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Thank you everyone. Solved..... turns out the wiring from the Honeywell type V4600e was wrong since install (2006) the earth and neutral. This was never picked up until we had a new RCD consumer unit. Heating/ boiler comes on no problem now. Very much appreciated. I will look into the...

Thanks, will check this out. But visually it looks dry but will investigate further

Thank you everyone for your feedback. It will try to be less confusing with my explanations. When you turn on the fused spur it trips the rcd (straight away) We found that 1 of the 3 blue wires in the connector on the left was measuring to earth (using continuity). The wire was connecting...

It is one of the blue wires on the left. The one with the 3 going into the same terminal. One blue goes from the fuse spur, the other to the wiring center and the other to the boiler below. (This is the one that ‘goes to earth’ when tested with a multimeter on continuity.

Hi, thank you for your reply.... update. Had a boiler breakdown engineer who thinks it may be the wiring center upstairs next to the tank. He wasn’t 100% but recommended changing it.

Hi everyone, I am after some advice. We had a new consumer unit fitted with an RCD and when we switch the boiler/heating on it trips the RCD. The boiler is wired to the consumer unit via the ring main with a 32a fuse. We have an old boiler (ideal Mexico floor standing boiler with a separate...