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  1. B

    UK Vaillant controls

    Hi all I have Vaillant 624 running 3 circuits; a Telford unvented tank and then 2 hearings circuits (downstairs & 1st/2nd floor). This is currently all run with 3x 2-port valves in and-plan+ configuration with Hive controls. I did have LLH fitted which was removed about a year ago for some...
  2. D

    Vaillant ecoTEC 824 - simplest 30kW replacement?

    Hi. Looking to replace a 13-year old 824 with a new combi as its location is being moved, so seem like a good time to also replace. The new boiler needs to be more powerful - 30kW (as against 24kW?) - as the mains supply will also be upgraded. The old 824 has actually had its pipes shifted to...
  3. L

    Vaillant echTEC Plus 838H over pressurising

    Hello. Not to long ago I took off a radiator to paint behind, since I put it on for about 2 weeks the pressure kept dropping to zero, I topped it up when I noticed it had happened, then 1 day it over pressurised and went to max, I then released some water out of the radiator, this happened a...
  4. D

    DHW supply from Vaillant turbomax 828e

    Hi, We have a combi boiler supplying dhw and c/h to our 4 bed, 2 bath house. The boiler is in a cupboard on the first floor bathroom and supplies shower, bath and sink. There is an attic bathroom with bath and sink, and a kitchen sink on the ground floor. Recently the dhw does not fire up if...
  5. R

    Vaillant Sustain 28kw Combi Heat Input

    Could anyone tell me whether the Vaillant Sustain heat input is noted in gross or net please. I was sure it was NET but someone has said it's gross which makes no sense at all. I work all my gas rates to NET so if I'm wrong my gas rates will be way out. I've included the data badge.
  6. A

    Problem with Vaillant eco tec boiler

    My 10 year old Vaillant Eco Tec Boiler pump/fan occasionally turns on for 10 secs when the cold water supply is turned off at the tap or toilet after use. If the tap is turned off slowly, it doesn't happen. Any suggestions please?
  7. I

    New Vaillant EcoTec 836, slight leak underneath, what is this connector for?

    Got a replacement combination boiler, less that 1 year old. Noticed some water from the connection pictured. Can't see what is it from the manuals, possibly a rainwater drain? Was told by the person from Vaillant that it was an A A V (auto air vent), but she didn't sound too certain! Can...
  8. B

    repair 13 year old Vaillant for £700 or buy new one for £3100 inc labour

    Vaillant Ecotec Plus 832 boiler is 13 years old, 4 of which since we've been living there, started to play up in last couple of months. An engineer with very good reviews came round and says it will cost 700+VAT for 'replacement expansion vessel, pressure relief valve and diverter valve on...
  9. Z

    Vaillant VR10 with a vented cylinder?

    Hi, I was hoping to replace an old system boiler with a Vaillant Ecotec Exclusive 627 system boiler, thats the one with the diverter valve so no need for zone valves, controling it with a V-Smart and a VR10. I've spoken to Vaillant Tech and they said you cannot use the VR10 with a vented...
  10. liopik

    Vaillant no power. Switches on for few seconds only.

    Hi everyone, I'm hoping to get some advice on an issue I'm having with my Vaillant Ecotec Pro 24 boiler (R1 PCB). It was installed in 2013 and has worked perfectly up until this week. When the boiler does start, it runs for a few seconds, makes some noises, and then shuts down again. I've...
  11. Stigster

    New Vaillant filling loop required.

    Hi Folks, Where is the place to order a Vaillant filling loop, please? I looked around on the net but can't seem to find it as a kit. I'm not doing the job but he wants to know what to buy and replace it himself and asked me where to get one. I said I'd have a mooch. He sent this picture. I...
  12. B

    Vaillant Eco Boiler not working query

    Hi all I have a Vaillant eco boiler at a new house I moved into last week. It’s a combo boiler and the last boiler I had was old (and much easier to use!) This one keeps turning itself off. The hot water seems to work and is always warm. The heating also works but for random amounts of time...
  13. W

    Vaillant ecoTec Plus 630 boiler not reaching target temp

    I recently had a new 2023 Vaillant ecoTec plus 630 (30kW) system boiler installed along with a Low Loss Header (LLH) in my house. I have 21 rads in the house and a room with UFH. The LLH was introduced as I was finding (before the LLH was fitted) that my old boiler (Vaillant heat-only boiler)...
  14. T

    Vaillant eco plus 837 System loosing pressure.

    I have a Vaillant eco plus 837, year installed 2008. It works well. We have one large zone for the house with 13 rads running off it. We also have an UFH zone in the kitchen. Near the boiler I have 2 port valves which control this part of the system. The boiler has been loosing pressure...
  15. C

    AAV closed in Vaillant boiler for many weeks - how risky?

    I got my regular annual boiler service for my Vaillant ecoTek 930 about a month ago, and the engineer identified that the AAV was leaking, so he closed it. This is a tenanted property and it's not straightforward to get access to it. How risky is it to / how long can I leave the AAV closed...
  16. H

    Vaillant ecotex 831 - heating only working in service mode

    Wishing everyone on tgmhis forum a very happy Christmas!! I am working on a combi boiler which has problem with heating only. Water is heating normally. Here are the symptoms 1. Signal from thermostat is not firing the boiler. It does not make any sound when heating is on from thermostat. 2...
  17. D

    Vaillant boiler change in operation

    My Vaillant boiler now only fires up for around 30 secs then goes off. The egg timer symbol then appears and flashes for several minutes. After that it fires up again and heats the rads. Would be grateful if anyone could suggest why this is happening. Thanks.
  18. B

    Vaillant boiler taking ages to get to target temperature

    Hi all Wondering if you could help with this strange issue. I have a Vaillant ecotec 637 (set to 20kw part load) which was connected via a LLH to my system of 3 zones; DHW and 2 radiator zones. The gas usage was high and didn’t feel the boiler was modulating, so yesterday I decided to remove...
  19. G

    Vaillant Controls - is it possible to mix wired and wireless?

    We have an all Vaillant setup - an EcoTEC Plus 637 system boiler plus wired VR720 and VR92 SensoCOMFORT controller, driving two CH zones plus DHW. It all works, but unfortunately we have found that the room stats are poorly located, and so the level of control is not what it should be. We had...
  20. nick_p

    Vaillant Ecotec system boiler with VR66 and Opentherm (VR33 and Nest)

    Hi everyone, Just wanted to share my experience with "upgrading" an S plan setup to Opentherm and Vaillant Control Center (VR66). There are a few threads on a few different forums but I wanted to share a full write-up with all the steps needed, benefits and costs. Overall, I fully recommend...

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