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A Furnace That Blows Out Cold Air: Why It May Happen to You!

Broken Furnace

Your furnace has a straightforward job: send warm air into your house on cold days. Of course, the actual workings of a furnace aren’t simple, and that’s why sometimes they can malfunction and end up sending out air that doesn’t warm a house at all.

I write about furnaces often and know plenty about how they can run into trouble. The good news is that with the proper HVAC service in Seymour, TN from our team of pros, you can prevent these problems or have them solved fast. Fixing your home comfort problems is what we’re all about!

But now I need to switch over into “Olive the Furnace Professor” mode and talk about why you may have a furnace that’s made your home an icebox and not a cozy retreat.

1. Failure to ignite

This trouble is common to gas furnaces. These furnaces generate heat by igniting gas coming from the burners. No flames means no heat—and often it’s trouble from the electronic ignition system that causes it. Most furnaces today use electronic ignition to light the burners rather than a standing pilot. But the igniter can burn-out, similar to a light bulb, and not light the burners. The gas from the burners will then shut off as a safety precaution. Thankfully, this isn’t a big problem for our experts: they’ll replace the ignition system and check on gas flow to see everything is okie-dokie.

2. Trouble with the gas flow

Your gas furnace’s burners may not ignite because the burners aren’t receiving gas from the gas line. This can happen for several reasons, such as a stuck gas valve. If you’re using your furnace for the first time this season, I recommend you check on the furnace switch near the unit, which might still be “off” and stopping any gas flow. Any other type of repair for gas lines you must leave to our licensed pros to ensure your family stays safe.

3. The pesky miscalibrated thermostat

You can’t always trust that the thermostat will work exactly the way it should. A thermostat can start detecting incorrect temperatures in your home. That means it may turn on the fan for the furnace but not turn on the burners to create heat because the thermostat thinks the house is already warm enough. Raising the thermostat higher to attempt to overcome this is not the way to go! You need a real repair, as well as experts who’ll check to see there are no other potential problems with the furnace.

4. Broken sequencer

This one is for all-electric furnace owners out there: if your electric furnace isn’t giving you any heat, it may have a broken sequencer. This is the component that turns on heating elements one by one. But if it corrodes, it may not turn on any heating elements. Even though electric furnaces don’t have the same safety protocols as gas furnaces, replacing or fixing the sequencer must be left to professionals.

There are other possibilities for your faulty cold furnace, so when in any doubt, call us! We can get to the bottom of the problem and have it solved for the long-term.

Stay warm,