Chinook RV

I just bought a 2005 Glacier that has some HWH system problems. The slide won't move but this light comes on. I can't find what it is in the manual. Until I can get someone to look at this problem, my house batteries are draining every night. My guess is that this light has something to do with the battery drain. Does anyone know what this light is for?

Picture is too small for me to make anything out of it. Fortunately, I think HWH system is still in business. Have you contact them about explaining the manual? Sorry, but I do not have a Glacier.