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  1. R

    How do I stop Air being sucked into pump of Vaillant heat only boiler?

    Vaillant ecoTEC Plus 400 15kW Heat Only Boiler I've got air in the pump and one gas engineer has said I need to move the pipes as they are configured incorrectly. Another said all I need to do is add an AAV as high as possible. Another said I should seal the system. Boiler was installed in...
    • raidac
    • Thread
    • boiler heat pump vaillant
    • Replies: 9
    • Forum: Boilers
  2. B

    Vaillant TURBOMax Plus 828E - Partial Load Setting d.00 problems

    Hi, I have a TURBOMax Plus 828E in a small Annex that only has 3 Rads. The boiler Cycles but is only ignited for about 30-40 seconds before reaching target Temp and then goes on pump overrun. Given that there are only 3 Rads and are 'designer' with a total combined KW spec of about 2.5kw, the...
  3. 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
  4. R

    Installing a new pump for Vaillant ecoTEC Plus 400 15kW. West London

    Removing pump and installing a new pump for Vaillant ecoTEC Plus 400 15kW Heat Only Boiler. Connecting the pump to the boiler and completing all wiring for the thermostat and consumer heating controller.
  5. 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.
    • raidac
    • Thread
    • boiler ecotec heat ideal pump size vaillant
    • Replies: 1
    • Forum: Boilers
  6. 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...
    • raidac
    • Thread
    • boiler heat pump vaillant
    • Replies: 6
    • Forum: Boilers
  7. 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
    • Freak1234
    • Thread
    • boiler hot water pressure vaillant water
    • Replies: 1
    • Forum: Boilers
  8. 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...
  9. 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...
  10. 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?
  11. D

    Vaillant SensoCOMFORT help!

    Hi, I recently had the Vaillant weather comp VRC720f and VR71 fitted to my hot water tank, radiator circuit and UFH downstairs (run via heatmiser). My aim is to run the boiler on modulation at a low temperature. I've figured out I can heat the home well on a minus temp day at a flow temp of 45...
  12. 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—...
  13. 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...
  14. 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...
    • RS_2023
    • Thread
    • boiler service vaillant
    • Replies: 1
    • Forum: Boilers
  15. 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...
  16. 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...
  17. 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...
    • V1ks44
    • Thread
    • boiler vaillant
    • Replies: 11
    • Forum: Boilers
  18. 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...
  19. 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...
    • Framing
    • Thread
    • boiler vaillant
    • Replies: 7
    • Forum: Boilers
  20. 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...
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