obviously you need to trace why the boiler is getting a feed when it shouldn't, the first thing that comes to mind is a zone valve, if there are 2-2port valves the orange wires should not be live when both valves are closed,try disconnecting them ( the orange wires ) and powering up to see what happens,as I find in lot of cases like this the supposed experts do not apply any logic to the fault finding process I mean why change the pump it has nothing to do with firing the boiler up.If the fault persists you need to trace why it is getting a fire up signal, from the boiler back to source,not hard job to somebody who knows what they are doing
toptrish
November 2013
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