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M
Thanks all. I replaced the washer and there is no longer a humming noise when the toilet is flushed.
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M
See post by @HERTS P&D
Isolate water to cistern and access to the washer is to undo the nut at the end with the white piston protruding out
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M
Yes had it plenty of times when I was back on plumbing and sounds like the float valve (side entry valve) requires a new washer