Recent content by Simon Fearn

  1. S

    Bosch=Worcester - Greenstar 29CDI - Humming Noise on Morning Start-up

    The boiler doesn't show any errors and works just fine. It is just a very quick noise first thing in the morning.
  2. S

    Bosch=Worcester - Greenstar 29CDI - Humming Noise on Morning Start-up

    Hi When my boiler fires up first thing in morning (either by drawing hot water or the CH coming on) the boiler makes a humming noise, similar to water knocking or when a valve isn't shutting off fully, for around a second or two then stops and doesn't do it again until the next morning. A...
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