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Old 11-18-2015, 04:07 PM   #11
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Originally Posted by Mowinks View Post
Yes, the black tank emptied. This happened on 2nd back flush when we overfilled tank
So is this how you backflushed?
close sewer valve
turn on water to backflush black tank
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Old 11-18-2015, 04:10 PM   #12
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I left the black valve open the entire time when flushing and back flushing. We had water on bathroom floor which was indicator of overflow. No recent shower so likely not condensation from shower, however we're in SW Florida where temp is 89 and AC is working overtime.
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Old 11-18-2015, 04:18 PM   #13
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I'm confused. The valve was open the entire time and it still overflowed?
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Old 11-18-2015, 04:25 PM   #14
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Me too (I'm confused )

So you had the black valve open, the backflus on, water from the black tank was flowing from the black tank to the sewer hose and it still overflowed?

Were you using something like this?
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Old 11-18-2015, 04:34 PM   #15
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Think it's your check valve in the tank flush line....possibly located in sink cabinet
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Old 11-18-2015, 04:41 PM   #16
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When water pressure is applied, through the flush line, a plastic disc in vale is pushed into a seat, then the pressure open a back-flow check valve (in same housing), then water flows to tank. If disc doesn't seat, we have water where it's not needed.
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Old 11-18-2015, 04:50 PM   #17
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Originally Posted by Mowinks View Post
I left the black valve open the entire time when flushing and back flushing. We had water on bathroom floor which was indicator of overflow. No recent shower so likely not condensation from shower, however we're in SW Florida where temp is 89 and AC is working overtime.
I'm guessing like Bob, you really didn't have a tank overflow causing the water on the floor and ceiling by the skylight. Rather, the back flow/anti-siphon valve plumbed into your tank flush line was/is leaking and water sprayed out of it.

As mentioned, it is 'usually' near the bathroom sink inside the vanity.
I realize it's a stretch to believe the water sprayed out through the vanity onto the shower skylight but stranger things have happened.
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Old 11-18-2015, 04:58 PM   #18
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Were any out side (roof) vents open that day? While in Nashville last summer and it was HOT, our air ran all the time...vents were closed...found condensation in bathroom and next to a/c in kitchen one morn. Opened 2 vents, dried up water, and no more problem
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Old 11-18-2015, 05:16 PM   #19
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I'm not in the unit presently. I'll check the valve under the vanity when we return. Thanks for all the help/suggestions
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Old 11-18-2015, 08:08 PM   #20
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Back in unit for the night. No indication of leakage under the bathroom vanity. As initially stated, could this be a combination of toilet overflow and breather pipe filling and spilling into shower skylight? We had rain tonight and no indication of roof leakage into the shower skylight.
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