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Old 08-08-2015, 11:25 PM   #1
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Black water flush doesn't work

I'm the proud owner of a 2012 Berkshire 390FL.
I bought it used about 4 months ago and tried using the black tank flush today. It sounded like water was spraying into the tank but nothing was coming out of my drain line. After a couple minutes I noticed water dripping from the storage compartment below the bed slide.
It was dry under the bed so I'm guessing there is something happening under the floor???
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Old 08-09-2015, 11:27 AM   #2
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On the PS of your coach there's a cargo door without a latch lock on it. That's the access to your water pump, black & gray water tanks. Open that cargo door, you will need something to prop it up, there should be a couple of screws holding a white panel in place, remove that. Once you have that removed you are looking at your black tank. On top of the tank you should see a hose connected to a fitting held in place with four little screws. That's your tank flush. Take the screws out and the flush nozzle can be removed. Pull it out and go turn on the black tank flush water to check that water is being flushed through the nozzle. If it is coming out, look in the black tank, you will see water in there. If all that plays out then you have problems either with your dump valve not working properly or the tank is clogged up somewhere.
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Old 08-09-2015, 02:08 PM   #3
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I had the same problem ( on a new 2015 40xl). With the same symptoms.

It turned out that they forgot to assemble the valve underneath the shower !!!!!!!����

You need a FR dealer .
Call : Mike 574-293-6137 at FR service he will help you .

P.s.
I fixed mine with several other minor problems at the factory in Indiana ����
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Old 08-09-2015, 07:01 PM   #4
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Interesting...I looked in the access you were talking about, Cajun, but the leak is on the drivers side and I can't see that side they this access.

I'll pull the access panel at the base of my shower and see what's in there.
Pretty sure no water is going thru to the tank because when I removed the water hose from the flush connection, water came back out of it.
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Old 08-09-2015, 07:12 PM   #5
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Nothing under the shower. Guess I'll end up pulling that connection out of the blackwater tank next. Still have to find where it's leaking tho (or don't use the flush &#128543
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Old 08-09-2015, 08:32 PM   #6
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Do you have washer/dryer or the prep for one? If it's in the back bedroom like mine it may be that water line that is leaking. Try shutting off the washer lines at the manifold, both hot & cold to see if the leak stops.
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Old 08-09-2015, 09:07 PM   #7
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The leak was only happening while I was using the tank flush.


2012 Forest River Berkshire 390FL
2013 Hyundai Veloster
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Old 08-10-2015, 02:03 PM   #8
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My issue with the flusher way they installed the check valve backwards at the factory. I had water leaking down into the storage compartment under the bedroom. They did fix it and I dryer it all out.
Some people say China stuff is bad quality. We should be do it right here the first time and be proud.
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Old 08-10-2015, 08:53 PM   #9
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I'm away from home right now so I cannot check mine, but does that compartment maybe have some visible water lines at the top of the compartment?
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Old 08-11-2015, 08:03 AM   #10
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Quote:
Originally Posted by barrie1 View Post
My issue with the flusher way they installed the check valve backwards at the factory. I had water leaking down into the storage compartment under the bedroom. They did fix it and I dryer it all out.
Some people say China stuff is bad quality. We should be do it right here the first time and be proud.
There is no time to do it right the first time !!!
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