Amana Furance

[bwcalder]

For the last week I have been having problems with my furance. For some reason it keeps going into external lockout mode (figured this out based on the red light blinking and which diagonistic code that represented). I have had a service man out to look at it and he cleaned the burners and the flame sensor. The problem kept happening. Would lockout about every 12 hours. The Service guy is going to order a new flame sensor, but he isnt sure if that will fix the problem (plus he cant find the part anywhere around here in chicago). He also mentioned replacing the control board if that part doesnt work. Now the kicker is since monday, i havent had the problem anymore. It hasnt gone into lockout. Anyone have any thougths what could be causing the problem?

Thanks!!

[jnaas2]

What code was it flashing