Potterton Suprima 100 Regular Problem Jet takeoff noises?

If boiler is making a banging noise known as "explosive ignition!" this is due to hairline crack in the burner lower manifold tube or tube is loose allowing escape of gas within the boiler chamber that ignites with a delay & combust very loudly. This part is expensive. Circa £145 + vat. The part can be repaired by using Holts "Firegum" (plyable joint sealer paste) that rub over joint & can withstand temperatures of 1200 C & with heat bond becomes stronger.

Tarquin
February 2012

check the pump, if you've had problems with sludge then you may have some debris lodged in the impellars.

Ian
March 2010