Concealed Cistern - Very Slow to Fill

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This concealed cistern has just started to fill very slowly - really just a drizzle out of the back of the valve assembly on the right (which I think should flow onto the plastic tray underneath). Problem is that access is very tight, there’s an opening just big enough to get a hand in and the top of the unit it’s in is fixed - on further inspection, I think the manufacturer is Fluidmaster. There doesn’t appear to be an external stop cock for it, and the other water flow/pressure in the bathroom is fine.

Any suggestions as to where I should start in trying to sort it?

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After looking, it seems it’s a Fluidmaster. Is this likely a failed seal in the valve?
 
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It will probably be the washer/diaphragm that's at issue, may be easier to just replace the valve though unless you can get the old one out and see which one is needed.

To get the fill valve out you need to unclip the flush valve first. Then you will need access to the side where the supply is to remove and replace.

Are you in a hard water area?
 
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Thanks, there is quite a bit of limescale in there. Access is very tight, I was wondering how you’re supposed to get a hand in there.
 
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Thanks - will try to correctly identify the manufacturer before I find I can’t buy a replacement...
 
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New diaphragm washer bought, problem solved - thanks all very much.
 
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