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Bryant Furnace Not Blowing Hot Air? 4 Common Causes (+ Fixes)

You expect your Bryant furnace to keep your home warm throughout winter. But what can you do if your Bryant furnace is blowing cold air even though it’s freezing outside? Dealing with furnace problems in the middle of the night or after a busy day is frustrating, but thankfully, you came to the right place!

If your Bryant furnace isn’t blowing hot air, there’s an issue with the thermostat, gas supply, air filter, ignition system, ducts, or heat registers. Check the thermostat settings and gas valve, clean the air filter, fix the ignitor and leaky ducts, and unblock the heat registers.

This article will explain some of the most common causes for a Bryant furnace malfunction and how to troubleshoot and fix them. I’ll also explain when it’s best to call a professional HVAC technician instead.

There’s an Issue With the Thermostat

If your Bryant furnace is blowing cold air, the first thing you need to check is the thermostat. Sometimes, something as simple as not having the thermostat set to HEAT could be the reason why you’re getting cold air from the vents. 

You also need to set the thermostat temperature above the current indoor temperature. 

While at it, check to see the blower fan isn’t set to ON, as this would mean the fan is running even when the heating cycle isn’t running. The cool air coming through the vents is from the fan. You can fix this problem by setting the fan to AUTO. That way, it’ll only blow air when the furnace is running.

You may want to check the thermostat batteries too. Low batteries can cause a thermostat to malfunction, and it may not be able to turn on the furnace. Try replacing the older batteries or recharging the thermostat to see if it solves the problem. 

The Furnace Isn’t Getting Gas

Have you had your furnace repaired lately? The repair guy may have closed the gas control valve and forgotten to open it after he was done. Without gas flowing to your furnace, there’ll be nothing for the burners to heat. The furnace may even shut down for safety measures. 

Check to see the gas control valve is open. The valve handle will be parallel to the outlet line if the gas is on. A closed valve will have the valve handle perpendicular to the line. 

If your Bryant furnace won’t blow hot air even after opening the gas valve or if you smell gas, turn off the gas valve right away and call an HVAC technician. 

The Furnace Filter Is Dirty

Do you remember the last time you had your filter replaced? If the answer is no, chances are it’s been a minute. If your Bryant furnace is blowing cold air, blame your dirty filter. 

A filter is installed in a furnace to protect the internal components from dust, debris, hair, and other elements. 

If you haven’t changed your furnace filter for a while, dirt will find its way to the burners, compromising their performance. A clogged burner will have trouble igniting and burning air, and you’ll instead have cool air blowing into your home. 

Luckily, you can fix this quickly, assuming that the old filter hasn’t damaged other furnace components. All you need to do is get rid of the dirty filter and install a new one. 

Note: If your Bryant furnace is running on a one-inch-thick filter, you should change the filter every 30 days. Filters two-inch thick and above can be replaced every 90 days, though people with pets or respiratory allergies should do it more often. 

The Furnace Isn’t Lighting

Problems with the ignition system can cause your Bryant furnace not to blow hot air. If your furnace is working correctly, the igniter or pilot light (in older Bryant models) will light the burners to heat the gas, resulting in hot air.

If the ignitor is defective or clogged with dirt or the pilot light is out, your furnace can’t produce hot air because no combustion is taking place. 

You can check for a defective ignitor using a multimeter, but repairing or replacing a faulty ignitor is best left to a professional. You can clean a clogged or rusted ignitor yourself, though. Here’s how:

  1. Turn off the furnace.
  2. Open the front panel.
  3. Locate the ignitor.
  4. Remove it from the furnace.
  5. Scrape the dirt and corrosion off with a piece of steel wool or fine sandpaper.
  6. Reinstall it and turn the furnace on.

If you have an older Bryant model that uses a pilot light, check to see the flame is on. Your light should stay on at all times to keep your system blowing hot air. However, something like recent maintenance work or an emergency can turn the light off. When that happens, your furnace can’t ignite to produce hot air.

In this case, you need to check the furnace and relight the pilot yourself. Refer to the owner’s manual to ensure you’re doing it right. 

If the light goes out again almost immediately and repeats this a couple of times, call in an HVAC professional.

You Have Leaky Ducts

Suppose you realized that some areas in your house are getting hot air, whereas others are freezing, or the airflow isn’t as strong as it used to be. In that case, this is likely a problem with the vents or ductwork. 

The first thing you need to do is check the dampers to ensure they’re open. Fully open dampers will be parallel to the ductwork to allow the furnace to blow enough hot air to warm your home. 

If you’re still getting cold air from the vents, inspect your ductwork — you may have leaks. Ducts usually break due to extreme gas pressure or extreme temperature swings. Gaps, holes, and cracks in the ducts will bleed warm air before it can reach the heat registers. 

Leaky ducts will not only make some areas of your home cold but also run up your electricity bills. Your blower motor will be working harder than usual to push the little hot air left in the ducts through the vents. 

Sealing the ducts will solve this problem. But since the duct network consists of intricate parts, it’s best to enlist a professional’s services. 

The Heat Registers Are Blocked

In the end, the problem may not even be in the furnace itself; it could be that you just have something closing the return air grilles. 

If you have furniture blocking the only opening through which heat is supposed to enter your room, your home can’t get warm, leading you to think your furnace isn’t blowing hot air. 

Solving this problem is easy — all you have to do is ensure there are no objects in front of the heat registers.

Final Thoughts

While Bryant heating systems are built for reliability and efficiency, sometimes mechanical glitches prevent them from functioning optimally. If your furnace isn’t blowing hot air, ensure:

  • The thermostat is set right. 
  • The furnace is getting gas.
  • The filter isn’t clogged with dirt.
  • The igniter is lighting the burners.
  • Your air ducts aren’t leaking air.
  • The heat registers aren’t blocked.