2016 dynamax force bh black water tank flush?

[lee h]

I finally took it out for the first time, and afterwords I emptied out the black water tank and then hooked up a hose for the flush system it has. It's supposedly has sprinklers inside he tank to rinse it out. But when I turned on the hose, I could not hear water being allowed into the tank, I waited 15 min, and during that time I was looking for switches or buttons to press to allow it to do this feature, but found nothing.
Anybody out there used this feature? Any advice would be gratefully appreciated.

[bclemens]

Did you have the black valve open to see if water was coming out?

There is no switch or button...its a direct feed into the tank. The most common problem is the check valve (installed to prevent back flow). Plumbers are used to EVERYTHING running away from the tank. That is the one device that flows TO the tank. So I have seen them installed backward and I have seen them just physically lock up.

Normally there where it comes into the unit (under the lav maybe) there is a line that goes UP (must be above the flood line...so above the toilet drain). There is a check valve at the top of that.

[youroo]

Maybe? Youroo!!

[bclemens]

Normally they look like that or very similar. Thanks for adding the pic

[Raymond Johnston]

I have 2015 Dyanamax DX3
I had same problem the check valve
Was put in backwards on black tank.

[MudyOvl]

I thought I had the same problem in our Micro Lite 23LB. I checked the flow direction and the arrow was pointed correctly (to the black water tank). I took it to the dealer for repair thinking the valve was faulty, but he said it worked fine in the shop. Turns out that the black water tank flush cannot be fed through a pressure regulated hose. It needs to have the full pressure to open the valve and allow water to flow into the tank. Just sharing my limited knowledge. ;-)

[youroo]

Originally Posted by MudyOvl

I thought I had the same problem in our Micro Lite 23LB. I checked the flow direction and the arrow was pointed correctly (to the black water tank). I took it to the dealer for repair thinking the valve was faulty, but he said it worked fine in the shop. Turns out that the black water tank flush cannot be fed through a pressure regulated hose. It needs to have the full pressure to open the valve and allow water to flow into the tank. Just sharing my limited knowledge. ;-)

This May be True for Your Valve but NOT 99% of the ones F/R Installs in the Black Tank Rinse! Youroo!!