I have a trane xl80 model tud080k93640 furnace, the circuit board is going out is it easy for me to fix? How much does on cost typicly? Can I do the work on it?

Yes if you have the part and ability
Cost depends on where you buy it
I don`t know,

Now,how do you know its going out?

yes if you have the part and ability
cost depends on where you buy it
I don`t know,,

now,how do you know its going out?

While you're at it define "going out". Did it grab it's keys and wallet and say "See ya later. I'm stepping out to the pub for a pint". :D

:),:)

Well a guy on here sugested it was going out. Here is my problem. At the moment the furnace is working great no problems for 2 days now. But before this, I turned the heat up to 66 it was at 62 and I could hear the burner kick on but no fan to blow the hot air, I went down stairs and the red light blinking 4 times said thermal protection device open. I turned off the furnace at the furnace and up stairs at the thermostat. And I then turned the thermostat to fan on. The fan ran great for 20 or so min then I decided to turn the furnace back to heat and it kicked on. So a guy said on hear its definitely the circuit board going out. Don't know if that's true but that is the best answer so far. I would love it if someone could exsplain it to me.