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Just for future info. I replaced the old Sunvic select Programmer with a new Sunvic 270 XLS, using the same universal back plate. So far, four weeks of peace and quiet.

Thanks for the reply bhm. The programmer is a Sunvic 207 (not 270 as I thought) I would guess is at least 8-10 years old , may be more. the writing on the buttons is almost worn off. I think I could directly replace with a Sunvic 207XLS ?, as according to the sunvic website the back plate is...

Hi again. Happy New Year. :? Over the New Year period the clunking mysteriously stopped and all was well.Has now restarted this week. There is no clunking in anything other than the programmer and boiler.There is a very slight boiler flame flicker in time to the clunking, but its hardly...

should also add that the clunking is only in the timer and at the same time the boilern not in rads or any pipes. To me it seems electrical rather than mechanical. Everthing at the moment works, but obviously this noise is not right. The odd thing also is that it never happens in the afternoon...

Hi, and thanks for the replies. The clunking has only happened in the mornings. It lasts between 20 seconds and a couple of minutes. Will re happen when the heating comes back on ( when the thermostat tells it too). The clunks happen evrey 2 to 10 seconds ie. multiple in a row then odd ones now...

Happy Christmas to you all. Wondering if somone may have an answer to my query. Moved into our current house last year.My central heating all works well, but the last four days the Sunvic 270 programmer ( guess at 8-10 years old) and Ideal Classic boiler (similar age)"clunk" at the same time...