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no main burner- Glow worm economy + 80F?

Glow worm economy plus 80F. Fan problem fixed- fan now turns. pilot spark present. pilot light eventually lights but flame very small and goes out- during this time the spark keeps sparking. - No main burner. Can anyone help.
Note circuit board "pilot/ PCB Proved" led not lit- the three other leds are lit.
kev, September 2011
change air pressure switch

ltd, September 2011