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ecotec

  1. 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...
  2. J

    Boiler pressure on EcoTec keeps rising

    Hi All, I have a problem with my 10 year old EcoTec boiler. The pressure keeps rising to over 3 bar every few days. To get it running again I am releasing about a cupful of water from a radiator to get it below 3 bar. The filling loop is disconnected and I’ve noticed water from the pressure...
  3. 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...
  4. 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)...
  5. 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...
  6. P

    Working gas pressure on Vaillant ecotec 630

    British Gas servicing the above boiler ramped up the boiler to maximum in the installer menu to do flue gas analysis. They also measured the working gas pressure on the gas valve test nipple. This fell to 8mbar on maximum and 17mbar on high setting. They then removed the isolation valve under...
  7. MilkyBadger

    Seeking Engineer for Vaillant EcoTec 832 Boiler Issue - SE London

    Hello, I am looking for a heating engineer to diagnose and resolve an issue with my Vaillant EcoTec 832 combi boiler. Job Location: Copeland Rd, London. Job Description: Problem: The boiler is not providing heating under normal conditions, although hot water supply is fine. Interestingly...
  8. MilkyBadger

    Why Does Vaillant EcoTec 832 Boiler Only Heat in Chimney Sweep Mode?

    Hello everyone, I'm facing an issue with my Vaillant EcoTec 832 boiler and would greatly appreciate your expert advice. The Problem: Heating Not Working Normally. When I turn on the heating, it doesn’t start. However, I still receive hot water, suggesting the boiler does work in some...
  9. N

    Vailant thermostat vrt350 not pairing with ecotec pro 28 boiler

    Hi everyone, I’m writing on behalf of my elderly neighbour and hoping this is a problem someone on this forum has experience of and remedied. The boiler was not responding to the wireless thermostat. The various settings on the thermostat seemed fine and 3 heating times and temperatures were...
  10. Z

    Vailant ecotec Flow Return f23 problem

    Please can anyone let me know if the NTC thermostats are on the correct way around?? I did have problems with the return pipe heating up before the flow so I'm thinking the last plumber may have swapped them around somehow. Havin now reconfigure the central heating i've plumbed in all the...
  11. Z

    38Kw EcoTec 22mm or 28mm F/R?

    I'm moving over to a sealed system on my EcoTec 38kw boiler. The old flow and return were in 28mm which was there long before the Vailant was installed. I'm running 10 rads with a small UFH circuit and unvented cylinder. Could i get away with replacing the 28mm to 22mm instead on the...
  12. McDoosh

    Vaillant EcoTec - 10mm pipework to radiators?

    Hi, just about to bite the bulklet on a new boiler and radiators, Vaillant EcoTec Plus 32kW. Is 10mm pipework to the radiators sufficient? Thanks
  13. Z

    Boiler Pressure Keeps increasing - Vaillant Ecotec Plus 838

    Hello everyone, I have a Vaillant Ecotec Plus 838. The issue i have is after the heating is switched on and then left it to cool over night i see the pressure has gone up. For example yesterday it was set at 1.3 heating was switched on and when it reached its temp it went upto 1.9 so no issues...
  14. D

    Valient Ecotec Pro Droning Noise

    Hi, I wonder if anyone can offer any advice/solutions... I have a boiler, a Valient EcoTec 28 pro, which was fitted a year ago. It makes a droning noise which resonates through the entire house. When it startes you hear this drone, which is loud enough to wake you if it kicks in during the...
  15. P

    Hi all, how to convert to lpg the vaillant ecotec plus 618-2018

    Hi all, how to convert to lpg the vaillant ecotec plus 618-2018
  16. R

    What is ideal pump size for Vaillant ecoTEC Plus15kW Heat Only Boiler?

    What is the ideal pump size for Vaillant ecoTEC Plus 400 15kW Heat Only Boiler? The property is a studio with 1 large room, a small kitchen and a small bathroom. I've been advised to use Grundfos UPS3 15-50/65-130.
  17. F

    URGENT Vaillant Ecotec Pro 24

    Vaillant Ecotec Pro 24. Hi all, we are having issues with hot water as it only stays hot for a few minutes for the taps and shower. You can visibly see the temp on the boiler drop from about 67 for 42 within a few minutes. We removed Mira thermostatic bar and the water remains hot but as soon...
  18. D

    Vaillant ecoTec fault signal

    Does the Vaillant ecoTec have an output that I can connect to an external buzzer to alert me when it’s shut down with a fault?
  19. phil hair

    ecotec pro 24 blackscreen

    ecotec pro 24, the display screen goes blank after about 10-15 seconds and boiler is completely dead. isolate it for a couple of mins and it comes back on and repeats. dont do much on these, so is it the board, or will a dodgy component do this to the board? Im thinking the fan, so pump runs...
  20. VIck982

    Vaillant 630 ecotec + VR71 + Sensohome (wired)

    So I'm looking to have this set up, I have three zones + DHW 2 of those zones are underfloor heating connected to heatmiser uh4 and then there is a radiator zone for upstairs My question is, can hot water priority be set up when there are three seperate 2 way zone valves, one for the...

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