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error code 31= pressure, draft safe gaurd, auxillary-limit (when used) or blocked vent shut off (when used) switch did not close when opened.
error code 13= limit or flame roll out switch
I really believe it is the 31 becasue there is a longer wait time after the 1 long blink.... It seems like the long blink goes with the three short ones first...
One the 31 code there are a ton of things listed... I am assuming you will know what they are and if not i can type them to you as well
ok, if it is an error code 31 for pressure switch, this is the circular switch with a 1/4 inch tube going to it, first thing, is this a 80 or 90% eff. furnace, easy to tell this is if it has PVC or metal venting.
If it is PVC venting there will also be a drain that may be plugged.
Lets find out what furnace you have and go from there
I am assuming it is the 80% it does have the white pvc... I saw the round softball size silver switch thing with rubber hoses coming out out it... I squeezed it all over and all of a sudden the gas lite up and the light is now solid!!! was it plugged up and how to I fix it "really fix it" It is blowing hot air now though!!!
ok, check where it hooks up to the furnace, take the rubber tube off and stick a paper clip in there, sometimes some crud builds up there...if there isn't much there you might need to replace the switch. they aren't very expensive if you do need to change it.
Don't try to clean it while it is running, wait about 20 minutes after it shuts down