sounds like vitiation is taking place on the burner assembley , this is s result of combustion products leaving the boiler within the flue outlet duct returning within the air intake duct and reentering the combustion chamber causing a reduced oxygen level for new combustion resulting in the flames lifting off the burner as they search for oxygen to stabilise . this re entry of combustion product takes place when a flue joining bracket within the outlet flue duct corrodes and separates allowing the products of combustion to leak into the surrounding air duct . You will need a gas safe engineer to carry out this repair as a flue analyser will be reqd to check for correct combustion all innaccordance with the manufacturers instructions. hope this helps ( boiler medics )
Went to run the bath for the kids this evening after the heating had been on for a bit and although the hot was was fine, the boiler started to really bang and rattle.
All sorted @AGAS have seen that problem a few times with that boiler so easy to get it wrong mate, have done it myself, typicall quality Ferroli shoite
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