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Vitodens 100-W Cycles But Won't Ingite, No Error Message

Jake48Jake48 Posts: 28Member
My 2007 Viessmann Vitodens 100-W30 cycles continuously but won't ignite. There is no error message. This is the first time I have had a problem with this unit in which there was no Fault Code (error message).



In past I had stuck flapper in 2010 but got F-5 fault.



In 2011 I had low pressure from bad feed reg valve but got Low pressure fault.



The pressure is fine this time.



Is it a stuck flapper again? Is so, why no error message?



Anyone know what might be wrong?
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Comments

  • ChrisChris Posts: 2,869Member
    Flow Switch

    Generally you would not see an error code if you're not making the flow switch or the boiler is air bound.
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
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  • Jake48Jake48 Posts: 28Member
    Flow Switch

    Can you elaborate, I don't know what you mean?



    I just got off the phone with Viessmann tech service and they think it is the gas valve.
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  • ChrisChris Posts: 2,869Member
    There's A

    Flow switch in the boiler. If you don't make the flow switch the boiler will just sit there and do what it's doing. No flow no go. That would be the 1st thing I check. Here's the service and install manual..



    http://www.viessmann-us.com/content/dam/internet-ca/pdfs/doc/wb1/vitodens_100_is.pdf
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
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  • Jake48Jake48 Posts: 28Member
    No Flow Switch

    There is no part in the manual called "flow switch"
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  • ChrisChris Posts: 2,869Member
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
    · ·
  • Jake48Jake48 Posts: 28Member
    New Clue

    Ok Chris found the pressure switch and when I cycled on felt water flowing through so not that. However, I realized when it cycles, it is actually heating up raising the unit temp from 75 to 82 then shuts off. So that means it is actually firing and lighting, correct?



    So why does it keep shutting down?
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  • ChrisChris Posts: 2,869Member
    edited July 2014
    Suggest

    You call a professional. Didn't say pressure switch, said flow switch
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
    · ·
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