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The 838 is 32KW not 38

The DO is set for the rad output which is 24KW

I have a 6 year old Vaillant Ecotec Exclusive 838 that regularly shuts off. This has happened since new and seems to happen the most when the heating is on (but not necessarily actually running ie just sitting at the programmed temperature) and then you turn the hot water on. There is a very...