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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

home Fix label Heating label_important Home Heating Systemsdone

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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home Fix label Heating label_important Home Heating Systems

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

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

I can answer this question ...

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

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