my glow worm fuel saver mk 11, when i put on my boiler, it makes a banging noise, it fires up, and then cuts out. Have fitted a new pump, new cylinder due 2 a high volume of limescale. Any 1 know wot could cause this and how 2 fix it or do i need a new boiler?

gary, August 2008

sounds like scale in the heat exchanger. you can try to add a descaler but remember to follow directions. generally over the counter descalers are not man enough for the job , but other descalers need neutralizing after use as they are quite strong. another couple of outside possbilities , too high burner pressure , airlock on system but if you have a scale problem already its likely to be that

kieran, August 2008