• Welcome to PlumbersLive.com - Please register for free, or login if you have an account here already. We have relaunched the forum with new forum software and a nice new feel to it. Find common questions related to Boilers, Central Heating, Gas Engineering, Water Plumbing, Bathroom and Kitchen Remodeling - all in our forums.


  1. Dan

    Vaillant one of the least installed boilers?

    Vaillant don't seem to be one of the most talked about boilers going. Is it because they're a newer company, or perhaps one that doesn't exist anymore? or something else?
  2. Dan

    Welcome to the new Vaillant Boiler Forums

    Welcome to the new Vaillant Boiler Forums. Post a new thread or question in this forum if you have any questions about Vaillant boilers.
  3. R

    Very loud Vaillant water heater, video provide

    I have a solar powered water heater, on some days its extremely loud for a few hours. Most days it's silent and there's no noise when the sun goes down. First video is with the cover on when it's making the most noise View: https://youtu.be/AgFyb34Ej9s Second video when it calms down a...
  4. M

    Vaillant filling loop leak

    Afternoon all, My boiler pressure is slowly rising above green every other week and I've located the leak to be the check valves on both sides of the filling loop. Is there anyway I can cap one side off untill I can buy a new part? Furlough has made it hard financially atm. I've included a...
  5. P

    Help me understand my Vaillant boiler!

    Hi All, The house we moved in to a year ago has a Vaillant Ecotec 428 fitted and I'm trying to get my head around how it works. This is my first time as a home owner and never lived in a property in which I've had access to the boiler until now, so trying to get my knowledge to where it should...
  6. D

    URGENT Vaillant 824E 50p model

    I’m after installation service manual for vaillant Ecomax 824 E ( 50p model ) gc 47 044 07 tried Vaillant they don’t have copy can’t find on line or on my many downloads davidfal
  7. G

    Vaillant ecoTEC Plus 938 - Low Flow Rate

    Hi guys. Hope you are able to help me, and thank you in advance for anyone who can contribute. I've got a Vaillant 938 and notice that the hot water output isn't near the claimed flow. I've tested the pressure at the stop cock and it's around 3 bar. I've tested the cold flow rate from the...
  8. P

    Vaillant Ecotec vertical flue minimum distance from soil pipe

    Hi All Has anyone ever questioned the reasons why Vaillant MIs for their vertical flue termination refer to damp exhaust air escapes from “channel vents” may condense in the air pipe and cause damage to the product, this would suggest that the flue terminal has to be at least 1 meter away on...
  9. J

    Vaillant Ecotec Plus 824 F75 fault

    Hello Our Vaillant boiler has developed a fault in the last 2 weeks. The hot water is working without any problems. However, within 15-20 minutes of turning the heating on we are getting the error message 'F.75 Fault. Pump water shortage'. The boiler being on for heating is pushing the filling...
  10. K

    Vaillant ecotec 937 noise

    Hello all, My 1st post, here goes My boiler has developed a funny noise that can only be described as like when you finish a drink through a straw and suck up the last bit from the bottom.. that noise? The noise is coming from underneath the boiler and only does this when the hot water tap is...
  11. G

    Vaillant condensate into washing machine stand pipe

    hi, i have a 40mm boss connection at the top of a horizontal soil stack that runs in the room. I'm intending to put a washing machine stand pipe at the end of this. I also have a Vaillant ecotec pro 28 boiler next to where the washing machine will sit and was hoping to get the GSR to reroute...
  12. B

    Servicing for Arotherm Vaillant 15KW Air Source Heat Pump (ASHP)

    Moved into a new property around 4 years ago with full 15Kw Vaillant Arotherm ASHP setup, after quite a few initial teething problems seems to run well over last couple of years. Long term just wondering if anyone can advise on servicing (in Berkshire area). Are there any independent specialist...
  13. R

    Vaillant Eco Tec Pro 28 fault.

    Over the last couple of weeks my boiler has started to throw the occasional S.54 and F.64 codes. I know when its happened because the hot taps run cold. The whole system is 8 years old and has been serviced every other year. Normal service is resumed by pressing the reset button. The question is...
  14. C

    Vaillant ecotec pressure dropping

    Hi folks, hopefully someone can help as this problem is doing my head in. Sorry for the long story but just want to fill in on what’s going on. Father in-laws boiler was dropping pressure with no sign of leaks on system. I checked expansion vessel and it had lost charge so must’ve been...
  15. G

    Vaillant ecoTEC plus 618.

    I have a become aware that the boiler seems to be cycling. I have 2 zones with a programmer in the hall and one on the landing. Once the desired temperature has been reached I have noticed on the boiler panel, that when the temp drops to about 45C the boiler fires up and then when it gets to...
  16. G

    Vaillant EcoTec Plus

    Hi Everyone. I am hoping that someone could help me with a problem I have with a Vaillant Eco Tec Plus, that was fitted last year in March. When it was first fitted I noticed that it took more than 30 minutes for our radiators, to get warm, our old boiler would heat it in about 10 minutes. I...
  17. J

    Vaillant eco tec 28 f28

    Hello hope someone can help. So this morning woke up to a f28 on my Vaillant eco tec pro 28.so did the usual things checked standing pressure and working pressure by three rings on the hob all good.just to be safe called cadent to check the regulator to make sure nothing was wrong on that side...
  18. Z

    Will a Vaillant 150 Timeswitch fit and older Ecotec?

    I've got an older Vaillant Ecotec combi with a 130 Timeswitch that's broken, can the newer 150 timeswitch be used on it rather than paying over the odds for a 130? I know you can put the pins in a couple of different positions but can't remember if it fits the older ones or not. Thanks in advance
  19. kenjiru

    Thermostat for Vaillant ecoCOMPACT

    Hello guys, I have a Vaillant ecoCOMPACT VSC 206/4-5 90 boiler with an multiMATIC 700 module already installed. I've recently converted the house from radiator heating to under floor heating. What's the best solution to add a wireless thermostat to it? I've looked at the following solutions...
  20. King Mustard

    Vaillant TURBOmax VUW boiler making "cracking" sound

    We started renting a house nine months ago. The house is just over 20 years old and has a Vaillant TURBOmax VUW boiler. The boiler seems quite old so may have been installed with the house? It's regularly serviced but, as of two weeks ago, it started making a "cracking" sound most of the time...
  21. K

    Vaillant ecotect pro 28 boiler droning noise - video

    recently the boiler has started the noise as in the videos. No idea where to start from. The boiler is used rarely, but for a while the top up valves where open which meant the pressure was always high when the boiler was on, this was fixed but the has started a while after the valve was turned...
  22. 5

    Vaillant 838 operations

    Fitted a Vaillant 838 Eco Tech plus combination boiler to a property 6 weeks ago. all fine. Customer called in to say that the boiler had locked out on F54 and F28. Reset did it again a few hours later, then been fine since. I attended today to check a few thing:- 1. Gas pressure at the meter...
  23. P

    Vaillant boiler noise

    Got a vaillant ecotec boiler and it makes an awful noise sometimes which stops when the hot water tap is turned on, boiler is fully serviced and clean, couldn’t get it to replicate for the last service so the engineer couldn’t find anything wrong!
  24. F

    Mysterious loss of pressure on Vaillant EcoPro?

    Can anyone offer any advice on a total mystery pressure loss on a Vaillant Eco Pro 28 combi boiler? Here's the background: Almost total pressure loss every 1-2 hours. Apparently the equivalent of several pints of water each time When pressure is up, heating and hot water functioning fine, so...
  25. J

    Vaillant Ecotec plus 824

    Hi Hope someone could help me on this. i have a Vaillant Ecotec plus 824 boiler. i have leak ( see attached picture) please some let me know what part it is and could it repairable? Thanks in advance
  26. J

    Vaillant Vsmart v Vrc700

    My old Vaillant wireless thermostat is absolute rubbish so its time to upgrade. I just require a reliable wireless thermostat for a standard Ecotec + 831 combi boiler. I do not need any wireless radiator themostats etc so I assume I just need one zone. I like the idea of having control via an...
  27. A

    Vaillant Turbo Max 837E Hot water issues

    Hi looking for advice please Have Vaillant Turbo Max 837E boiler, the dial temperature set at 42 degree (on 10 clock where as used to be 2oclock if you know what I mean), however when water comes out the tap it continues to go warm, hot, boiling hot, cold, within 10 seconds it can go from 28...
  28. T

    Vaillant diverter valve works but not when hot water cylinder is refilled and tap open...

    Hello, I am not going to make any repairs myself on my boilers but no plumbers have been able to solve my issue. I am seeking for help on this forum to find the cause of the issue I face so that I could communicate to the plumber. I tried on french forums since I am from France but I have not...
  29. gmartine

    Vaillant compatible wireless receivers?

    Anybody else make a non Vaillant facia type receiver 'cept Salus?
  30. R

    Vaillant EcoTEC plus system boiler - DHW control?

    Hi there, Boiler question, but nothing that contravenes gas regs. To get to the point, the Vaillant EcoTEC Plus seems to have two knobs. One has a tap symbol, the other has a radiator symbol. Even the system boiler version of this boiler has two knobs. What I cannot make out is what purpose...
  31. A

    Vaillant Eco Tec Pro24

    Hello We've just moved house which has a Vaillant Eco Tec Pro 24 with a timer unit. There is no room thermostat and I am told you can add a wireless progammeable one. If so is it from Vaillant or another manufacturer and are they straight forward to fit? Thanks for any advice
  32. Atanas Peev

    Gas valve Vaillant eco tec pro 24

    Hello any with experienced with gas valve low voltage The boiler is Vaillant eco tec pro 24 I’ve got a code F61 and voltage to gas valve solenoid is 4.51v dc Regards Atanas
  33. besters

    MagnaCleanse vs Kamco - Which One?

    Hi guys, We live in a 1930's, 3 bed semi and for a few months now, well probably close to a year or so the heating has been only heating the top part of the rads (of which there are 9 in total) and for the most part the bottom sections are cold. That said the towel rails in the bathrooms are...
  34. M

    Vaillant F.22 error help

    Hello, My vaillant is displaying th error code F.22. I did some research and apparently it is necessary to increase the pressure but I don't know how to do it. kind regards
  35. G

    Vaillant VC182e Gerry spec boiler

    Ok.. I got me a Gerry spec Vaillant vc182e boiler that tries to ignight... but she doesnt... It has a room thermostat and no matter what I do.. she wont fire up... To the right of the Temp and presure gagues is a small rocker swich which is known as the "Schörsteinfeger schalter" ( Chimney...
  36. Eric

    Vaillant ecoTEC Exclusive 838 problem

    The boiler temperature is set at 70 degrees but when it fires up for heating it gets to about 45 then shuts down. The flame symbol during heating only shows two bars, out of the four. This is followed by the display of Heating Rem. off time 5 mins. And counts down before firing up again. The...
  37. I

    Problems with Vaillant thermostat

    I posted a while ago about changing batteries in the thing, and was helped here (30 seconds max to avoid losing settings). Since then got another problem. Went away for a week and turned the boiler off, from the thermostat, while away. This was principally because I've had issues with the...
  38. M

    Can't find my filling loop!

    I need to pressurise my Vaillant ecoTEC plus 618 Boiler, but can't find the filling loop! It's not under the boiler itself... (IMG_1696.jpg) And I'm uncertain about the pipes around the water tank upstairs (see pictures attached) -- can you see anything there? Where do you think it could be?
  39. S

    Vaillant pressure dial very high

    hi there just checking if there is anything else i can do before i get a plumber in to attend to my boiler. yesterday i noticed that the pressure gauge on the Vaillant boiler was off the scale, it was past the red (see pic 1). I checked around and was advised to bleed the radiators which I did...
  40. W

    Vaillant Ecotec Pro 28 Anti Cycling and Other Issues

    Hi We recently moved into a refurbished property, don't know how old the boiler is but recently all the radiators were replaced. There is a new remote room thermostat added as well. First problem is when the thermostat says it's not calling for heat, the boiler is constantly firing up and the...
  41. P

    Vaillant Ecotec F28

    Hi guys, I'm a qualified heating engineer having trouble with Ecotec plus 615 2008 model. It's sparking and my u gauge shows a drop in pressure so it appears the gas valves opening but it doesn't light. I've checked the electrodes, door seal, condensate, burner and flue which appear fine. I'm...
  42. B

    Unsure whether to install Atag or Vaillant

    Hi Guys, first post here, looking for advice as to which boiler to go for. I have been recommended either the ATAG i40S or the vaillant 637 boiler. The installer is a recognised fitter for ATAG and highly recommends them as he said that the boiler is very well made and has a 10 year warranty...
  43. J

    Vaillant Boilers, Nest and Opentherm

    Good evening you marvellous lot! So, i have a client that wants the Vaillant pure combi boiler (my go to rear flued boiler), with a Nest controller. As far as I can tell, there is no easy way of making these 2 work easily together. The only way I can find is to use the following thingy...
  44. N

    Vaillant VRT 340f room stat - error message

    Hi all, I have a Vaillant VRT 340f wireless programmable room stat - the early version without the dial. I've just changed the batteries (2xAAA) - something I've done several times before - and now the display just shows 'Err'. I've tried leaving the batteries out for a few minutes and then...
  45. G

    Vaillant Ecotec 630 - Flow Temp

    Ok so am looking for a bit of guidance. Last year I had a Vaillant ECOTEC 630 Plus (System Boiler Version) installed to upgrade an old Keston something or other. According to the manual (and if I am reading it right) I should be able to set a target flow temp for the when the water Cylinder is...
  46. M

    Help! Vaillant boiler not working after changing out a radiator

    Hello guys. Please can you help as at wits end. I've changed out 4 radiators over the last 12 months in my house and the last one being yesterday. I now have a F75 code and a S98 information code on my vaillaint Pro eco tec 28 combi boiler. I had a GSR installer friend come over and he bled...
  47. M

    Vaillant EcoTec Plus boiler whines until hot water is turned on and then stops

    So for a while, our boiler a Vaillant EcoTec Plus has made a whining noise, usually in the morning when it first comes on but can happen any time of the day (when on). The first time it happened I turned on a hot tap and it stopped. I have been doing this ever since, but actually, it is annoying...
  48. A

    Vaillant Ecotec 937+ problem

    Hi all, Hoping someone can help... We have a 937plus about 8 years old. Some weeks ago we noticed radiators were hot but no hot water when demanded. Quick fix was to switch boiler off the back on. Our regular heating guy has diagnosed faulty diverter valve which seems logical to my very...
  49. G

    Vaillant Ecotec plus

    Hello friends! I'm experiencing problems with my Vaillant heating system, I got an f22 error (low water pressure) and I cannot find the filling loop since there are no valves attached to it. I'll appreciate if you could help me out:)
  50. Windy

    Vaillant eco TECH plus 835

    Hi, writing up my last report for my gas portfolio and have come up against something i can't work out whilst doing the gas rate figures!! Data plate shows Hot water pnw 34kw and qnw 34.7kw (hi) manual shows gas rate norm level 3.78m3/h minimum 3.4m3/h maximum 3.97m3/h If i fudge a gas rate...