Horstman water heating contoller wiring

[the pict]

I have two supplies into a new horstman e7 box, 1 from the offpeak water heating one from standard tariff boost do both suppies go to 1 and 2, 4 &5 linked, when wired this way boost RCBO trips ,if I remove the off peak it works albeit no off peak I fitted 2 new RCBO boards a while back but there has been a DIY joinery effort at boxing everything in since

 

[westward10]

You only link 4 and 5 if there is a single immersion element. Not something I involve myself with but why do you have two supplies?

 

[Avo Mk8]

The Horstmann E7 is a controller designed for a single supply input, ie where you don't have a separate off-peak CU.
You cannot use it for independent on-peak and off-peak supplies.
Horstmann make alternative models for dual supplies. Used to be the E7BX but I think that's obsolete.
There is a BX2000 which takes sepearate on and off peak supplies in.

https://www.tradesparky.com/ecommerce/downloadasset?productAssetId=677309

 

[the pict]

The Horstmann E7 is a controller designed for a single supply input, ie where you don't have a separate off-peak CU.
You cannot use it for independent on-peak and off-peak supplies.
Horstmann make alternative models for dual supplies. Used to be the E7BX but I think that's obsolete.
There is a BX2000 which takes sepearate on and off peak supplies in.

https://www.tradesparky.com/ecommerce/downloadasset?productAssetId=677309

Cheers for that