Glow Worm flexicom 30 SX
Our boiler is just over two years old. It often fires up totally normally but sometimes this is preceeded by a loud bang through the flu duct presumably as the gas ignites, although a local boiler engineer thought the bang was before the flame ignited. Is this possible. If it fails to light, then a fault code F1 is displayed. Pressing the reset button clears this and the boiler will then ignite either with or without the loud bang.

Malc, December 2012

Did you get your boiler fixed? My boiler is only 3 weeks old and started doing the same

Jake, November 2014

Flexicom f1 noisy ignition is usually electrode bent , or cracked ( sparks in wrong place and then. Bang. Change electrode.

Oops, December 2012

dust in main burner, needs taking out and washing in soap and water the bang will then be gone

james morris, December 2012