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Excessive air in pressurised system

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Looking for some advice about my pressurised CH. Had an extra zone added on for UFH and needed to have a 3 port valve replaced by a 2 port valve to prevent the rads being turned on when the UFH called for heat.

When the plumbers changed the pumps over they also installed a bypass to prevent boiler overheat (which made sense to me). Since then (and not saying it has been any fault of the plumbers who carried out the work) 2 towel radiators have been constantly filling with a substantial amount of air and need bleeding once a day at least.

I am also getting a very strange noise that is pretty disturbing as it happens early in the morning and sometimes late at night. It sounds like a fog horn and i have tried to reproduce the situation to produce the noise but have been unsuccessful.

Any advice to help with the noise and the stop the constant air ingress.

Thanks
 
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