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prima f40s burning badly of flaring?

hi my prima f40 has been playing up with the infamous not staying alight and clicking on and off .
I changed the 3 caps and great it worked for a week but now back as it was and the burner seems to be buring unevenly, kind of pulsing, any ideas out there?
carlos, May 2010
pcb or hole in the flue. gas safe engineer required to carry out any work on any boiler
read the text below at the bottom of this site

attempting repairs can be dangerous.
in many instances work should only be undertaken by a qualified professional.

JOB, May 2010
fan is not working corectly may need changing check pipes from fan may be split cut off 25mm and reatach

steve b&h heating, May 2010
link Click here to see other fixes for Prima F40S.