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Need full model number please
Does blower run all the time?
Do you have flash code on the furnace board. Russ
That number does not come can you take picture and attach with next reply. If you look at serial number it will tell you year made. First two number are the second two are year. Russ
Anything written on the furnace that would help. 20 years we can still get a manual and parts
Does anything work. Any lights on board. Russ
Anything on the furnace will help. Does diagnostic lights flash. Have you checked fuse on the board. Russ
I will opt out so another expert can answer.