Loud humming noise and vibration when toilet is flushed

[Mr M]

When I flush my toilet, there is a loud humming noise from what I initially thought was coming from inside the cistern. I lifted the cistern lid off and when the toilet is re-filling with water, the noise is at its loudest when I touch (I think it’s called) the side entryfill valve. You can also feel the side entry fill valve vibrating until the toilet has finished re-filling. I then noticed that whilst the toilet is re-filling, the cold water supply pipework to the toilet which is all surface fixed, also vibrates when I touch it.

The pipework is all in copper and is fed from downstairs. It pops up through the bathroom floor and from there, it tees-off left to the bath and right to the wash hand basin and this pipework then carries on to feed the toilet. All of that cold water supply pipework in the bathroom can be felt to vibrate when the toilet is re-filling but if I turn the wash hand basin cold tap on, the noise and vibration stops completely. Turn the tap back off and the noise and vibration starts up again. Same if I turn the bath cold tap on and then off. The noise and vibration stop and then starts up again, until the toilet stops filling.

Has anyone come across a similar issue before and is there anything I can try to fix this before I call in reinforcements?

Thanks in advance for any responses received.

 

[CountryFan]

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

 

[Mr M]

Thanks for your quick response.

Are all of these washers the same type and size?

Also, I'd like to try and have a go at fixing this problem myself before having to call someone in. How do I access the washer?

The image below looks very similar to the side entry flush valve that's in my cistern, if it helps in your description of where the washer is located within it.

 

[HERTS P&D]

See below:

Ballvalve Washer Delchem

www.toolstation.com

Andy

 

[CountryFan]

Are all of these washers the same type and size?

See post by @HERTS P&D

Also, I'd like to try and have a go at fixing this problem myself before having to call someone in. How do I access the washer?

Isolate water to cistern and access to the washer is to undo the nut at the end with the white piston protruding out

 

[Mr M]

Thanks all. I replaced the washer and there is no longer a humming noise when the toilet is flushed.