After each snowstorm, make sure your exterior heating vents are clear.

Time: 15 minutes
Difficulty: Easy
Expertise: None
Frequency: After every heavy snowfall

Snow that falls, drifts or is shoveled can block the vents the supply air to and remove air from your furnace. When the sensors detect the lack of air, they shut off the furnace.

After every significant snowfall, check the heating intake and exhaust vents. Gently clear away any snow or ice.