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Old 02-12-2015, 07:40 AM   #11
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When i hook up the water and turn it on the water hose pressures up. I let it run for about 5 minutes and when i opened the black tank drain nothing came out of it. I will have it back at the dealer next week to fix some other issues i have found I will add this to my list.
Thanks for the help.
Good Idea, when you use your black tank flush you can here it working at the toilet. If not you have a bad valve or a kink in the line. The line is made out of hose material not plex, so it can kink.
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Old 02-12-2015, 07:52 AM   #12
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We have a hose that we only use for black tank....it has no pressure regulator like the fresh water hose that is for fresh water only....we get full faucet pressure into the black tank, so is important to have drain open in case roof vent is stopped up some...
if no leaks in system water should come out vent on roof...and we sure do not want that if we forget to open the main drain.....
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Old 02-12-2015, 08:30 AM   #13
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Crawl under your sink cabinet with a flashlight and look up for the valve. If it's clear, this should work.... Have a helper turn on the black tank flush and watch for water flow up into the valve. If working properly you'll see the water rush into it closing the spring assisted flapper, then run out the other end down into your black tank.
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Old 04-05-2015, 11:44 AM   #14
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My check valve was under bathroom sink and installed backwards from factory, I was able to take it apart and turn it around and all is well, good luck!
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Old 04-08-2015, 06:14 AM   #15
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I have the same problem with new 340x12. No flushing noise, no water out the waste hose.
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Old 04-08-2015, 06:50 AM   #16
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I have the same problem with new 340x12. No flushing noise, no water out the waste hose.
sounds like the check valve is installed backwards or faulty, very easy fix although I'm not sure where yours is located, maybe under your bathroom sink, it has a water line in and water line out, just unscrew both and turn it around and reinstall,, good luck
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Old 04-08-2015, 12:52 PM   #17
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It's probably the vacuum breaker in the bath lav. We had a rash of them that were made wring
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Old 04-08-2015, 01:09 PM   #18
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It's probably the vacuum breaker in the bath lav. We had a rash of them that were made wring

So should I remove, 180 it, and reconnect just in case it's installed wrong?
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Old 04-08-2015, 03:18 PM   #19
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I'm guessing that it is another one made wrong. You can try if you like.
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Old 04-08-2015, 03:40 PM   #20
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I'm guessing that it is another one made wrong. You can try if you like.
Can or will you explain what good they are in the first place?
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