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vaillant

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. C

    Vaillant VRC430 in lounge using VR81 as thermostat

    I have a vrc430 which is mounted in one room, near the boiler, but I want my vr81 to be the thermostat that controls the room temperature, and not the thermostat in the vrc430. How do I achieve that ? What setting should I set on the vrc430 between thermostat, modulation, or off .? thanks
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. A

    Vaillant Ecotec Plus Combi & UFH Control - V Smart Possible?

    Hi All Looking at having controls replaced / upgraded for a Vaillant Ecotect plus combi boiler. Currently have x2 zone valves on the heating (x1 for rads via a Honeywell wireless stat, and x1 for UFH circuits via Heatmiser stats - both wired to a Heatmiser wiring centre) I'm interested in...
  16. 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
  17. 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...
  18. 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...
  19. 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...
  20. 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

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