Overfilling cistern - floating mechanism not halting inlet

[Newbie101]

Hi everyone,

First time poster, go easy on me!

My toilet cistern seems to be overfilling. It's a narrow plastic cistern (not important I imagine) and thankfully the overflow pipe is doing its job. The floating mechanism is working in that it's moving up and down, though it has a lot of limescale on it. In my attempt to make sure it was moving freely and was free from big lumps of scale, the overfilling seems to be happening even quicker than before. The current cistern was put in at a cost of £400 to my elderly partner. I believe a complete replacement was made instead of the flush mechanism being replaced. But I wasn't around at the time. So, I'm stuck with this which I have a horrid feeling isn't standard. I'd be happy to buy a new mechanism and install it, but not sure what size to look for.

Is this what is required? Has anyone a solution that maybe wouldn't require a new mechanism?

I've attached some photos of the current system in case it helps. (In case you notice some odd plumbing outside the cistern - there is an electric bidet attachment so the mains water is split into two. This has been in place for exactly a year without any problems. I don't believe the current problem is related to the bidet) I would be grateful for any advice.

Thanks

 

[Deleted member 120897]

It’ll likely be the washer, but that’s not a valve I’ve seen before. Unless anyone else knows the make and model, it’s easy enough to replace - side entry float valve.

 

[RayW]

It may be a FlushDaddy ... Flush Daddy Side Entry Inlet Valve Replacement Diaphragm Washer Rubber Seal ONLY | eBay - https://www.ebay.co.uk/itm/254186232564?hash=item3b2eae1af4:g:M-MAAOSw6sdcoiNh

 

[Newbie101]

Thank you both for your input. And RayW, wow that's exactly the model! I think you've both hit the nail on the head as there was a drip coming from around that area until I started testing it. The drip at the font of that washer section has visibly gone since, but the overflow is worse so perhaps it's just lest visible than before.

A new complete valve is £10 delivered, and the washer is a fiver delivered. I assume at this point you'd just suggest replacing the valve?

 

[RayW]

Yes ,splash out £10. . .