Thanks for the replies and suggestions I tried the new firmware with and without old settings but still the same issue. I found a nice chap from Finland on Ebay who sold me a replacement control board for 50 dollars not the same as original but an adapted S1 control board. S3 works fine now at 250 Frequency it's pulling 420W at the plug and mining just over 500 GH/S with no X's and very low errors (0.01%) Nice little 400W heater in my bedsit so far no need for extra heater it's been down to 5 C outside but remains 23-25 C in the room.
Bitmain support was non-existent despite several emails asking for spares.
http://www.ebay.co.uk/itm/201460056095?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITHope this helps someone else with a problem board I have read it is possible to recover the board corruption using an adapter & software but this would be beyond my scope.