Black tank flush inop

[turbosi44]

Hi everyone I'm new to the forum and brand new to rv's . We just picked up a leftover 2014 xlr 29hfs and used it 2 times and dumped the black tank for first time and after hooked the garden hose to the black tank flush and nothing happens no water nothing. Please help thanks in advance

[davel1971]

possibly line kinked or something restricting line left over from assembly. Since its under warranty, don't waste to much time with it

[Ford Idaho]

During the two times that you have used it did you have the drain valve open?

[turbosi44]

When we picked it up they left all the valves open and we did not know till after the first couple #1's ( no #2's )closed them all and went camping 1 time after that

[Ford Idaho]

I suggest you put about 8-12 gallons of water and 10 pounds of ice cubes in the tank and go for a drive.
15-20 min with a number of turns to get the ice and water moving around in the tank then go try and dump it.

[davel1971]

Originally Posted by Ford Idaho

I suggest you put about 8-12 gallons of water and 10 pounds of ice cubes in the tank and go for a drive.
15-20 min with a number of turns to get the ice and water moving around in the tank then go try and dump it.

I think we are fixing a flush problem, not a drain problem Aren't we?

[turbosi44]

Ford Idaho can you explain please

[turbosi44]

Yes the black tank flush option my rv has built in

[Platokidd]

Can you hear the water squirting in the tank? I know sometime we get a tp clog and nothing come out.

[turbosi44]

No noise and no pressure loss when turning the water off to remove the hose

[davel1971]

nothing you can do but trace the line to make sure its not kinked. If not, its plugged with something or the flush valve itself is bad or not installed properly. Or take it in for warranty

[Ford Idaho]

Originally Posted by davel1971

I think we are fixing a flush problem, not a drain problem Aren't we?

Yep and if the dried up stuff in the tank is going to get "flushed" out in needs to be "rehydrated" and broke loose could be why there is no water coming out, plugged drain?

[turbosi44]

I will take it in thanks for all the help

[davel1971]

ok, so what is really happening. Is nothing coming out when you attempt to drain the tank or is the black tank flush not squirting into the tank? Think we are a little unsure. Just want to make sure we give accurate advice

[turbosi44]

Not squirting into tank

[davel1971]

is the line accessible to trace or is it all hidden? Don't mess with it to much and risk dealer not fixing it under warranty if it comes to that

[the.wilsons]

I think there is a check valve in line and it could be installed backwards.


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[dave961]

I have the exact same issue with a new 27HFS. I hook up a hose and turn the water on, but no water ever goes into the tank. I had a smell issue early on and have done the ice trick a few times. I've also filled and flushed it many times with all sorts of chemicals. I'm hoping it's not 'stuff' stuck to the flush inside the tank. I plan on getting under it and trying to follow the line from the tank up. If I find nothing, I'll brave taking it off the tank.

[DaGrinch]

Originally Posted by dave961

I have the exact same issue with a new 27HFS. I hook up a hose and turn the water on, but no water ever goes into the tank. I had a smell issue early on and have done the ice trick a few times. I've also filled and flushed it many times with all sorts of chemicals. I'm hoping it's not 'stuff' stuck to the flush inside the tank. I plan on getting under it and trying to follow the line from the tank up. If I find nothing, I'll brave taking it off the tank.

For your "smell issue", I think I'd check this thread first, especially if you have a model 300 Dometic toilet!

[Buddy Duncan]

I had an issue with my dump, only slightly different. When I used it water came out from below the bathroom sink. I followed the hose and discovered a back siphon unit up below the sink, (higher than the tank). One of the connection nuts was loose. A quick tighten and problem solved. What I did notice was this siphon unit is directional, so perhaps yours is in backwards and acting as a check valve.