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I have done that already but there is no worthwhile material in there to help. Hence desperate post Have contacted Honeywell by email but noone knows product. Will have to replace with new type thanks anyway just hoped someone would have worked on one

I have a CH/HW primary circuit which heats flow to a honeywell V5069D mixing valve. HW and towel rails heat ok on 2 way valved circuits. M676A head sits on V5069D valve and governs water temp to u/f heating manifolds but none are working. System also has programmer and control box with wiring...

Does anyone know the startup sequence not listed in their manual, which has possibly the worst flowchart in history

If you have any problems with boilers, i can help