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Vacuuflush toilet won’t flush

Old 10-18-2020, 08:53 AM
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Default Vacuuflush toilet won’t flush

Help help help help
pan-pan. Pan-pan. Pan-pan


my vaccu-flush toilet won’t flush anymore

push the handle down and nothing
black water is backed up now

cant hear the pump try and make a vacuum.

of course my daughter (6 year old) decided to use it before me ...
Old 10-18-2020, 08:57 AM
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Check motor make sure it good, check joker valve make sure it open when it is suppose to.
Old 10-18-2020, 08:58 AM
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if the pump isn't running and there's no vacuum, the 3 most likely issues:
-issue w/power being supplied to the system...think fuses/breakers/wiring
-issue w/the vac switch...the vac switch turns the pump off when there is 'enough' vaccum...sometimes they go bad and need to be replaced...sometimes they just stick and tapping it or a light whack can unstick them
-issue w/the pump itself...the motors can fail and need replacement
Old 10-18-2020, 09:00 AM
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I pulled out the little spring switch for the “vacuum” and it runs when I pull it out (simulating no vacuum in tank)
that runs fine when I pull it

the macerater “works”

I got pumped out last weekend and barely used it
the tank looks 1/2 full now by using a flashlight
Old 10-18-2020, 11:27 AM
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many threads on vaccuflush

when is the last time you did maintenance on the system and replaced seals, valves, etc?

have you made sure there isn't an obvious clog? it might be gross but you might have to dive-in.

have you referenced the manual?

if motor running and pump can't re-charge the system, its probably a bad seal.

Last edited by mystery; 10-18-2020 at 11:39 AM.
Old 10-18-2020, 11:37 AM
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Six year old?? Probly too much paper. Remove hose at pump intake and OMG.....
Old 10-18-2020, 01:56 PM
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If motor is running but no vaccuum is forming, you may need to learn about rubber gloves and duck bill valves.
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Old 10-18-2020, 03:11 PM
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went through the same issue this past summer, learned a lot about vac u flush, duck bill valves is where you should start, take the hoses apart near the pump, you will find them, and the clog at the same time, replace the valves while you are in there. Find a drawing online and be sure to replace them in the same position.
Old 10-18-2020, 04:25 PM
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I might be missing something but definitely don’t start replacing duckbills.

first question: do you know if it’s building a vacuum or not when you don’t force the pump to turn on? If the answer is yes but it won’t flush, then it sounds like a clog between the bowl and head. If the answer is no then it sounds like a defective vac switch.
Old 10-18-2020, 04:38 PM
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As I type this I am in the process of replacing my joker valve, mine flush but water runs back into the bowl, it's open very hard and have no pliability.
Amazon sells a rebuilt kit, seals, O-ring, washers and joker valve for about $20, I think they are all interchangeable, Raritan, Jabsco and Groco.

PS: even if that's not the problem, I would replace those serviceable parts while I have it all apart.
Old 10-19-2020, 07:36 PM
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Originally Posted by chainsaw42 View Post
I might be missing something but definitely don’t start replacing duckbills.

first question: do you know if it’s building a vacuum or not when you don’t force the pump to turn on? If the answer is yes but it won’t flush, then it sounds like a clog between the bowl and head. If the answer is no then it sounds like a defective vac switch.
when it stopped working. The valve would open and nothing. Was NOT making vacuum.
Did not hear pump running after the toilet was flushed.
I hit the pump w my hand and had wife push lever. Nothing.
I let it sit and tried again and it worked. Fine
Old 10-19-2020, 11:20 PM
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Originally Posted by myyellas2k View Post
when it stopped working. The valve would open and nothing. Was NOT making vacuum.
Did not hear pump running after the toilet was flushed.
I hit the pump w my hand and had wife push lever. Nothing.
I let it sit and tried again and it worked. Fine
Ok. Pump not running. You will see a vacuum switch on top of the tank. Use a meter to test for voltage either side of the switch. 12.xV both sides means a possible pump motor problem. 12v only 1 side means a possibke vac switch problem. No 12v means a wiring problem back to the 12v feed switch.
Old 10-19-2020, 11:34 PM
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6 year old?

Too much paper, Kleenex, or baby wipe(s)?

There is really no describing the smell. Start at the vaccuum tank and work forward to the valves and pump - no point in clearing pump and valves if there are any wipes upstream. Dont ask how I learned.

Edit: if the pump was running but now trips the breaker and stops, the offending paper product has made it to the bellows. You'll still need to clear the vacuum tank upstream to keep from having to take things apart more than once.
Old 10-20-2020, 07:03 AM
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Originally Posted by Aliboy View Post
Ok. Pump not running. You will see a vacuum switch on top of the tank. Use a meter to test for voltage either side of the switch. 12.xV both sides means a possible pump motor problem. 12v only 1 side means a possibke vac switch problem. No 12v means a wiring problem back to the 12v feed switch.
Sounds like this is a fun “winter” project lol

Originally Posted by Darksails View Post
6 year old?

Too much paper, Kleenex, or baby wipe(s)?

There is really no describing the smell. Start at the vaccuum tank and work forward to the valves and pump - no point in clearing pump and valves if there are any wipes upstream. Dont ask how I learned.

Edit: if the pump was running but now trips the breaker and stops, the offending paper product has made it to the bellows. You'll still need to clear the vacuum tank upstream to keep from having to take things apart more than once.
she’s really really really really good with only
using a little bit of TP
she knows not to throw anything down there.
I don’t THINK it was clogged. I think the pump just stopped ..... sucking.
Must of gotten married in the last 2 weeks 😂
Old 10-20-2020, 08:21 AM
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sounds like vac switch. override it as you have already done and you should be able to empty the bowl for now...and then replace the switch.

as far as proactively rebuilding the system with duckbills...it can make sense because you can put a lot of clean water through the system when you do this proactively as well as pick a 'convenient' time to do the work as opposed to being forced to disassemble it when it is very dirty and you're on vacation. but honestly I have found the components to last years and years so I would not go overboard with this.
Old 10-20-2020, 10:29 AM
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Agree - get the pump running. This may require hot-wiring around the vacuum switch. Good news is that the pump can run dry for extended periods. Turn off the water supply and hold the pedal open and run a fish wire down the hose. If you are making vacuum prodding at the blockage will pop it out of there then you can run a lot of clean water through the system.

After that then you can go after the Bellows and duckbills service items.

As they say there are no plumbers at sea.

I keep a spare T style pump onboard and rebuild kits. If the shitter is broken the crew will mutiny on me, saving a trip with an hour of shit work is well worth it. Knowing how to not need to do that and muddle along until you are back to the dock is much nicer than the alternative.
Old 10-20-2020, 02:55 PM
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Replace vacuum switch.

If you give the tank a good whack and the pump starts, you know the vacuum switch is bad. Cheap and easy to replace too.....
Old 10-20-2020, 05:59 PM
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Originally Posted by Flying_Norseman View Post
Replace vacuum switch.

If you give the tank a good whack and the pump starts, you know the vacuum switch is bad. Cheap and easy to replace too.....
Where? the part I found was like $200 for it. Took the thing apart, cleaned up and started working again mostly flawlessly once I figured out the right gap setting. Good part of taking it apart is knowing that I just need to do a bit of digging to find the right microswitch instead of the switch assembly.
Old 10-20-2020, 06:14 PM
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Originally Posted by kwb74 View Post
Where? the part I found was like $200 for it. Took the thing apart, cleaned up and started working again mostly flawlessly once I figured out the right gap setting. Good part of taking it apart is knowing that I just need to do a bit of digging to find the right microswitch instead of the switch assembly.
$200,- in my world is very welcome. But I think I got the switch from Dometic for $20 something.
Old 10-20-2020, 08:05 PM
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Truth be told
I have absolutely no idea where to start

I see 2 “pumps”
one looks like the macerater which pumps but nothing exits (and I’m not about to try it )
and the other is another pump on the smaller tank

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