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Viessmann 222F banging

Discussion in 'Plumbing and Central Heating' started by Holgs, 21 Jan 2020.

  1. Holgs

    Holgs

    Joined:
    21 Jan 2020
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    Country:
    United Kingdom
    Hello

    I have had a new 222F with WC installed about 9 month ago and only recently noticed a banging. I seems that when the burner fires up all is ok and modulation (according to the VI app) is going from 60% to 9%. Once the burner turns off I can hear 3 banging noises in the pipework, bang followed by a bang bang noise. The system is operating ok but the noise wakes is up from time to time. I know the system only started doing this a month or so ago which is weird. Anyone seen such phenomenon before?

    thanks upfront for any advice.
     
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