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Your understanding/interpretation of S10 is different to mine. I thought S10 simply meant that DHW demand had been detected at that time but nothing else was happening (eg: no ignition, no over-run, etc). If the flow rate is 5 or less then the boiler cycles, 6 or above and it's fine. I've...

Thanks for the reply. I'm trying to understand why you think it might be the flow sensor? The boiler is reporting a varying flow rate when I open the tap further. It is detecting constant demand when the tap is opened (tap icon on the display). Yes, I believe the minimum flow is 2.5/3lpm which...

Hi all, I have an old Ecotec 837 combi and experiencing the usual hot/cold/hot cycling issue with my DHW (S14/S10/S14 - Ignoring the other steps). There are no faults codes on the boiler. If the flow is around 5L/min it goes hot/cold/hot/etc. If I increase the flow slightly it stays hot. I...