We've recently moved house. Whenever the CH is on, there is a constant
clicking/popping noise coming from the pipes (akin to the 'expansion'
sounds you sometimes get when a system first fires up). This carries
on all the time the heating is on, with clicks/pops every couple of
seconds. These noises seem to come only from the upstairs pipes.

The system is gas fired, with the combi boiler being about 6 years
old. The radiators (and presumably pipework) are probably about 30
years old. The only exception is one small radiator that is probably 6
years old. The previous owners had the boiler serviced annually.

So, does anybody have an idea what might be cuasing the noise? And,
more importnatly, how can we fix it?

Thanks

Dave

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