To replace valve, isolate flow, returnand cold feed at bottom of boiler, release pressure via prv and open hot tap remove micro switch and undo all unions connected to diverter valve, have bowl to collect any water loss as they have tendancy to air lock and can get messy, remove valve and replace with new part, make sure you replace all washers and o rings, then repressure boiler and the close hot water tap and open all isolation valves to locate part you'll need th GC no from data badge
STE
March 2009
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