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Starting afresh and organising the wiring was beyond me but fortunately not my son-in-law. This was however necessary and identified a blue wire from the room thermostat as not being connected and the earth as being the neutral. Not surprising that the mcb was triggered(not the rcd). Thank...

I was not working live and the connection is not obviously wrong. The wire is now isolated, that is, taped up and should work as the connection of that wire was the only factor that was linked with the rcd cutting the supply. The hope is that when the boiler cuts out and the fault is cleared it...

When connecting a honeywell 4043 motorised valve the boiler rcd shut off the electrical supply. This seemed to be related to connecting the brown wire from the valve which connects to the room thermostat. Potentially offending wire is isolated but rcd still trips. Is there any way of resetting...

Would a sticking motorised valve be sufficient to trip the boiler rcd? Is there a way of resetting the boiler. The background is that I replaced the head on Honeywell v4043h motorised valve controlling the central heating with a second hand one because the previous head was making a dreadful...