Is your home feeling colder than usual? If your furnace isn't blowing hot air like it used to, you may have a problem on your hands. Before you panic, check out some of the common causes and solutions for a furnace not heating properly. It may be a simple fix that doesn’t take much time or money.
The good news is that many times it's something minor that you may be able to fix without needing a degree in HVAC repair. Things like a dirty filter, ignition or pilot light issues, or thermostat problems are often easy things you can troubleshoot. Of course, sometimes it is a more serious issue involving the furnace itself or the venting system, in which case calling a pro is your best bet.
Either way, now you've got an idea of where to start. Grab your wrench and flashlight, and let's figure out why your furnace isn't blowing hot air so you can get back to being comfortable at home.
Common Causes Behind a Furnace Not Blowing Hot Air
If your furnace isn't blowing hot air, there are a few common issues that could be causing the problem. First, double-check your thermostat settings. Make sure it's set to "heat" setting and that everything is working properly. If the thermostat seems fine, it could be the battery that may require replacement.
A clogged air filter is also a frequent culprit. Replace your filter every 1-3 months to allow proper airflow. If the filter is blocked, your furnace can't heat the air and will shut off.
For gas furnaces, the issue could be with the ignition or gas valve. Built-up dirt and debris can cause the gas valve or igniter to malfunction, preventing the furnace from lighting. Have an HVAC technician like The AC Guy inspect and clean your furnace annually.
The problem could also lie with the burners or heat exchanger. If the burners are clogged or the heat exchanger is cracked, the furnace won't produce enough hot air. This is dangerous, so call a professional immediately.
Other possibilities include issues with the blower fan or motor, thermostat wiring, or condensate drain lines. It's best to schedule a furnace tune-up to have a technician fully evaluate the system, as they can troubleshoot, perform necessary repairs or maintenance, and get your furnace blowing hot air again so you can stay cozy all winter long.
Troubleshooting Tips for a Furnace Blowing Cold Air
If your furnace isn't blowing hot air, try these DIY tips before calling a professional.
Make sure your thermostat is set to "heat" and not "cool". Double-check that the temperature is set higher than the current room temperature, and if it's a programmable thermostat, ensure the schedule is set properly. Replace the batteries in your thermostat as well, since low batteries can cause the thermostat to malfunction.
In some cases, an outdated thermostat could be part of the problem. A smart thermostat gives you more control and the ability to diagnose issues. Many HVAC companies offer affordable smart thermostat installations.
Clogged Air Filter
A dirty air filter reduces airflow to your furnace, preventing it from heating your home effectively. Inspect and replace your air filter every few months or whenever you notice that the filter is not working properly. A clogged filter is an easy fix that can get your furnace blowing hot air again quickly.
Pilot Light or Ignition Issues
For gas furnaces, problems with the pilot light, thermocouple, or ignition system can prevent the burners from lighting properly. The pilot light may have gone out, or the thermocouple could be malfunctioning. Have an HVAC technician from The AC Guy inspect and, repair, or replace these components to restore proper heating.
Ductwork Issues
If your ductwork has significant leaks, holes, or disconnected joints, the hot air won't make it to your vents. Inspect your ducts for any visible damage or disconnections and seal them to improve heating efficiency.
A furnace that's not blowing hot air can often be remedied with some simple troubleshooting. However, for the safety and efficiency of your system, call in a professional if issues persist or you suspect a problem with the gas supply or furnace components. Regular maintenance from an HVAC technician is the best way to ensure your furnace operates properly all winter.
When to Call a Professional for Furnace Repairs
We know it can be frustrating when your furnace isn’t blowing hot air, but the good news is that many issues can be resolved by simple fixes. However, in some situations, it’s best to call in the professionals to handle the problem.
If you smell gas or suspect a dangerous leak, evacuate and call the gas company immediately. They are properly trained to handle emergency furnace repairs and ensure safety.
For complex electrical or mechanical issues, call an HVAC technician. They have the knowledge and skills to diagnose and fix problems with igniters, valves, blowers, and other furnace components. Attempting to repair these yourself could result in injury or cause further damage.
If you’re unsure about how to troubleshoot the system safely, it’s always a good idea to contact a professional. Furnaces involve high-voltage electricity, gas, and moving parts, which can be hazardous if mishandled. Our HVAC technicians at The AC Guy can quickly determine the issue and perform the necessary repairs to get your furnace operational again.
Rather than struggling with a malfunctioning furnace, trust our experts to handle the problem properly. Your safety, comfort, and peace of mind are priorities. Regular furnace maintenance and service calls can also help identify potential problems early and keep your system running efficiently all season.
Call The AC Guy Today to Get Your Furnace Back Up and Running
While it's frustrating when the heat won't turn on when you need it, the good news is many of these issues are easily fixed, or at least diagnosed and repaired by a pro. The next time your furnace acts up, check these potential problems first. Sometimes though, the time, effort, and money you can save by calling a professional instead of DIY-ing it can be worth it.
At The AC Guy, we have the skills and experience to inspect and fix your furnace efficiently and effectively. If your furnace is not blowing hot air, give us a call and let us figure out the problem. Keeping your heater running properly to warm your house is a priority that’s worth investing in. Schedule your appointment with us today!
281-419-8035