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As you surmised, reduction in the thermal store temperature was achieved by lowering the boiler temperature. It's now been increased but the boiler temperature still isn't set to MAX as the manual suggests but it's high enough (around 67C) to satisfy the Boilermate and stop the boiler from...

Our problem seems to be the opposite of other threads I've seen as the hot water from our taps is extremely hot (over 45C). I've replaced the thermostat but it makes no difference. Cycling through the SW1/SW2 fault finding the DHW T3 reads 47/48C with a hot tap running. BGas solution is to...