when the central heating comes on there is a loud bang. its sometimes the second or third time the central heating comes on, its really loud and frightening i have bled the radiators and they seem ok. my boiler is an ideal icos and only 3 years old. how can i resolve this issue.

Peter, February 2009

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