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vaillant

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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
  10. 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...
  11. 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...
  12. 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
  13. 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?
  14. 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...
  15. T

    Vaillant EcoTech Boiler Heating Partial Load auto feature

    It appears that the auto feature (D0) is no longer working on my boiler. My rads are taking 45 mins to get warm and the flame is now a lot lower than it used to be. I have tried gradually increasing the kw on partial load. I started using 14kw (have 9 rads) no change, and it only kicked in when...
  16. J

    F.22 Vaillant EcoTec Plus 630 - can't locate filling loop

    Hello - I have an f.22 error on this system boiler, 0.4 bars. Just moved into this house so not certain on how everything works. There are no taps under the boiler to add more water. There is a hot water cylinder in the cellar so thankfully it's just heating that we have lost. With this...
  17. L

    Opinions on this : Vaillant Boiler Fitted with "Vaillant protection filter " on the flow

    All feedback welcome ! Here are a few details . 1.New Ecotec Vaillant boiler fitted ."protection kit/filter " paid for to get 10 year Guarantee etc . 2.Vaillant filter fitted on flow for No reason . This was coming up to 2 years ago. 3.Install company then serviced it and failed to notice...
  18. TallulaB

    Vaillant auro stor water heater issues

    Hello, Hoping someone can help! Not sure what else to try. We have a Vaillant eco tec boiler and we also have a Vaillant auro stor water heater, but for the last two months all of our hot water is coming out Lukewarm. When we first moved in it worked perfectly and the water was super hot. Our...
  19. Mark97

    Vaillant ecotec 615 help

    Hi. Boiler is a vaillant ecotec 615 unvented system boiler. I have changed the diverter valve plastic body (obviously no diverter valve in it). I had a tiny drip between this and the pump housing, so I have replaced this and replaced all seals around this and the pump. Upon running the boiler...
  20. T

    Vaillant System Boiler and Megaflow Installation

    Hello, I have open vent old Ideal boiler (in the kitchen)with open vent hot water cylinder.(on first floor cabinet) We would like to change the boiler to Vaillant Ecotec Plus 624 system boiler and 210i unvented indirect Megaflow cyclinder. How much it will cost the labour? How long it will take...

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