Its all a bit Baxilly you probably i guess do not have the a.a.v pipe that you connect to your a.a.v and heat x i have had a look on Parts arena but i can not find the part number i am sure another will post the P.N but if not call Baxi tec
Just below that grommet there is a blanking plug fitted to the heat x secured by a "d clip".Make sure when you remove it that the o ring comes out with it if you dont you will struggle like ~~## to get the a.a.v pipe in.
Jerk ?
What is the condition of the heat x insulation ?
What are the combustion readings ?
What is its gas rate ?
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