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Looking at the HSA3 valve - the lever at the top was almost solid,I have moved it around and now moves much better,could that have been a cause? I have traced the wires and yes the earth shown in the pic does go to "HF Off" as oldbuffer suggested.

Thanks for reply Jackrae. The picture is how the RWB2 backplate was wired and since it was damaged just replaced it in same wiring order as the shop advised. So is the earth not needed for T721R?

Hi all, Yesterday my mains trip switch triggered and eventually narrowed it down to the CH/Socket electrical circuit. When I turned the mains on with all other plugs removed the trip activated and saw sparks from the timer switch. After removing the cover (RWB2) this is what had happened...