Originally posted by Mavis
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As for inbuilt strength for so constant switch in of boilers I m not so sure, in November mine will be 18 years old. In that time we have had to replace the fan twice and that is £300 a time. The fan wears with constant on/off. Like you I also have heard the boiler come on for a short time despite every zone being way above set tempersture. It also happened yesterday, we had a warm day yesterday, no need for the heating to come on but it fired and having checked no zone was asking or needed heat.
If I go back to optimisation then I know I will have more frequent short cycles which do not seem to do anything plus I will have to change the set points so that optimisation comes on when I want the heating to come on and not an hour before. It would also switch off too soon as well such that we would have to put the heating back on. I suppose not now, it's 11C outside, clear blue sky and temperatures are rising - got the loos to clean before I can enjoy it though!
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