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What i am trying to say is:- the gravity feed to the domestic water system doesn't work when the pump is running. when pump is off it works fine. Once the pump is activated the gravity feed loses its flow. I can crack and remove the pipes from the cistern with no spillage! The pump is...

Gravity primary, pump secondary(CH) CH on gravity not working. When the CH is on the radiator suck air in when bleeding. CH off gravity works fine. When CH off radiators bleed as normal.