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OK, so no one brave enough to guess what is wrong? Good news it is fixed. Answer: circulation pump needed replacing. It is not immediately obvious that the pump was shot - it sounded ok, made the right noises, and even went round. However, the lack of circulation resulted in the boiler...

Our Ideal icos boiler is continuously cycling. It fires up for about 45 seconds and then stops for a while (perhaps three mins) before restarting. There are no fault codes. The valve is operational (2 valve system) and the pump appears to be working too. Hot water gets around enough for...