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  1. H

    Yet another Vaillant boiler with an F.75 error!

    Also noticed there is a small brown pool of water next to pump! Am I up the Creek cost wise?
  2. H

    Yet another Vaillant boiler with an F.75 error!

    Hey Agile are you still about? Having read the correspondence regarding code f75. Would the sensor still stop the boiler functioning at 3.5 bar? And if I release the pressure to 1.0 would that cure things?
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