Warwick Duo what's this switch

Hi have recently joined the forum having just purchased a 2013 Warwick Duo. All good so far but have found a small black switch with a red led mounted near the front of the offside bed box. Can find no reference to this in the manual. Any ideas what this is for. Have lifted the cushion and the wires from the switch disappear under the trauma heater. I have a photo of the switch but not sure how to attach.

Peter Brown wrote:It could well be to operate a heater on the water tank, in 2013 that would probably of the type that is a rubber blanket glued to the bottom of the tank.

That is what it is on my 2015 model but unclear in handbook.

If it's the same switch as on our van, it's an isolation switch for the heated blanket in the grey tank.

So you can heat the fresh tank without heating the grey (i.e. If the grey is empty)

Like so:

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