Hi, what issue are you having with it?
Hi, check the fitter the flue restictor ring. Required for short flue run. Easily missed.
If he did(it sits on top of the boiler flue outlet.
If he did check f!he for blockages
It could be.. i th9nk it most likely the issue, just check no wiring is getting snagged when putting on the cover .
Glad you got it sorted. All 6he best