What is this switch for

Hi, on my 2018 Kingham there is a switch under the sofa near the electric box, what does it do? I have looked at the manuals and cannot find any link to it. It is an autosleeper switch with the red light.

There was a switch in a similar position in our Warwick XL …. it disconnects the heating pad under one of the tanks (sorry can’t remember if it’s the fresh water tank or the grey water tank). Peter M

Grey water heater isolator as it might be empty when you arrive on site and choose to use the tank heaters

Ifs it’s the same as this , it’s the tank heater switch as mentioned

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It is for the grey water tank, in case there is the possibility of frost you don’t want this water to freeze. On if it is icy and there is water in it. Otherwise off.

As the others have said.

Turn on the heaters at the panel. If this switch is illuminated, the waste tank heater is on. They're not supposed to be used with an empty tank, so, you can turn off the waste tank heater.