Cheers Tony,
Think its a 20/80 RS flowmatic :?
The loud ticking happens when the hot water is turned on or the Heating starts up. Sure I saw the burners flicker to the timing of the ticking. The burners seem to dim slightly because of this.
Boiler losing most of pressure after 3/4days.
Also loud TICKING noise. Dont know if this is a Diaphragm fault. Water leaking from one of the valve stops underneath the boiler but I think its also leaking from above the valve stops. do I have a big problem?