Hi emanno thanks for your help yesterday, have now removed the st- from the bell-box,texecom which stopped the strobe but on re-connection the strobe started flashing.re.connected the wire back at the alarm and tried resetting to no avail,that was quite late last night so i left it,this morning it's back to one single flash per eight seconds.I have heard of water ingress causing faults on bell-boxes is this a possible cause and do i need a replacement.
Winston Blight, February 2014