weak toilet flush

[Boilersuit]

Try pouring a bucket where the pan hole is eg the cistern / siphon goes on

Did this a good few times. The water goes through like you'd expect

 

[ShaunCorbs]

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

 

[Boilersuit]

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

OK did that. Not sure what I'm looking for tbh.
The water comes into the bowl in a fairly weak stream, but that could be because I'm just pouring a bucket

 

[Chuck]

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.

 

[Boilersuit]

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.

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.

 

[Ric2013]

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.