Dimplex Quantum storage heaters - I’m tearing my hair out

[tibs69]

Yes the rcbos are tripping in a adhoc basis they trip as it switches over to off peak they don’t always all trip together one seems more prone than others

 

[flameport]

Would that not cause the trip every single time they were switched on?

Not necessarily. Depends on where the problem is.
Doesn't even have to be on the same circuit, a link between N-E somewhere else could cause it to trip, but whether it does would depend on the loadings of the other circuits and how much current flows between the various interconnected parts.
It's a TN-C-S arrangement so there are all kinds of ridiculous current flow possibilities.
These heaters also have 2 separate circuits to them, with 2 separate CPCs to 2 separate consumer units, so that will add even more possibilities for current to be shared between various conductors in complex ways.

 

[mikehammer69]

Rx

Not necessarily. Depends on where the problem is.
Doesn't even have to be on the same circuit, a link between N-E somewhere else could cause it to trip, but whether it does would depend on the loadings of the other circuits and how much current flows between the various interconnected parts.
It's a TN-C-S arrangement so there are all kinds of ridiculous current flow possibilities.
These heaters also have 2 separate circuits to them, with 2 separate CPCs to 2 separate consumer units, so that will add even more possibilities for current to be shared between various conductors in complex ways.

Ah I don't know about all that

N-E links and loadings is more of an issue with shared RCD trips

2 CPCs commoned at an appliance , dont see what bearing that would have on rcbo imbalance

Not saying ihave the answers either , I don't, save for my suggestions