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Thanks for your prompt reply. So are you saying that it isn't a problem with the heat exchanger? Could this not be the cause of the heating switching off after 30 seconds? Also, is powerflushing likely to make the difference as I have already had the offending radiators taken outside and...

I have a 10 year old Potterton Puma boiler. The heating is coming on as usual but it cuts out after about 30 seconds and then starts again after another minute. It repeats this pattern all day. Consequently it takes at least an hour for any heating to get through to the radiators. When they...