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Converting to a combi but I can’t get the heating to circulate to the rads
New boiler in the same place as old so piped up to the flow and return dropping from the ceiling
I removed the cylinder and piped the flow from the boiler to the flow out to the rads
I capped the cylinder return and stuck an air vent on but it wont circulate
I linked the primary flow and return in the airing cupboard and it circulated back to the boiler
It’s as though the rads are not connected to the return