central heating

[NeilHewitt]

radiators ticking

[andy hughes]

Probably got air in your system. use a 'bleed' key to release the air, start on the ground floor, and do the bedrooms last. If you haven't got a key, or don't know how to use it, your local hardware store will supply a key, and explain how to bleed a radiator, it's very easy.

[woofgang]

andy is dead right, also run thew system with all the rad valves wide open and get everthing nice and hot first.

[Dsg]

All good advice - but make sure you have shut the system down before bleeding any radiators !