I had a replacement toilet installed 3 years ago - it's a 'bog standard' (sorry!) contract style job with no name from Graham's Plumbing Supplies (a Jewson company). It's dual flush with delayed fill. For some reason the fill is often not delayed so the water starts running into the cistern before the flush valve has fallen to the closed position, so the incoming water goes straight down the pan, managing to keep the flush valve from closing. Before I strip it all down to investigate has anyone here come across this problem and if so what's the cure? From my research the valves appear to be Altech - A207 Fill Valve and B208 Flush Valve. How is the delay achieved?
I see Toolstation sell a delayed fill valve for £9.98 so it's no hardship to replace it if necessary.
TOJ.