A carbon monoxide alarm triggered a police and fire response at the Mountain Avenue store in Hackettstown around 5:10 a.m. Wednesday, April 6, according to Hackettstown police.
A 21-year-old worker from Manfield Township complained of a headache and nausea, but refused medical treatment, police said.
A faulty HVAC unit was the source of the fumes, the fire department found. The unit was shut down and the building was ventilated.
The location was closed for about an hour but has since reopened.
Click here to follow Daily Voice Garfield-Lodi and receive free news updates.