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  1. E

    Boiler noise

    Boiler is 5 years old and just put 2nd new pcb in 2 days and it still bangs! any thoughts? was all ok before new pcb and fan. :(
  2. E

    Boiler noise

    Yes, sealed box
  3. E

    Boiler noise

    Just had a new pcb and fan on our Vaillant 837e turbomax boiler (non condencing) and now have a clunk from boiler when turning the hot water on, when the boiler is in heating mode. Any ideas?
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