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  1. J

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

    No. Flow is going, but then tapped on gas supply valve and is now working but that gas supply valve is obviously about to go.
  2. J

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

    Ok a new piece of data. When it cycles, it is actually heating up for a few seconds so that means it is actually igniting, but then it shuts down. The internal temperature rises from 75F to 85F then drops back down. Any clue to what the problem is?
  3. J

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

    I just spoke on the phone with Viessmann's Tech service and he thinks because it is continuously cycling and there is no error message, it is not the pressure switch or ignitor he says it is probably the internal gas valve. Does this sound right?
  4. J

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

    My 2007 Viessmann Vitodens 100-W30 gas boiler 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...
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