At 1943 hours, Sussex EOC alerted Station 85 for a CO detector activation in the Hunters Mill development off of Rt. 9 in Harbeson. Engine-Tanker 85-2 and Ladder 85 responded. Captain Cranford (85-21) arrived on scene and established the command. Crews check the interior of the home and found no reportable readings. Command placed the scene under control and cleared all units. Units responding, 85-21, 85-8, 85-2, Ladder 85, DSFP.