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Putting personal passions aside, I am a great believer in the 80:20 rule. 80% of the benefit for 20% of the effort. There's more to know about central heating than I could ever hope to learn, so to ScottishGasMan's point, I am going to kick back and enjoy. You guys have been stellar, and I can...

I have no idea about my zone valve - how would I find out?

Hi D_Hailsham, Such fun, who would have known! I have a Smart System (Heat Genius) with individually controlled radiator valves which I believe can cause some variation in the return temperature, depending on which radiators are on? Measured just now d.40, the flow temperature is 71 and...

ScottishGasMan - that's one scary rabbit! Ok - I have changed d.0 to 15 and as soon as I did so, the boiler behaviour changed. My conservatory radiators are hot to the touch for the first time in a number of years!! The outflow from the central heating pump remains hot (boiler on or off) and...

Hi picasso, Thanks for coming back to me. I have 14 radiators, but two of those are double size. If I press i while the radiator is flashing I get S.7 - Pump over run The pump is a Grundfos type UPS2 - see the image below When the pump is running one blue LED is lit. I will have a look...

Hi, I am trying to understand the root cause of my radiators getting lukewarm at best. I have an ecoTEC plus 428. It doesn’t display any fault codes, but it spends most of its time with the boiler off, displaying a blinking radiator. Seemingly, as a consequence, my radiators never get more...