1. k00ba83

    Viessmann vitodens 0-50w, Google Nest & Opentherm problem

    Hi. I'm new here. I've purchased Google Nest 3rd Generation learning thermostat and engineer came yesterday to install it. Live + neutral from Heatlink connected to boilers live & neutral, then OT1 and OT2 connected to the block on top of the electric board (pin 3 & 4) (see image- not mine, but...
  2. T

    Boiler kettling, is it the heating pump?

    Hi all! I had a new Viessmann boiler installed in February this year, they preformed a full power flush etc according to the manufacturers instillation specification and the I staller was manufacturer approved. We've recently been using the boiler and it's making a whiring noise (kind of...
  3. A

    Viessmann vitodens 50 hot water issue

    Hi. I have a viesmanm vitodens 50 but I've noticed it's behavior change recently I think. When running a bath for example, the boiler will fire up and start providing hot water as expected. The temp on the boiler display climbs steadily to about 85 degrees with the burner indicator showing 5...
  4. bindy

    Hot water going cold

    We have had a Viessmann Vitodens 050-w boiler since 2016 and in the last few weeks the hot water keeps running cold, so only geting a 1/4 of a bath before it goes cold again. We don't need to add cold water which is unsual as it's normally red hot. Any suggestions what could be wrong please. My...
  5. N

    Viessmann 111 or 222

    Hi, Can anyone suggest which boiler is better Viessmann 111 or 222 - 32kw? Its semi detached house with 130sqm. I need to cover 90sqm ufh, 6 radiators, 3 baths and a kitchen sink.
  6. F

    Boiler pump running when no heat being called for

    I'm finding that occasionally the boiler pump will be running when no radiator is calling for heat (and the boiler is outputting none). I havent really timed it, but its just for a few minutes I think. Its not directly after heat has been called, but seemingly at random. Do some boilers run it...
  7. F

    Which operating mode for Viessmann 100-W?

    I'm about to get a Viessmann 100-W B1KF and plan to have it hooked up to a Tado smart thermostat system. I'm assuming that as the Tado supports OpenTherm, to get that benefit, I should ask the installers to make sure it is in the operation mode highlighted below (from the 4 available)? I've...
  8. N

    Viessmann vitodens 050-W valves

    Hello, I stupidly was fiddling with the isolation valves in my viessmann vitodens 050-W boiler and forgot which direction they go in, I have all valves open currently, the hot and cold water, flow in and flow out valves also. Is this correct?
  9. J

    Replacement boiler - keep traditional or change to combi?

    Hi Our 30-odd year old Potterton Netaheat boiler has stopped working (fan works but it's not firing). I've decided not to bother throwing good money after bad and paying someone to come and look at it having cancelled British Gas Homecare some years ago. I've done some research and it seems...
  10. S

    Viessmann Central Heating Wiring

    Hi Folks, Looking for a bit of help here. We moved into our current house in 2018 and have always had a bit of an issue with the heating. The boiler is a Viessmann 200-W WB2B system boiler, and the central heating is split into the zones, each controlled by a thermostat. The boiler is plumbed...
  11. R

    Viessmann 100, F4 fault on warm days (in USA)

    I have a problem with my Viessmann Vitodens 100 WB1B-26 boiler. It has had this problem since it was installed (Dec 2012), but is worse this year due to the very warm winter in my area. The problem goes like this. From midnight to 10 AM, the boiler works fine. But when the outside...
  12. J

    Viessmann weather comp sensor help needed please

    hi all, I have had a viessmann vitodens-100 w 26kw boiler fitted ( type b1hc, b1kc ) serial 7570672 i have picked up a weather comp sensor off fleebay for £15 and want to install it ( V200 outdoor sensor part 7427232 it also has a sticker on the unit that says ntc 10k ) the chap says it will...
  13. B

    Viessmann 100 WB1B 35kW error code fd

    Hi In case it helps anyone else, I just wanted to post about an unusual issue I had with error code fd showing on my Viessmann Vitodens 100 WB1B 35kW system boiler. After much head scratching it turned out the problem was that our mains voltage was too high (257V at the time) and the boiler...
  14. C

    Viessmann Vitodens 100-W Combi Boiler B1KC

    Hello all! I've just got a new Combi boiler installed and would like to clarify two things (I have heating off atm and DHW set to 50ºC (which is default). - While using hot tap water, display shows it goes to around 64ºC. Shouldn't it be around 50 as per setting? - In DHW, does it matter if...
  15. B

    Viessmann 200w with Multi Zones

    Merry xmas all I am replacing my creaking ideal mexico with a viessmann 200w 35kw 4 piped. Converting both CH and HW from vented to unvented. I currently have each room zoned off (radiator actuators) via a central controller (Loxone). 6 bedrooms, 3 bathrooms, kitchen and 3 reception rooms etc...
  16. P

    Viessmann Vitodens 200 WB2B

    Generally there is a problem with the boiler cutting out after only a few minutes of supplying DHW to taps or showers and not restarting once the cold water supply brings to boiler temperature down to 50oC or lower . Specifically, is there a "right way up" to install a new Plate Heat Exchanger...
  17. J

    Boiler Temp Very Low - No Heating Or Hot Water

    I'm completely unexperienced with all of this, but am hoping for some help here before I have to call someone out.. I have a Viessmann Vitodens 100-W WB1B boiler (pictured) which, as of last night, has dropped to a temperature of between 11 and 13 degrees, leaving me without heating or hot...
  18. M

    Viessmann boiler & Hive

    IMG_6873 by Martin Biggs posted 29 Oct 2016 at 7:58 PM I have a Viessmann Vitodens 100 boiler with a wireless receiver and would like to use Hive to control my heating. Is it possible the existing receiver maybe compatible with Hive or will I definitely need to install the Hive receiver? If so...
  19. Goo2088

    Viessmann vitodens 100 W

    Hi We recently bought a house with a 5 year old viessmann vitodens gas boiler. We have never really got to grips with it... the manual timer doesn't seem to work and we have to manually turn the heating/hot water on and off using the dials. Last winter we had the hot water set at the factory...
  20. S

    Viessmann 100W fault Code: F1 and now F2

    The central heating has been off for a couple of months now. I turned all the upstairs radiators off and drained the system the other week as I was removing the radiators downstairs, ready to decorate/ install new ones, the hot water has been working fine ever since with no problems. Today I...