Cistern fill valve jams after one flush...

18 Jan 2021
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United Kingdom
I took it out of the cistern to check it and connected it to the shower line just to test with water.

When I turn the water on the water comes out of the very bottom white pipe like normal.
When I lift up the blue bit (the part that would float once the toilet was full) then the water stops - also normal.
When I let the float fall, the water doesnt flow anymore, the valve part on the right is stuck. Ive tried taking it apart, cleaning it and putting it back, but it does the same every time - works once, then doesnt work again.

Am I missing something obvious or is it just worn out?

Thanks! :)
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