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In my open vented Y plan system when heating up only the DHW cylinder with the boiler flow somewhere around 70C the S53 code is regularly appearing if the CH is then turned ON. The system is clean, the pump is healthy (set to max speed) and flow is good even when only DHW is being heated. I can...

This has been working OK for almost 2 years supplying central heating and a hot water storage tank (with extra large heat exchanger coil). The only slight problem is that the boiler is frequently "caught out" when only required to heat the water tank. It starts up at reduced power for...