A Grantham fire crew were called out in the early hours of the morning only to find a faulty carbon monoxide alarm.
The alarm was sounding at Gorse Road, Grantham, and the crew attended at 2.30am. The crew used a gas monitor and found no gas.
A spokesman for the fire service said: “The alarm was caused by a defective carbon monoxide alarm. Please make sure you test your smoke and gas alarms regularly.”