Fire District 19 was dispatched by CC 911 to Lehigh Gorge Drive for a possible CO Call. Upon our arrival the homeowner was outside waiting our arrival. 1901 had command 1911 & 1955 responded to the scene when we arrived a crew of 2 firefighters with SCBA on entered the home with a gas meter and checked all rooms for potential readings. However no readings were found a nd cause was determined to be an out of date alarm. So the fire company cleared the residence and family was allowed to return to there home but the fire company recommended that they buy new CO alarm along with fire alarms. Fire company operated on scene for approximately 20 minutes and then were released.