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Ravenheat boiler not staying lite?

I have a Ravenheat CSI Primary A condensing boiler it goes through the start proccess main burner comes in for 5-6 seconds then the boiler switchs off I have replaced the overheat stat and the airflow switch but the boiler is still the same.
Jeff Hilditch, July 2010
Flame rectification.

Check for decent earth connection to the boiler and correct polarity between L & N.
Check lead for ignition/rectification in good condition and not 'trapped'.
Also check the condense waste system is clear.

Carefree, July 2010
link Click here to see other fixes for Ravenheat.