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Yes its a Honeywell V 4073. I don't think it can be miswiring as it's only recently started to happen.

Since I partially drained and re-filled my heating system (to add anti corrosion additive) I've had intermittent problems with my hot water. The system is pump driven heating and hot water using a 3 way valve - looks pretty standard. When the heating/water is switched on automatically (i.e. by...