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Old 02-19-2016, 03:16 PM   #1
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Black Tank Flush

The flush doesn't work. Looks like it plumbed wrong unless I'm missing something. Blue pex goes from flush inlet up into coach up through floor, back down into black tank. ? Is there a check valve somewhere? If so, it may be installed backwards .. water does not flow at all..

Thanks
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Old 02-19-2016, 03:25 PM   #2
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Yes there should be a back flow preventer somewhere in the coach usually in the bathroom vanity...
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Old 02-19-2016, 03:31 PM   #3
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Thanks for the quick response. . I did find it.. my guess is, the lines are reversed. Wonder does it have to be on that upward position to work..

Thanks for taking the time and send a picture.
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Old 02-19-2016, 03:36 PM   #4
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First I would tap it with the handle of a screwdriver to see if stuck and try black flush again. If not working then I would try reversing connections. On occasion people reported that the actual nozzle in the black tank was filled with construction debris (sawdust) thus preventing working properly.....good luck.

There are many threads on subject....

https://www.google.ca/search?q=black...rqHYaneqG8j5AM
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Old 02-19-2016, 03:43 PM   #5
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Yes...the check valve has to be above the flood line (aka above the toilet drain) per code.
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Old 02-19-2016, 04:33 PM   #6
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I removed the check valve it appears to be free from debris. My guess is as suspected, the lines are backwards. I removed the line from the black tank itself and nothing.

Im shorthanded today. When I get it back home I'll have a partner bolw compressed air through the line with the valve removed and see whats going on.

The valve has to sit as shown in picture in order for it to function properly.
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Old 02-19-2016, 04:56 PM   #7
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Usually the inlet (from your hose) is at the bottom and the outlet (to your tank flush) is on the side. See pic on post #30 here:

http://www.irv2.com/forums/f112/tip-...-270158-3.html

They probably come up through the same hole and the guy could have easily got them mixed up when he put the valve on.
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Old 02-19-2016, 06:04 PM   #8
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same same

Ive had the same issue with our DX3. To date I have not explored the issue.
Looking forward to your conclusion to help me troubleshoot ours. Please keep us posted......Bob
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Old 02-19-2016, 06:33 PM   #9
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I only post this as a reference for a typical black tank clean out system installed at the factory.
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Old 02-19-2016, 07:29 PM   #10
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I will get to the bottom of it and let you know.. pretty straight forward I would think. Either the lines are reversed at check valve, or bad check valve. Kinda of a pain to get to, but could be worse. ;-)
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