Advice needed on replacing syphon on concealed cistern with back to wall pan

[cooa99]

Hi all,
our bathroom flush is on its way out and looks like the diaphragm is split.

unfortunately we have a back to wall pan with the water cistern behind the Tiled plasterboard wall. My only access to the cistern in only at the top where we have a shelve.

It appears that I will need to unscrew the toilet syphone from underneath the completely hidden part of the cistern which I cant get to. which is a bit silly by design for a concealed system. This might mean having to completely removing the Tiles and plasterboard in front of the cistern and maybe even the toilet pan as well

My questions are :-

1) Cant I really change the syphon from the top?. The toilet was done in early 80s as part of the house build so not sure how I can tell if can be removed without access to base of cistern
2) Assuming (1) is impossible these are old tiles cream tiles which the colour or maybe even the size no longer exist. My plan was to try and remove the tiles off the plasterboard and soak in water for a long period of time hoping that will removed the adheisives so I can reuse. If this fails please what are my best options for creating a decent finish


Thanks

Carlton

 

[just pumps]

With some syphons there can be a nut to undo and the part you want to get to then lifts out, others have a pin to release.

 

[dreadnoughtheating]

A couple photos might help?

Concealed cisterns behind any decorative surface are the very invention of the devil. ALWAYS installed by that mysterious 'trade' who call themselves Bathroom Fitters, and have no concept that future maintenance will be needed. Happy new year. Pass me the tylenol.

 

[just pumps]

Just be sure to isolated the water to the cistern first.

 

[dilalio]

What type of syphon is it?
Can you not remove the pan and get to the backnut from there?

 

[cooa99]

Here are 2 pics. There are no Isolation valve on the water feed.

 

[dilalio]

Can't see from your photo but tie the ball float up (so it doesn't drop and start filling the cistern again) and flush the mechanism.

Then get a torch and have a good look down and around to see if the valve is one of these...
http://www.fluidmasteruk.com/our-pr...dmasterr-pro-universal-dual-flush-syphon.html

If it is, you're in luck. There are a couple of other brands that utilise an 'outlet leg' which allows top level removal of the syphon!

You're going to have to find out how to isolate the wc supply be it tank or mains fed, so I'd look into that first.

 

[dreadnoughtheating]

Cannot say if this work for you or not as I have not tried one.... but see here, Plumbase stock them, and if you watch the video, it claims you do not need to disturb the flush pipe.

https://www.plumbase.co.uk/wirquin-macdee-quickfit-100007814-3574181

video clip

looks like the push button may be the difficult issue to consider