February 16, 2021
Furnace Repair

Winters in Lincoln, IL, are long and cold. Waking up to a furnace that’s blowing cold air is an unpleasant surprise. There are several reasons why your heater may do this. If you notice that your furnace is blowing cold air, the first thing to do is check the thermostat. If it’s properly set to the heating function, one of these three issues may be the cause of the issue.

1. Pilot or Ignition Problem

Older furnaces have pilot lights that must always be on for the furnace to heat. If the pilot goes out, the furnace will blow cold air. You may be able to relight the pilot. If it keeps going out, the appliance needs repairs. An electronic ignition problem or an issue with the computerized controls in a new furnace could also result in cold air blowing from your house’s vents.

2. Overheated Heat Exchanger

It might seem unusual, but an overheated furnace could blow cold air. The first thing to do is check the air filter. If it’s dirty, replace it. Our technicians always do this during your annual heating system maintenance visit. A dirty air filter reduces airflow through the combustion chamber, which could cause the heat exchanger to overheat. After time, this could cause the heat exchanger to crack.

3. Faulty Thermocouple or Flame Sensor

A furnace’s thermocouple is a sensor that operates the ignition and gas valve. If it fails, the furnace won’t be able to burn the gas. This will cause it to blow cold air. The flame sensor may become coated with grime. If this happens, its safety system will turn off the burner. During a maintenance visit, we’ll clean the sensor.

At Quick Comfort, we’re ready to provide you with precise furnace repairs. Our skilled technicians also offer heating and cooling repairs, maintenance and installation services. Our indoor air quality and air purification systems will keep your home’s air healthy and comfortable. For more information on why your furnace is blowing cold air, get in touch with us at Quick Comfort today.

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