers
  5. 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...
  6. 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...
    • kilodelta
    • Thread
    • boiler vaillant
    • Replies: 69
    • Forum: Boilers
  7. 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...
  8. A

    Where's the water coming from?(Vaillant boiler internal)

    Hello again I just had a problem with a leaky flu which has been fixed but now I notice there is also a water appearing in a tiny pool at the base of the boiler. Am I right that it's the water leaking from where the central heating return pipe enters the boiler ? Is this a difficult fix...
    • atinwi
    • Thread
    • boiler vaillant water
    • Replies: 4
    • Forum: Boilers
  9. 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...
  10. 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...
  11. Scott_D

    Vaillant Ecotec Plus 46kw

    I have been asked to service one of these boilers 2 years old but I haven't dealt with one before. Is it just a big ecotec or different heat exchanger? Anything to look out for?
  12. 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...
  13. 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...
  14. 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...
    • JimmyAcc
    • Thread
    • boiler gas engineer vaillant
    • Replies: 16
    • Forum: Boilers
  15. 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...
  16. 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...
  17. 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...
  18. 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
  19. 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...
  20. 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...
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