7 Reasons Why Your Furnace Is Blowing Cold Air And How To Fix It

There may be a problem with the flame detector, gas supply, air filter, pilot light, or condensate lines if your furnace is pumping chilly air into your house. Many of these problems can be quickly fixed on your own by disinfecting or replacing gas furnace parts. Let’s talk about the numerous methods by which you might be able to handle these problems on your own.

Causes of Your Furnace’s Lack of Warm Air Production

1. Damage to the Pilot Light

It could be a good idea to make sure the pilot light on your gas system is operational if your furnace is blowing cold air. Your gas furnace’s pilot light is intended to start the burners so that heat can be produced by the appliance. On older gas furnaces, problems with the pilot light are frequent. To relight the pilot, we advise using the instruction manual that was included with your furnace.

Locate the Reset Toggle and Pilot Light Assembly

Locating the pilot assembly and its reset toggle is the first step to take if you want to relight the pilot light on your own. The reset toggle is typically found close to the furnace’s base. If you are having trouble locating the pilot light assembly and reset switch, please consult your instruction kit. Locate the reset toggle, then turn it to the off position to turn the gas off.

The Reset Switch Should Be Turned On

To give extra gas time to leave the furnace’s chamber before turning the reset switch to the On position, we advise waiting a few minutes. To ensure that gas can be delivered to the pilot light, turn the reset toggle to the Pilot setting next. Locate the reset button on your furnace and hold it down while lighting a match in front of the pilot light after you’ve modified this setting. The pilot light will start to develop a flame, which you can see. Release the reset button once you’ve managed to ignite a flame. Congratulations! Your furnace should now turn on to heat your home now that you have successfully re-lit the pilot light.

2. Dirt & Grime on the Flame Sensor

Some gas furnace models don’t use a pilot light to start the heating process. Flame detectors or sensors see the only means by which a heating cycle can be successfully completed in furnaces without pilot lights. You will soon lose heat if your flame detector is covered in dust, filth, or grime, and your furnace will start blowing chilly air. The flame sensor in your furnace can be easily cleaned to resolve this problem. You might also count on a team of HVAC professionals to clean the flame detector and restart the heating system.

3. Airflow Is Limited by the Air Filter

Incoming air from your gas furnace will be obstructed if the air filter in your furnace is covered in dirt, grime, or soot. Long heating cycles and overheating problems are typical indicators of filthy air filters. Your heater will circulate chilly air throughout your home as a result of the typical overheating problem. It is advisable to change the polluted air filter with a fresh one to restore the flow of warm air in your home. Your gas furnace will no longer overheat since the new air filter won’t restrict airflow.

4. Low Gas Supply in the House

If your heater is spewing chilly air, there may be a serious problem with your home’s gas supply line. If your furnace doesn’t get enough gas to complete its usual heating operation, it is built to shut off. Sadly, there is no quick cure for this problem on your own. We advise hiring a qualified HVAC expert to handle gas furnace repairs.

5. Condensate Lines are Blocked in the Furnace Lines

Have you observed that your home’s furnace is not operating properly? Modern high-tech furnaces are designed with condensate drain lines that help with moisture removal. The burners may go out if there is a clog in the condensate lines, which would result in the furnace blowing chilly air into your house.

6. Damage Has Been Done to Your Ductwork

Your home’s ductwork may have gaps and cracks that are causing the furnace to blast cold air. These varying sizes of apertures allow cold attic air to enter the air ducts. Even if your furnace is blowing warm air and is operating properly, it may have leaks by the time the air reaches your vents.

7. On Rather Than Auto Is Selected on the Thermostat

It is highly recommended to verify that your home’s thermostat is set to Auto if your heater is spewing cold air. Your furnace will run nonstop throughout the day even if it is not producing heat if your thermostat is set to the On position. To guarantee that the gas furnace in your home will only operate during the regular heating process, simply change this thermostat setting to the Auto channel.