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Old 09-20-2010, 08:50 PM   #1
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flagstaff hw27sc sink wont drain

Just bought unit used and sink wont drain without dump valve open. I verified 6.5 gallon tank. Checked vent stack in cabinet near sink bowl and replaced for good measure and still wont drain. If I unscrew the stack vent until it lets air out around the threads, then it drains. What am I missing here?

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Old 09-20-2010, 09:48 PM   #2
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Sounds like your main vent is clogged on the roof look in it and see if it has a blockage

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Old 09-20-2010, 10:09 PM   #3
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is the tank full it is trying to drain into?
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Old 09-20-2010, 10:33 PM   #4
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On some Flagstaffs the vent is under the kitchen window in an area close to the sink on the outside. Make sure you don't have a dirt daubers nest clogging it.
2006 Flagstaff 831RLSS Travel Trailer

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