when my central heatimg system fires up it bangs. it doesnt always do it on the first fire up, it could be the second or third time of asking. its so loud its frightening. my ideal icos boiler is only 3 years old. i bled the rads they seem ok

peter, February 2009

this could be many things
1. pump could be sticking on firing up
2. system not been flushed out installation of appliance
3. system design
4. blockages in pipe work

liam, February 2009