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vaillant

  1. E

    Megaflo / Vaillant / Nest not producing hot water - help!

    We have moved into a house which has a system involving a Vaillant boiler, indirect Megaflo and Nest. The Megaflo has been producing the hot water since we moved in (which we didn't realise) but the fuse blew the other day. We've now replaced the fuse. The boiler engineer was able to 'boost' the...
  2. A

    Vaillant EcoTec pro 28 - Slow CH start up

    Hello all, Im wondering if you can help? Ive got a Vaillant Ecotech Pro 28 which was installed 9 years back and has worked like a dream all its life, however this Autumn I've unfortunately started to face issues with it. I've noticed that its taking 10-15 mins for the CH to kick in when...
  3. S

    Vaillant Turbomax ignition issue - but only in the evening

    My ancient Vaillant Turbomax has been operating perfectly for the last few years but this week on Monday night I had no hot water or heating. I switched the boiler off and back on and all was fine again. The system is on a Honeywell system which switches the heating on in the morning for half...
  4. M

    Vaillant EcoFIT pure leaking water from behind condensation trap

    I have a Vaillant ecoFit pure 830 which developed the f.22 fault, the pressure had dropped to 0.2 bar, i refilled the system and away it went, i noticed yesterday that there was water on the floor below the boiler and noticed that water was leaking from a small hole located behind the...
  5. S

    How to Repressurise Vaillant Boiler?

    I returned from a weekend away and noticed that the boiler was flashing “0,8 bar”. I put the heating on and the the “0.8 bar” message has since disappeared but the water level is right on the edge, so it needs topping up. I’ve looked underneath and below the boiler but I’m still not sure how...
  6. asoffe

    Vaillant VR33 (with Nest) and VR66

    Does anyone have experience of using a VR33 (for Heating OpenTherm control with Nest) and a VR66 for Hot Water Priority with Vaillant system boilers? I'm specifically using an EcoTec plus 624 I've got a system working with a Nest and VR66 to provide hot water priority and it works well with...
  7. Peter Mago

    How to add water to system- Vaillant Ecotec Pro

    How do I let water into the system? Tap is connected to water tank and there is a black inlet connected to the water tank? Thanks for any answers
  8. V

    Vaillant Ecotec plus 428 No heating

    Hi We've got a Vaillant ecotec plus 428 that doesn't seem to want to supply any heat to the radiators despite the hot water working just fine. Of some importance (I think) is that there is no radiator symbol displayed on the boiler screen, only a tap. We have a wireless thermostat (Altech...
  9. P

    Vaillant Ecotec plus 428 overactive. Keeps running in S7 and S8 mode.

    I have an open vented central heating system with a hot water tank. Both heating and hot water circuits have a motorised valve controlled by a timer. The timer for the central heating is always in the “on” position and is governed by a room thermostat. The boiler is a Vaillant Ecotec Plus 428...
  10. A

    Vaillant 242 EH ignition issues

    Hello My trusty Vaillant 242 EH is having some issues. It has developed an issue when firing up the burner. The fault is seen with the hot water and central heating. When it operates it takes anything from one to several attempts to light and when it takes too many the lockout circuit is...
  11. N

    Hot water on constantly vaillant ecotech 30 combi boiler

    I notice last night my boiler cupboard was really hot from the hot water pipe, but my husband had just had a shower. This morning it was still hot when we first got up and we noticed the tap symbol was flashing. This is supposed to flash when using the hot water. We've tried turning off...
    • Nuts&Bolts
    • Thread
    • boiler combi combi boiler hot water vaillant water
    • Replies: 1
    • Forum: Boiler Advice Forum
  12. B

    Independent advice on Vaillant boilers

    We are charity with two large properties providing flats for elderly person's living independently. In the past year,we have had to replace the heating boiler in each property. This was done by British Gas who supplied and installed Vaillant boilers. We are considering making a complaint...
  13. N

    Vaillant Atmotec exclusiv - no pressure

    Hi, I'm in an Airbnb in Austria and the boiler has lost pressure. YouTube seems to suggest it's an easy fix....but I can't find the valves that are used in the videos. Any clues from the photo?!
  14. S

    Vaillant boiler start up question……..

    Hi, I have a Vaillant Ecotec Plus 637 condensing boiler and its working okay, serviced about a year ago. Just something I noticed the other day, when the central heating program or hot water program (it heats an unvented cylinder twice a day) come on there is a 3 minute or so delay for the hot...
  15. M

    How to repressurize Vaillant boiler

    Hi there, I recently moved into a new place, and I'm having difficulty finding the valves to repressurize the Vaillant boiler. I would be extremely grateful if someone could help me out! Quick video: And below are some images: Thank you!
  16. J

    Vaillant system set-up help

    Hello, I’m hoping someone can help as I’m getting differing advice every time I speak to Vaillant; We are refurbishing a property and installing a Vaillant Ecotec Plus 630 system boiler with a Megaflo cylinder. We are creating 4-zones: Downstairs rads Upstairs rads Bathroom underfloor heating...
  17. D

    Repressurise Vaillant boiler - no valves

    HI I would like to repressurise our Vaillant EcoFit Pure 625. Normally a job even an ignoramus like me can do. However we have no filler pipe and no valves. Could these be inside the case?
  18. K

    Vaillant ecoTec Sustain and an Automatic Bypass

    Hello all I hope you are well. This is my first Post here so..... I recently had a Vaillant ecoTec Sustain (Combi) installed under the ECO Grant Scheme to replace a 14 Year Old Ideal ISAR HE24. When the Ideal was installed in 2008 for my Mum there was also an Automatic Bypass (ABBV1) fitted...
  19. K

    Vaillant boiler always exceeds set temperature

    Hello. I have a Vaillant EcoFit boiler that is a few years old. We had our annual service last month and ever since then I’ve noticed something unusual. The radiator mode temperature is set to 65C but it always exceeds that, hits 70C, and then stops and the the egg timer comes on. If I check...
  20. J

    Vaillant 637 with pressure issues

    Hi there, I've recently started having pressure problems with my Vaillant Ecotec Pro 637 System boiler. When the system has been off for a while (and the water in the system has cooled) the pressure is often really low (certainly less than the min 1bar for the boiler to fire and often...

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