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Onlyfitidealboilers, Tried isolate the cold water supply to the boiler and still see the 'd' light coming on albeit with less frquency. This is now getting more confusing......need a stiff drink I think. Seriously though, what can I do?. Rgds

Thanks to both 45years and onlyfit. I will try isolating the cold water to the boiler and see if it stops the d light coming on. 45yearsagasman, Thanks for you comment. Unfortunatley I am not on a water meter, any thing else I can do to see if there is a leak, apart from taking out...

I have an IDEAL HSAR HE35 COMBI BOILER. This was fitted about 5 years ago and has been giving me problems since 2007. First of all the water heat exchanger had to be replaced. Last year it had another problem wher the 't' light used to come on so frequently, it did not allow heat or hot water to...