Sussex EB mains electrics

There are three mains on/off switches next to the ECU (under the bench seat). One is for the water heater and One is for the space heater. I assumed the other is for the 13 amp sockets but it does not isolate them - when it's in the off position the sockets are still live. The handbook and wiring schematic don't identify its purpose. Does anyone know the purpose of this switch ?

I have a Broadway, there is a third switch under the cooker for the electric unit on the hob could yours
be for the same purpose?

Fridge mains? or electric hotplate on cooker?

Sorry Cyclo, posted same time, great minds etc!

The wiring diagram in the Sussex Owner's Manual shows only two MCBs used - the 10A one for cooker/hotplate should also cover the mains sockets - does it not do so?

This may be for the habitation a/c unit if fitted and correctly installed by AS
On my 2012 unit the a/c was fed direct from the 6amp breaker and it tripped every time the compressor cut in. As it draws about 8-9 amp it was never a good installation and it was an original AS fitting!!
I have fitted a 20amp double pole isolator and fed it from the 10 amp MCB 
Now waiting for Marquis/Dometic to replace the faulty pcb. This costs around £320 plus fitting, must be gold plated.

Hi On our Sussex EB it's for the aircon unit, it is not labelled.

Biker51 wrote:Hi On our Sussex EB it's for the aircon unit, it is not labelled.

Thanks I'll check it out. Never considered the aircon but it makes sense.

roger7webster wrote:This may be for the habitation a/c unit if fitted and correctly installed by AS
On my 2012 unit the a/c was fed direct from the 6amp breaker and it tripped every time the compressor cut in. As it draws about 8-9 amp it was never a good installation and it was an original AS fitting!!
I have fitted a 20amp double pole isolator and fed it from the 10 amp MCB 
Now waiting for Marquis/Dometic to replace the faulty pcb. This costs around £320 plus fitting, must be gold plated.

Thanks Roger probably is the aircon , I'll check. Incidentally I have AS fitted aircon and used without cut outs. I'll also check the breaker capacity.

-mojo- wrote:The wiring diagram in the Sussex Owner's Manual shows only two MCBs used - the 10A one for cooker/hotplate should also cover the mains sockets - does it not do so?

Hi, It's not the MCB's I'm querying but the THREE 13 amp switched isolators. See other posts. Thanks anyway.

cyclo wrote:I have a Broadway, there is a third switch under the cooker for the electric unit on the hob could yours
be for the same purpose?

Hi, The cooker is all gas but it could be for the aircon (see other posts), or the frdge.

boggythediver56 wrote:

Biker51 wrote:Hi On our Sussex EB it's for the aircon unit, it is not labelled.

Thanks I'll check it out. Never considered the aircon but it makes sense.

Spot on . It is for the Dometic aircon.

Another mystery solved.