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What happens when you restart? Does the draft fan run? what are you getting for a flash sequence on the control board?
Ok, that's an open limit circuit error and a rollout switch (see attached pic for typical) could be causing it. Look for one attached to the burner box.
Small button between the 2 wires. If you push it and it clicks you have reset it. If it doesn't click it probably wasn't tripped
Then you either have an open limit or possibly a bad connection in the limit circuit. Do you have a multi-meter?
Ok, then trace out the wires connected to the rollout switch. You should come to the hi limit (see attached for typical). Check for continuity across the switch terminals. If you have continuity then trace both ends of the circuit back to where it connects to the board and test continuity there. If you have continuity at the board and are still getting an open limit error then the board is suspect. Check all the connections along that limit circuit.