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Hi John,Pump running constantly probably OK.
Combined vent&cold feed as shown.
When refilling the system, open the (empty) header outlet valve first then tie up the ball cock to allow a trickle of water to flow, this helps to allow the air to vent and the water to flow through the same (combined) pipe. I have a isolating gate valve on my system so I can just crack it open to control the water to the ball cock.
Is there a vent plug in the centre of your circ pump?? you might post a picture of your pump showing the model details etc.
Many thanks for your reply!! First of all, attached photos one with red circle shows aerator tucked away.
Yes the pump has a drain plug, see picture and I have bleed it until water comes out. It also has a motorised switch valve to switch HW and CH. I looked up my boiler type and it has an external pump so thats the only one.
I get your slow fill solution where you tie up the ball cock to slow the water inflow, but I have a stop-cock going to the header tank so could I partially open it ( a tiny bit) to achieve the same slow rate? The tank is pretty inaccessible at the peak of the roof. I will try the slow fill idea and come back...
My boiler is on the ground floor, the pump in the attic and it switches itself off so suspect the air pocket is in the boiler loop.
Many Thanks Matt