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I have a Vaillant system comprising Ecotec System Boiler, Unistor unvented system, and VR 65 control unit with NTC connection to the cylinder. By default the boiler is set to give priority to hot water requests (thus closing the CH valve) but this can be changed to allow both heating and hot...

This should be an easy question for the Vaillant experts out there. I have recently had a 618 system boiler, Unistor 155, VR 65 and VR 360 programmable room stat fitted. The VR65 is communicating with the Unistore via the NTC. I have set the DHW temperature via the VR360, and everything seems...