Seems my post got deleted regards burner box gasket causing said issues , something the RGI will surely check.
Burner assembly is fixed @ front @ back with no fixing to sides , due to the pretty thin material used they tend to distort , howling noise is usually only heard when boiler fires from cold , once warmed burner hood/assembly expands & howling goes away.................FGA confirmed this & appliance was labeled ID.
What was the reason above post was deleted? (posted again) , if contrary to the rules on here then i won't post similar issues , considering time & effort are for free...........................please advise?
Wouldn't say it was advice but more so what the problem could be , the OP already mentioned hole in flue , doesn't mean to say OP will start removing flue assembly , anyone can download service/maintenance instructions from internet...........................seems to be a very fine line between diagnosis & advising the OP how it's done.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local