York diamond 90 pilot not staying lit

Have him use some light sand paper or grit cloth on the flame sensor. Clean it up and it will probably work like a charm. (I have that same furnace)
 
fixed it!!

thanks so much!!..Vent was clogged with snow!!.. cleared it out.. and wallah!!... Why can't all repairs be this easy!!!!!???...The whole damn city is under 3 feet of snow!!
 
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