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£300 new.  £60 second hand.  Managed to. Get new with damaged box for £180. 

Ok. That was my thinking ( heating element) and that's what I tested. I went on you tube and watched a video by the shower doctor.  PICK tested the resistance and was getting low readings. He said I should be getting 11-18 ohms. I was getting 0.5 ohms. On both the original one and the second...

I know, I'm trying. Can't get hold of my mate.  I could do it.  Just a lot of wires.  Can I disconnect from RCD? Instead of the CU, and test at shower end?  What I have just done is with RCD switched off, put my probes from multi meter in pole switch. L to E and N to E and then in shower...

Checked cables in loft and visibly that are ok.. could have chewed some under floorboards.  Forgot to mention, that shower runs on cold, but as soon as you turn the heat up, and the switches in the shower start switching, it trips the RCD.. Those resistance test, as I'm not to confident I'm...

 Residual current? No cert as I fitted it myself, as per sparky  friends instructions. Worked fine for years. Access to hand held multimeter. Is installed as follows..... CU to separate RCD (10mm t&e) 300mm length Separate RCD to double pole switch (6mm t&e) 9 meters approx length Double...

I hope someone can help me.  Firstly I am not a electrician. But I do know a fair bit about most DIY.. Recently my mira advanced ATL thermostatic shower started tripping my separate RCD. As I was not sure that the shower was at fault I brought a like for like second hand unit and replaced it...