View the thread, titled "Good evening I’m a gas man from Yorkshire. Just need some advice on a wall hung concealed toilet. It’s not my specialty but I need some help" which is posted in The Welcome Wagon :) on UK Plumbers Forums.
Looks like either flush pipe has a hole / split in it or the top washer has gone either way new frame / major access required
Official Sponsors of Plumbers Talk
Reply to the thread, titled "Good evening I’m a gas man from Yorkshire. Just need some advice on a wall hung concealed toilet. It’s not my specialty but I need some help" which is posted in The Welcome Wagon :) on Plumbers Forums.