Boiler burping noise

[Decimal50]

Hi all, 

I own a new built which got shipped with a Logic Combi ESP1 35, this has been fine for the first 6-8 Months, then started to make a bizarre noise when igniting.

The logic engineer came about and said it was an Ignition Explosion, due to too much gas supplied by the governor next the Gas meeter outside. The gas governor has been replaced by a brand new one and fitted, howevet the weird noise started to occur again and wonder if one day it will just blow up! Here are couple of videos that show the ignition fart once the hot water is activated at the tap:

 

 

 

https://vimeo.com/1020749731

 

Would you have any more opinion or ideas on this? Water pressure is 1.5 bar when idle and radiators have been bleed everywhere.

Thanks 

P