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weak toilet flush

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I've tried cleaning out the jet channel that goes from the cistern into the toilet pan (there's only one). It seemed fine, not a huge amount of sediment coming out of it & no problem getting a wire to pass all the way through it.

I've re-installed the syphon again.

Nothing's working! At the end of my tether here tbh, might just call a professional ¯\(ツ)/¯ thanks for all the help guys!
 
Hope it's ok to resurrect this thread!
I left this be for a while cos of life commitments etc. But I'm back at it now.

I noticed the syphon pump actually pulls in water as it is flushed. You can see it gurgling up,see the video.
I can't figure out why it does this, but it definitely is part of the problem as it means the water doesn't get pushed strongly up & over down the flush pipe into the bowl.

Just a recap this is my THIRD new syphon that flushes weakly like this, it's the more expensive fluid master one.
 

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  • VID_20211101_155721.mp4
    37.6 MB
In a word,,, Rubbish.
The water should move far quicker than that.
How far above the bottom of the cistern is syphon?

That demonstration is giving the impression that the flush pipe is filling up and not allowing the syphoned water to pick up speed, assuming there is clearance under the syphon to allow the water to get into it.
 
snowhead said:
In a word,,, Rubbish.
The water should move far quicker than that.
How far above the bottom of the cistern is syphon?

That demonstration is giving the impression that the flush pipe is filling up and not allowing the syphoned water to pick up speed, assuming there is clearance under the syphon to allow the water to get into it.
Click to expand...
It's about a quarter of an inch above the bottom of the cistern right now (and in that video). It's an adjustable-height syphon so I have tried it at a few different heights. Does the same whatever height I set it to.
 
Cut one thread off the bottom of the siphon worth a try
 
Try pouring a bucket where the pan hole is eg the cistern / siphon goes on
 
Ok remove the siphon from the carrier eg undo the red clip and lift the right half off and pour a bucket down the tube
 
This is turning into quite a saga.

Have you tried taking the cistern outside and testing the siphon's operation with a bucket under it instead of the pan? This would at least tell you whether the issue was with the cistern, which I think is less likely after you've tried three siphons, or blocked channel(s) in the pan, which is where my money is.
 
Chuck said:
This is turning into quite a saga.

Have you tried taking the cistern outside and testing the siphon's operation with a bucket under it instead of the pan? This would at least tell you whether the issue was with the cistern, which I think is less likely after you've tried three siphons, or blocked channel(s) in the pan, which is where my money is.
Click to expand...
I'm so sick of this toilet by now!

So I haven't tried that exact thing, I'll give that a shot soon & report back.
I'm starting to think it could be blocked channels too, but also have been poking at them a lot & not noticed any major blockage.
 
1/4" from the bottom of the cistern sounds a tad tight, but not excessive. Just to make sure though... wedge a pencil between the cistern and the underside of the siphon and try flushing again. I'd just want to be sure the vacuum of the siphon isn't pulling the siphon up against the cistern floor.
 
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