Gas Furnace Is Blowing Cold Air: Troubleshooting the Problem

Construction & Contractors Blog

Perhaps the only thing worse than a nonworking furnace on a cold winter day is a furnace that is pumping your home full of cold air. The good news is, if your gas furnace is blowing out cold air, you may be able to correct this problem yourself while avoiding an expensive professional repair. In order to troubleshoot this problem, simply follow the steps outlined below.

Step 1: Check The Pilot Light

If your home is equipped with an older model gas furnace (more than 10 years old), there is a good chance that your system still relies on a pilot light to ignite the natural gas that fuels the system. If your furnace is a new model, it should make use of an electric ignition and you can simply skip to the next step in the troubleshooting process.

If you have determined that your furnace does in fact have a pilot light, the first thing you will need to do is to enure this pilot light is still lit. This can be done by removing the access panel on the front of your furnace and looking towards the back of the unit to see if there is a flame visible. If the pilot light has gone out, you will need to relight the pilot by following the instructions on the inside of your access panel.

Step 2: Check Your Gas Valve

If you have recently been cleaning around your furnace or had some home repairs done, there is a chance that the valve on you gas supply line was turned off. In this situation, your furnace will not be getting the gas it needs to effectively produce heat.

In order to ensure your gas supply valve is turned on, begin by locating the valve closest to your furnace. If the valve is currently parallel to the gas line, the valve is on and gas is being supplied to the unit. However, if the valve is turned at a 90 degree angle, the valve is closed and will need to be turned counterclockwise until the valve is parallel with the gas line in order to restore the flow of gas.

Step 3: Bleed Your Gas Line

If it has been a while since your furnace was last turned on, there is a chance that air has made its way into your gas line and is preventing the delivery of fuel to the system. In order to correct this problem, you will need to bleed the gas line. This should only be done in a well ventilated area in order to prevent the buildup of potentially dangerous fumes.

Once you have ensured proper air circulation around your gas line, you will need to use a pair of pliers or grips to remove the line from the main connection. Allow the gas line to remain disconnected until you are able to smell the scent of gas. Once gas is flowing freely from the line, quickly reconnect the gas line and allow any gas in the air to dissipate before attempting to relight you furnace.

If you furnace is still blowing cold air after performing all three of the steps above, you may be dealing with a broken outdoor thermostat or heating element. Both of these issues will require the services of a professional HVAC contractor (such as Kohl Heating & Air Conditioning).

Share

5 March 2015

Protecting Your Home During Construction

During construction, parts of your home might be completely torn apart, which is why it is crucial to do what you can to protect your place. One of the best tips I've ever heard in terms of preparing for a renovation is meeting with your contractor to discuss how the job will impact your daily life. I wanted to make a blog all about protecting your home and family during construction, because the process is usually more involved than most people realize. Read these helpful posts to make your next construction project simple, clean, and safe. It could help you to make your house feel like a home, even during the hard times.