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    (unspecified) boiler bangs at start up

    Any other suggestions please?
  2. A

    (unspecified) boiler bangs at start up

    Many thanks for your answer. Pump checked and running OK. Is the pump really likely to be at fault? The system runs OK after a few mins. Plus it's fine on warm/hot starts. The noises only ever happen when everything is cold. Thanks again.
  3. A

    (unspecified) boiler bangs at start up

    Anyone please?
  4. A

    (unspecified) boiler bangs at start up

    OK, here goes then. 20yr old Gloworm fuelsaver, Open vented system, Myson aerjec air seperator, F&E tank in loft, 10 single rads with TRVs on 8mm microbore. Grundfoss variable pump, Danfoss programmable roomstat, Horstman CH/HW control. HW cylinder below boiler. The noises only...
  5. A

    (unspecified) boiler bangs at start up

    Can anyone help with a serious answer please?
  6. A

    (unspecified) boiler bangs at start up

    Well, that's where they belong! Any ideas to get rid of mine?
  7. A

    (unspecified) boiler bangs at start up

    Hello all, A few minutes after a cold start my CH system makes noises like a wounded donkey trying to kick it's way out of the boiler cupboard. This only lasts 3-4 minutes and then the system operates fine until the next cold start. The noise centres around the air seperator about 12" from the...
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