Originally Posted by Protagonist
Most likely cause is that you turned on the macerator pump while the red valve at the end of the discharge hose was closed.
No telling what the dealer may have done before I bought it but I know I have never closed that valve. Frankly, I don't really see why the valve is there. The only thing it can do is cause problems. In the winter closing it could result in a ruptured hose since you can never get all the water out of it. Leaving it open gives any expanding freeze a place to expand. The only thing it is preventing from leaking out is a bit of soapy water from the grey tank since I finish every dump that way. I just leave it open and let it drain/dry out.
I can say that no matter how careful I am the hose always binds up just a little before I get it all the way in so there is the possibility of it getting pinched. The replacement has been on there for almost 2 years though, it binds up just as much as the OE hose did and the replacement has never had a problem with a leak.
I do leave about 18" to 2' feet off of the reel. I find having that last little bit of play makes it easier to work the valve contraption into the compartment and perhaps prevents the worst of the binding. Maybe that modification to my practices has prevented the re-occurrence of the problem.