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The RCD trips. On the CU it had “boiler“ and “immersion” on the MCBs so I turned both off, then proved tested proved to confirm it was safe. 

Thank you, I’ll check tomorrow but I have a feeling you may be right. I think the power comes from the same circuit as the the immersion and not the boiler. I know someone was there before me but wouldn’t tell me what he had done. 

No I haven’t, that will now be my next step

Well there is a possibility, but I think the chances are very slim. So that’s why Im more focused on the electrics at the property. Honestly I really dont know.    I’ve wired this without the pump connected, ive wired it up with NO neutral between the neutral wiring center terminal and the...

In theory you could run L from the supply straight to the control R and control N back to N. But I will still be getting 180v on the N on the control N. 

All connection are tight, polarity has been checked, the boiler before had the same problem, literally swapped it for a new one, still same problem, so I removed all the external controls (s-plan) and rewired a simple set up as shown in the picture. I even fed the supply from a different circuit...

Earth to Neutral on “conn1”, yes it’s the only way I can measure it disconnected, if was connected then it would trip

Sorry about the drawing but I hope this helps

1 supply to the boiler and then the control signals (which is supply by its own supply). I’m getting 180v on the neutral on the control signals. If that makes sense  From the boiler

Hello people, I need some help please.  I’m having trouble with a heatrae sadia amptec c400 shorting out, the set up has 2 power supplies going to the PCB.  1 being the main power supply going into terminal “conn5” (L,N,E) with correct polarity, 2 being power for the controls “conn1”  (N,R)...