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Old 05-14-2016, 08:49 AM   #1
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vac sys toilet

we have a 2015 35e fleetwood excursion with a dometic vac toilet i think .what happens some times when flushing soilds it keeps running don,t go to green light. during this i'll fill the bowl half way with water than flush while the pump is still pumping it takes awhile to go down but green light comes on.is there a pressure switch that tells the pump to stop ? any thoughts would be appreciated.
thanks bob,linda and missy
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Old 05-14-2016, 09:21 AM   #2
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There is a vacuum switch that shuts off the pump.

When flushing solids, hold the pedal down 3 to 4 seconds. That may help.

There are 4 duck bill (joker) valve in the pump. They work as check valves to build and hold the vacuum.

With time, they can start to fail. That can cause the extended pump run times.

Try the extra time on the flush to see if it works out. It give the solids time to clear thru the pump and valves.
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Old 05-15-2016, 10:11 AM   #3
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When you flush, make sure you hold the pedal down for 3 seconds. The pump will run for 20 to 30 seconds after you release the pedal in order to build up pressure for the next flush and the light will turn green again. Never flush unless the light is green. If the pump continuously runs, you have a leak somewhere. The first place to look is the valve in the bottome of the toilet, make sure there are no little pieces of toilet paper that are keeping it from sealing completely. You can hold the pedal down and gently run a toilet brush around the edge of the hole to make sure there is no debris on the seal. If it still will not build pressure and turn the light to green within 30 seconds, you will have to look for a leak elsewhere in the system. For the most part they are pretty reliable. Ours is three years old and working perfectly every day.
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Old 05-15-2016, 03:27 PM   #4
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thanks for reply no leaks,and it don't do it all the time and it holds pressure.
thanks again bob,linda & missy
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Old 05-15-2016, 07:14 PM   #5
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One thing I haven't seen mentioned. When you go to release the foot valve, don't do it slowly. Release it and let it snap back up.
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Old 05-17-2016, 07:08 AM   #6
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Brian, I think it even talks about letting it sbap back in the manual, correct?
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Old 05-17-2016, 08:26 AM   #7
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Yes sir, that's where I read it. I was doing it wrong at first and sometimes the pump would just keep running. Since I started doing that no problems.
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