Originally Posted by blw2
I'll take your word for it, but it makes no sense to me why the fresh water pump would be labeled "Dump", and not "Pump".
I was just guessing, but I would have thought it might be something like a macerator sewage dump pump
or perhaps one of those two tank set-ups where one tank has a macerator pump that transfers to the other tank for gravity dumping.
Why not flip the switch and see what happens?
In his post Paul mentioned that when he turns the switch on nothing happens.
My WAG is the switch is mislabeled and the switch must be on and then the switch in the bathroom must be turned on for the water pump to operate.
I also thought of the sewage pump angle as well but the owners manual does not mention having to turn on any switches to dump grey or black tanks.
Again, this is a WAG on my part but it would only take a minute or two to verify.