Black tank auto flush

[johnpjpa]

Well ,we took our new 2010 Montana 3400RL for 10 days visit to Branson MO first time use for shake down .
I guess my first mistake was ,I forgot to secure the sliding door strap that separates living area from bedroom and
The door slide attach to the sealing came loose ( I can,t believe how small the screw are to hold a fairly heavy sliding door )
I did fix it with bigger screws and hopefully it will hold .
My other problem is that the so called black tank flush is not working ,when I connected the water hose I heard the inside sprinkler
Start spinning and water spraying ,this lasted less then 10 seconds and quit working .
When I disconnect the water hose I have lots of back pressure , I assume that there is a valve in the system that must be stuck.
I am wondering if any of you had the same problem before and if it is a easy fix.
The RV is under warranty until mid February but we are going to use it a lot this summer
We are going to San Diego in September and in November
Spent the winter in Rockport Texas until march
there is a Montana dealer in Rockport and we eventually could have it fixed up there .
For right now I will use a wand to rinse the black tank and hopefully it will do a good job
I don,t mind using a wand , not convenient but at least I no it is working
Should I get it fixed or keep using the wand ?
This is the only problem I have so far and I would hate to have someone remove the black tank ( even under warranty )
If the wand will do as good a job cleaning the tank
I would like some input
Thanks John