Why is my combination boiler constantly clicking?

[techfix01]

Hi i have a Vaillant Eco Tech Plus 381 combination boiler and only had it for a week and it has been making this clicking noise when the central heating is on. It can be fairly loud at times. Is this normal as i`ve never heard this before. Is it possible to stop this. Thanks

 

[BLOD]

If its only a week old I'd call the installer back.

 

[armourer]

Have the gas rate and burner pressures checked. It could be overheating..............then again could just be expansion on pipework against wooden joists?

 

[REDSAW]

or a glob of solder in the pipe.