Why is My Heater Blowing Cold Air?

Your heating system is blowing cold air. It’s starting to feel as cold inside as it is outside. If your furnace is blowing cold air, you could have one of several HVAC problems:

Your heating system is blowing cold air. It’s starting to feel as cold inside as it is outside. If your filter that helps keep dust out of the inside of the system. If the air filter gets clogged, it can be difficult to draw enough air into the furnace to warm the house. The air coming out of the vents can feel luke-warm due to this lack of airflow. Check your air filter before calling for service. A clean air filter could be an easy, cheap fix.

The Pilot Light Is Out

Older furnaces have a continuously burning pilot light that ignites the gas when the furnace turns on. If the pilot light goes out, the furnace won’t heat up. When you have easy access to the pilot light, follow the instructions in your user’s manual to light it. If it won’t stay on or it’s difficult to get to, call for an HVAC professional to take a look.

The Flame Sensor Is Dirty

When your gas furnace turns on, the flame sensor sends out a current to detect if there’s heat coming from the flame. If it cannot detect heat within 10 seconds, it turns the furnace off. Its purpose is to prevent the build-up of gas when there’s an issue with the furnace burner igniting. It will try up to three times before locking out the system.

A quick way to determine if the flame sensor is problem is to turn the system off, then back on. If you feel hot air for a couple of seconds, followed by cold air, you may have a dirty flame sensor. Call for an HVAC professional to clean it.