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What are you getting for a blink sequence on the control board?
The behavior you describe would be indicative of a 13 code (open limit circuit) not a 31 code (open draft pressure switch). Are you sure you have a 31 code (a 31 would be 3 short 1 long blink) short blinks are first digit
I'm not sure what that means. If you aren't at the furnace to check then get back to me when you're onsite. If you do indeed have a 13 code the first thing to check is the filter. A dirty filter can cause a 13 code. You can try a reset by turning off the power to unit. wait a minute then turn it back on.
Ok, that's odd behavior for an open draft switch. Have you tried cycling the power off then back on?
You could have a bad board or possibly more than 1 problem. Check the limit for continuity and try resetting the rollout switch(es).
No that's the blower door switch. The limit has 2 wires connected is inserted into the heat exchanger and is in the same circuit as the rollout. You'll only see the outside of the switch with the 2 leads connected
Do you have any more questions?