noisy central heating?

Horrible boiler, sounds like 'explosive ignition' - have it checked out by an engineer and make sure he checks the burner and electrodes as Ideal have safety notices with regards to their electrodes on some ICOS/ISAR models.... also have the combustion checked to make sure the gas mixture is ok, could be the spark gap is poor or spark itself.... have it checked

Dave, Corgi eng
February 2009