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I don't know if its definitely the cold fill (goes upstairs, laminate floor) could it be something else ?. Return has manual air vent flow hasn't, even though the flow is higher. I could split the bollofix and see if it drains, if it does should i take out the bollofix ?

My sister has a myson apollo boiler, the flow to the pump comes off the top and a 15mm pipe joins it (15mm got a bollafix valve) then it goes under the floor about 10ft to the pump. My question is; if the 15mm pipe is the cold fill i thought the vent should be next to it or am i wrong. Its a Y plan.