Aircraft Equipment Problem Less Severe
Flight Crew Rejected Takeoff
Aircraft
[We] received erroneous takeoff configuration warning when thrust levers advanced for takeoff. Immediately discontinued takeoff at approximately 30 KIAS and taxied clear of runway. Configuration appeared correct - flaps set at 1; LED's set for takeoff; stab trim set at 6.06; speed brake lever down; parking brake off. [We] recycled flap lever; speed brake lever; and trim. Visually inspected spoiler position to confirm spoilers stowed. Momentarily advanced thrust levers to ensure takeoff configuration horn and lights indicating proper configuration. Received no further warnings and all indications were normal during second takeoff attempt.
B737-800 pilot reports a low speed reject for a takeoff warning horn. All inputs to the takeoff warning system are checked and cycled and no anomalies are noted. The second takeoff attempt is successful.