Timer Tripping (or not)!

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Hi, I have the following set up that trips immediately I turn the switched FCU on. Can anyone explain why?
I had a radial circuit to bathroom (built in former garage space) to switched FCU (with 13A fuse) to electric towel radiator and all works perfectly.
I wanted to add an electronic timer between the FCU and the radiator.
A few years ago a spark tried to fit one for me but it kept tripping (even after exchanging the timer thinking it was faulty) so he gave up and fitted a blank on the box.
Recently I decided to have another go. Unfortunately the spark had cut the cables to minimum to fit them in connectors behind the blanking plate. So, firstly I extended both cables with spare lengths of 2.5mm cable (via the connectors) and wired to the new timer. The timer came on and went off as planned - Happy days :D
I cut the “test” cables to fit in a deeper pattress and reconnected to the timer and fitted to the new pattress.
Now, immediately I switch the FCU on it trips at the board!
Confused? I am! :confused:
 
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Hi, I have the following set up that trips immediately I turn the switched FCU on. Can anyone explain why?
What trips? An MCB or RCD?


I wanted to add an electronic timer between the FCU and the radiator.
Why not just replace the FCU with a timed one? :confused:


Now, immediately I switch the FCU on it trips at the board!
Confused? I am! :confused:
If it works when not fitted into the back box and causes a trip when it is then there's probably a trapped wire somewhere creating an earth fault.
 
What trips? An MCB or RCD? = RCD

Why not just replace the FCU with a timed one?
= I already have two sunken boxes so I will still have two boxes either way (FCU inc timer + blank or FCU + Timer)

If it works when not fitted into the back box and causes a trip when it is then there's probably a trapped wire somewhere creating an earth fault. = Have checked for this but will check again

Thanks
 
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I already have two sunken boxes so I will still have two boxes either way (FCU inc timer + blank or FCU + Timer)
Well, you do now (although could you not get rid of one?)

But at the time, why have a new hole in the wall and 2 accessories rather than just put a timed FCU in?
 

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