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vaillant

  1. 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.
  2. R

    Vaillant ecoFIT 415 heat only boiler. Connecting the pump and boiler?

    Vaillant ecoFIT 415 open vent heat only boiler. For wiring the boiler and pump, should I use the 3-way wire switch" solution OR a "remote switching" solution? The pump and copper tank are situated about 25ft from the boiler. I've been told that the 3-way cable solution doesn't work well with...
  3. F

    Vaillant boiler pressure drops only when hot water is on

    Vaillant ecotec boiler loses pressure when hot water is on and does not work. But heating is working fine with normal pressure . Help plz
  4. K

    Vaillant EcoFit Pure 835 Temperature Panel Control

    Hello all, Just moved into a house with a Vaillant EcoFit Pure 835 boiler that is 3-4 years old but the previous owner did not bother to register with Vaillant, so Vaillant says its not under warranty. I've noticed that despite setting the CH to 60 degrees on the boiler's control panel, the...
  5. 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...
  6. 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?
  7. M

    Hi ratio and ppm on a Vaillant eco tec pro 28 lpg (2015)

    hi, I am after some advice, I recently fitted a new gas valve to a vaillant ecotec earlier. the boiler was fitted in 2015 and has been serviced since anyway I put my analyser in the combustion side of the flue and the readings were extremely high, something along the lines of CO ppm —OR—...
  8. 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...
  9. R

    Annual boiler service - any leeway with Vaillant?

    Hello Just a quick question. I had a new Vaillant ecotec plus boiler installed in Nov 2021, with a 10 yr extended warranty. I've been trying to get an engineer in for weeks to do the first service but the earliest appointment is just after Christmas - have I invalidated the warranty? Or is...
  10. F

    Vaillant ecotec+831 - no hot water

    I have a Vaillant ecotec plus 831 (one with small circle buttons) and it has passed gas service not long ago. However, the problem I have is when there is a power cut, once the power has been restored, the boiler says 0c and will not heat water or radiators regardless of what (2 exceptions...
  11. S

    Vaillant Eco Tec Pro 28

    I was going to attempt to install a Tado thermostat in to an Ecotec Pro 28 but as soon as I opened the front cover a black air flow dropped out of it. I’m assuming this should be secured in to place? Also the black heat protection on the front cover is disintegrating. The boiler had its...
  12. V1ks44

    Vaillant boiler always exceeds set temperature.

    Hi sorry to hijack the thread, but im new to these forums and upon searching for some answers to my below question i come across this thread. I have a vaillant 637 system boiler which is located in my loft eaves and has a hot water tank (180L) connected to it which is next to the boiler. The...
  13. J

    Vaillant EcoTEC Pro 28 - radiator flow temp locked to 50 degrees

    Hello all, I’m looking for some advice on my Vaillant boiler, which is controlled by my Hive thermostat. I have set the radiator flow temperature to 75 degrees on the boiler control panel, but the actual temperature never gets hotter than 50. I have done some checks, and believe I have found...
  14. Framing

    Vaillant ecoFIT Sustain boiler query.

    I have a Vaillant ecoFIT Sustain (system?), boiler, with hot water tank. We have hot water and radiators heat fine. My query is that only the radiator symbol on the boiler has been set (70 degrees), the ‘tap‘ symbol says ‘off’. I guess it’s the same temperature for both hot water and to heat...
  15. D

    Vaillant EcoTec Exclusive 365/5-7

    My boiler is in continuos S40 mode. A reset fixes for a while and then it comes back. There are no f codes and the only other possible problem is the diagnostic code 118 reports 8 which is the CO2 sensor . The manual says that this number means Standy Reference resistance not OK . It has been...
  16. J

    Vaillant Ecotec Exclusive Green IQ 835 combi modulation problem

    Hello, We got a Vaillant Ecotec Exclusive Green IQ 835 combi boiler in November 2021 as we wanted the most efficient boiler that modulated really well, especially for heating. Two weeks after the installation, the heating engineer needed to recalibrate the boiler and after that we started...
  17. N

    Vaillant F23 fault, Reading

    I have a Vaillant Ecotec Plus 424 boiler in a closed heating system with 13 rads and 4 towel rails. Rads are steel, pipes are plastic kind of "modern microbore". System water pressure is 1.1 bar. It's a fairly new house, built in 2016. The boiler was last serviced in January 2019. For the last...
  18. G

    Why has Meter reading quadrupled after Gas Check on Vaillant Boiler?

    I recently had a gas safety certificate check done by and my Vaillant Ecotec Pro24 boiler serviced/checked. However a month later and after taking a meter reading it showed that the amount used had nearly quadrupled since the previous month with no change in usage. Hot water is only set at 50...
  19. C

    Vaillant VRT392f fault thermostat controller

    Our VRT 392F wire thermostat control is not working, it lights up and you can change Deutch to English but then you cannot do anything else. Water leaked into our circuit board on our boiler but we have had a new circuit board put in. I looked at the thermostat control, changed the batteries...
  20. B

    Vaillant ectotec Pro Mk1 boiler does not keep temperature

    Vaillant Ecotec Pro MK 1 combined gas heater does not keep temperature when using shower or basin tap. Boiler heats up to 65C, then a few seconds later turns off and temp drops down to 54C. Have tried different temp settings but no joy. Any idea about possible defect/fault? I have short video...

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