Air circulating after 40 minutes

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make sure the cold feed is not partly blocked, the air separator system relies on a good supply being available to make up for suction on the air vent. when system is powerflushed, should include the vent and feed by connecting together in the loft, not always done sadly. Having fitted a new pump, the suction might be greater than before. Manufacturer usually tells you minimum head for the pump.
 
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