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  1. A

    Central heating -whistling noise

    it was serviced back in Sept/Oct.
  2. A

    Glow worm ultra com 18hxi whistling noise

    I am experiencing the exact same problem with this boiler.Any advice on resolution?
  3. A

    Central heating -whistling noise

    My central heating system whistles when it first comes on (happens only in heating mode not whilst heating water only) for a period of 10-15 minutes and then it is ok.My boiler is a Glowworm ultracom 18hxi.The engineer from Glowworm diagnosed this as being due to chemicals having been left in...
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