Cistern Water Suppy Issue

[Plumb37]

Hi,

I’ve just replaced my WC cistern fill valve (bottom feed) with a brand new one from Toolstation as the cistern wasn’t filling up. The water feed to the cistern has an isolating valve which seems to be working fine.

After fitting the new valve the cistern filled up and flushed 4/5 times as it should do but then just stopped filling up reverting back to the original problem.

Before fitting the new fill valve I changed the washer in the original one and the same thing happened.

This makes me think there must be an issue with the water supply coming in but I have never seen a cistern fill correctly 4/5 times and then stop filling.

Any advice would be really appreciated.
Gary

 

[Deleted member 96286]

As I said above, these low pressure issues are normally caused by air and I've had to clear these many times, number 2 is a half stuck gate valve.