Toilet won't stop filling plumbing advice

Toilet won't stop filling Hi All,

I need a assistance. I have toilet with buttons instead of a handle.

We had issues before we it would not stop filling and just pressing the button a few times would fix that.

That stopped working and then upon inspection the mechanism was covered in black gunk.

This was cleaned and the toilet still didn't stop. I then filled the cistern with warm water and citric acid to see if that would clear any scale that may have built up. The toilet worked for a few days and now will not stop filling unless we manually press the plunger down.

Any advice would be helpful. I am not a plumber.




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