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If I put the pump on max then the noise starts up within a few seconds and is extremely noisy. If I then turn the pump down to minimum the noise then eases before finally stopping. After about 10 minutes, with the pump on min, the noise starts up again but only for a short time. This then...

I turned off the rads when the boiler was running and it made no difference, the ticking was still going, likewise when I alter the thermostats on them Its like the ticking is from elsewhere in the system and then it's getting amplified through the radiators, and for some reason its just the...

I can't see the noise, which halts conversation, is down to some missing spacers, as the noise seems to alternate between the different downstairs rads and the noise itself comes and goes. The rads remain hot throughout though. All a mystery.........

One more thing I forget.. The clicking seems to come and go as it fancies when the boiler is on. Cheers

I have recently moved into a new house which has gas fired central heating, and a Potterton boiler, which has been regullarly serviced albeits about 20 years old. Whenever the boilers on, whether for heat or water, the radiators start to click. Now I mean REALLY CLICK. They sound like theres a...