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Interesting, thanks. There are a number of zone valves - it’s quite a complex system. There are the upstairs & downstairs heating loops, downstairs is also split into radiators and underfloor heating zones with heatmiser manifolds. The hot water system has two hot water tanks each with a zone...

Hi, We've relatively recently bought a house with a DDC420 controller and are struggling to understand some of it's behaviour and wondered if anyone could help. The main problem at the moment is that the boilers seem to fire even when there shouldn't be any demand on them. An example from...