push button toilet cistern,i have tryed to addjust valve to stop the terible noise,but no luck, is it possible to strip the system out to repair or do i have to replace the whole system.
Would be easier to diagnose if you could give a description of the noise. Is it whenthe thing is flushed or filling up. No you won't have to replace the whole thing at worse it will either be the flush valve or the inlet valve. At best its something else. Have you got a high pressure (mains) or low pressure (tank) feed and was the system yu bought for high or low pressure?
in the first instance i'd change the diphragm valve. easy to do, takes seconds and cost pennies, that may well solve it. if not then more info reqd re. type of noise and when it occurs, as has already been asked.
You appear to be claiming that you get the buzzing noise once the cistern is full. If you cannot see any water coming out of the fill valve then look for a cause elsewhere. Since it is mains fed you may have a leak in the mains pipe and the all plastic cistern is amplifying the noise.