Why Is My Furnace Blowing Cold Air
It’s not much fun to expect warm air to blow from your registers only to get a blast of cold air. There are several things that can cause this, some of which you can fix yourself and others that need to be resolved by a professional. Incorrect Thermostat Settings Make sure the fan setting on your thermostat is set to AUTO and not ON. When it’s set to AUTO, the fan will only run when the furnace is on. When it’s set to ON, the fan will run constantly. This results in cold air blowing when the furnace is off. Also, check that it’s set to HEAT and not COOL. Overheated Furnace You’ll know your furnace is overheated if it blows warm air before blowing cool air, and then shuts off altogether. When your furnace overheats, the fan limit switch shuts off the burners. The most common reason for this is a dirty air filter. If the filter isn’t the problem, make sure all your supply vents are open. Pilot Light Is Out Older furnaces have a pilot light that’s always lit. A gust of wind can cause the pilot light to be extinguished. If you know what you’re doing,...
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