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viessmann

The Viessmann Group is a German manufacturer of heating, industrial, and refrigeration systems headquartered in Allendorf (Eder), Germany. With 23 production companies in 12 countries, distribution companies and representative offices in 74 countries and 120 sales offices throughout the world, Viessmann is international in its orientation. 55 percent of turnover is generated abroad. Since January 2018, the company is led by Martin Vießmann (Chairman of the Executive Board), Maximilian Viessmann (Co-CEO) and Joachim Janssen (Co-CEO).The company was founded in Hof an der Saale in 1917 by Johann Viessmann, and has been family owned for four generations. As of 2019, the company employs 12,300 people and reports annual sales of € 2.65 billion.

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  1. G

    Viessmann Vitodens 200-W - no warranty??

    We have recently had a Viessmann Vitodens 200-W boiler fitted, and let me start out by saying that it is a superb piece of engineering... apart from bleeding a few radiators and tweaking the settings, no issues whatsoever. Except...! I received an e-mail from Viessmann, asking me if we wanted...
  2. eagleeye

    Viessmann min gas working pressure

    Can anybody tell me what the minimum gas working pressure is on the Viessmann 100-W 35kW combi. Going by what it says in the MI's it can be between 10-34mb. Or am I reading this wrong ? See attached from MI's.
  3. M

    Viessmann 200 60kW E3

    Hi, I am having an issue with a Viessmann Vitodens 200 installed for a client. The boiler is a B2HA 60kW commercial with Combustion controller lockout fault E3. It is weather compensated, system Type 4 the mixer is a 1 1/4” Divicon I have spoken to Viessmann who suggested the Divicon was...
  4. eagleeye

    Viessmann boiler issues

    Been fitting Viessmann Boilers for a while now and just recently had a few that have either been damaged or have missing parts when they are unpacked. Had one today that has the condense trap plug missing and the when trap is all moving about. Really bad for what is meant to be a quality boiler...
  5. eagleeye

    Viessmann C code after install and commissioning

    Installed a Viessmann combi on Friday and couldn't get heating working. Hot water fine but not heating. Had a letter C on the display. Reset it and it went through startup and then went to C again. Called Viessmann technical and even they didn't know what it was. Has anyone else had this and if...
  6. L

    Viessmann vitodens 100 FF fault?

    Hi. I've been out to look at this boiler today (I am a gas engineer) and found that this FF fault code keeps coming up even after restarting the boiler. On arrival I found pressure was on zero so I topped it back up and reset the boiler. On the display it says 141 then changes to...
    • lupieloo
    • Thread
    • america fault usa viessmann vitodens
    • Replies: 2
    • Forum: USA
  7. A

    Viessmann Boiler Left in Service Mode now not working

    Hi boiler in question is a Viessmann 100-W WB1B Heat Only Boiler with F&E Tank in loft etc and Cylinder appreciate some advice please Not sure if connected but Engineer just been and serviced boiler etc 1 day ago and, by mistake he seems to have left it in Service Mode so when the hot water was...
  8. A

    Viessmann 100 WB1B-26 F4 fault on warm days

    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 (Philadelphia, PA USA). The problem goes like this. From midnight to 10 AM, the boiler works fine. But when...
  9. V

    Viessmann boiler short cycling

    Hi, I have noticed my boiler Viessmann Vitodens 100-W(B1HC-26) makes a series of short cycling before starting to heat. Boiler is controlled by Baxi uSense room thermostat connected via Opentherm. I installed some monitoring equipment to get the better understanding of the problem. Bellow is...
  10. mars_man

    Viessmann boiler question

    Wondering if there are plumbing gurus here who can suggest what could be the issue .Recently changed to gas heating and have a viessmann vitoden 100 , 26 kw condensing boiler .The old oil boiler was a firebird 26 Kw and I have almost already started missing it . The house is well insulated and...
    • mars_man
    • Thread
    • boiler boiler installation central heating system plumber question viessmann
    • Replies: 41
    • Forum: Central Heating Forum
  11. A

    Switched live on Viessmann vitodens 100 boiler

    Hi all, I have installed Viessmann vitodense 100 combi boiler and about to connect to my wiring center, I could not find to which connector/port on the boiler should I wire switch live. Has anyone experience with this?
    • Artin
    • Thread
    • america boiler live switched switched live usa viessmann vitodens
    • Replies: 9
    • Forum: USA
  12. N

    How to connect honeywell t5+ to viesmann vitodens 100 boiler.

    I have viessmann vitodens wb1b 100 boiler and im trying to install a honeywell t5+ wifi thermostat. I currently have a 2 wire thermostat with no c-wire. Can anyone help me with directions and or pictures?
    • Nstivefree
    • Thread
    • america boiler connect currently honeywell install thermostat trying usa viessmann vitodens
    • Replies: 0
    • Forum: USA
  13. B

    Connect Viessmann boiler to honeywell smartfit

    Hello guys Just installed a Viessmann Vitodens 100w and am struggling with the wiring (honeywell smartfit controller). Viessmann say you can just connect the mains power to the boiler, which I've done, and it works. However, there is no pump overrun this way. As soon as demand goes off, the...
    • BigTHoldstock
    • Thread
    • america boiler connect honeywell usa viessmann
    • Replies: 2
    • Forum: USA
  14. S

    Viessmann 200-W Combi 35kw (New 2019 version) Installed - Advice?

    Evening All, Hoping some plumbing/heating engineers/other knowledgable folk on here might be able to assist with some questions about my new boiler. We had the new Viessmann 200-W 35kw Combi installed this week by a Viessmann registered local heating engineer. It's the new 2019 version with...
    • StumblingTrout
    • Thread
    • 200-w advice america combi installed usa version viessmann
    • Replies: 12
    • Forum: USA
  15. A

    Looking for a Gas Safe engineer to install a Viessmann Boiler SE London

    Hi, i’m looking to upgrade my heating system; i currently have an unvented system with a Potterton Boiler, cylinder in the airing cupboard (1st floor). what i want to do is change the boiler to a Viessmann in a new position - cupboard at the front of the property - see pics. Also i want the...
  16. C

    Viessmann Vitodens 200-W Problems

    I have two Vitodens 200-W system boilers connected via a low loss header. They are about 7 years old and have run perfectly since they were first installed until now. They were installed as part of a whole house re-plumb and have had Fernox MB-1 Heating Protector in the circuit since day one...
  17. J

    Viessmann Pressure gaining

    Hi, new to this forum. Wondering if anyone can shed any light. I have a Viessmann Vitodens 100-W WB1B 30kW Combi Boiler and it's been installed around 10 years so I know it's gradually on it's way out. I have had no real issues apart from having to have a new pressure vessel fitted 3 years...
  18. P

    Viessmann multiple zones

    I know that through opentherm thermostats it is possible to control Vitodense 100-w DHW. But in case you use a simple thermostat there is no way to turn it off remotely. In case of having multiple zones I can't find a way to control dhw since only one opentherm thermostat can be connected. Is...
    • parhs
    • Thread
    • forum multiple plumbing viessmann zone zones
    • Replies: 2
    • Forum: Plumbing Zone
  19. F

    Viessmann Vitodens. Hot weather, no hot water

    We had this problem for a few days last year, but has appeared again. During these warmer temperatures that we are currently experiencing our boiler stops heating the hot water. Upto a couple of days ago when it was cooler it was working fine, and if as last year as soon as it cools off again...
  20. G

    Viessmann 111W storage combi "Crinkly/corroding hoses" Your advise/experience

    Hi I'm new on this forum so my apology if this is not the correct etiquette. Earlier I thought I was posting this question on a forum but think I actually "started a conversation" with Scott) I am looking for advice on Viessman 111W corroding hoses. Background: I currently have a 19 year old...
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