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Discuss Bad Crackling in some radiators in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Tigermad

    Tigermad Member

    Plumber fitted an auto bypass a few weeks ago and put some more inhibitor in after I asked him to. Since then the radiators have started crackling really badly when heating up. I have tried bleeding them and it seems to be coming from the side of the radiator without the trv and the valve there and radiator itself. Any ideas? I have an evohome system and unvented system.
     
  2. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Are they new rads ?
     
  3. Tigermad

    Tigermad Member

    Yes. The unvented system was fitted a year ago. Kept the three or 4 existing rads and changed 3 or 4.
     
  4. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Just the new rads that’s noisy or all of them
     
  5. Tigermad

    Tigermad Member

    Hi. Just seems to be downstairs mainly. 2 new rads and one old. The nearest to the boiler is the noisiest
     
  6. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Where did the rads come from ?
    Your unvented system is only hot water , will make no difference to rads
     
  7. Tigermad

    Tigermad Member

    I’ve had the new rads in for over a year. They have only started to crackle since the bypass was fitted a few weeks ago.
     
  8. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Can you put a pic of the bypass, valves and pump.
     
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