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johnstone starley j25-32, why does burner only burn half length?

Burner burns clean and full length until fan comes in. The flame then only burns for the first 1/3 to 1/2 of burner length.
any ideas?
thanks gas aid.

stue
January 2007
possible damage to your heat exchanger or flue is faulty and is causing vitiation stop using it !!!! get it checked!!!

dave
January 2007
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