Boiler was in house, new, when i moved in christmas 2004. Started this year got worse. I checked condensate trap, as i say then flushed and filled the trap. But banging started soon after again.
Worth calling NG/transco to check the regulator on the gas meter, it might be locking up, this can cause explosive ignition. The other possible fault will require an RGi, the flue joints in particular the vertical adaptor on top have become dislodged, usually come across this on new (badly installed) boilers.
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