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