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BDL, Thanks for the response - it gets serviced each year and, supposedly, all the oxide is removed. It is due for the next service in about 2 months. I have to say, I was surprised at how much oxide I found in the combustion chamber when I checked it out earlier today. In my other house...

I have an Ideal Standard Minimiser SE (condensing boiler) that is proving difficult to sort out. The problem is that every morning the boiler fails to light - both hot water and heating circuits are calling for heat, and the thermostats are working, but no flame. The boiler runs through the...