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Less than an hour from memory. They remove the case, access the burners, etc but not stripping it down to the heat exchangers, say.

Sorry forgot to add that, yes it has been serviced about once every 18mths on average. Was serviced/checked 12months ago but of course behaved itself when the engineer was here :( and my descriptions of the problem didn't seem to bring any look of worry at the time.

Hi, my boiler is about 7 years old and when the heating is on (DHW is fine no noises, etc) I get a kettling noise which occasionally becomes louder like pop corn with the occasional louder banging. This started about 2 years ago and has steadily got worse although during that period it can stop...