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Is your filter clean? A dirty filter can inhibit air flow and cause this error. Also check the rollout out switches which are just outside the burner chamber (see attached for typical). Turn the power off then push the small reset button between the 2 wires. If it clicks you have reset it. If it doesn't click then it isn't tripped. Also check all the connections along the lead (from end to end) that connects to the rollout. If none of that works you'l probably have to call in a pro
You could have a bad connection or possibly a bad limit. You need to check the connections on the lead that's connected to the rollout from end to end. The limit should be in that circuit. If you have a meter you can check for continuity across the 2 terminals on the limit.
OK, also check continuity along this limit circuit where both ends connect to the board. It might save some time checking connections.