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The only time mine has ever burped is when the black tank is full. Are you sure the tank is drained? By checking the valve do you mean you pulled the T handle? Could be the valve did not actually open if the cable has broke or come loose or there is a problem with the valve or if the outlet is plugged.
I have a clear 6" extension on my sewer connection so I can see when tanks are draining and when the draining has completed.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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Hybrid Mode
