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Why Is My Heater Blowing Cold Air?

Is there anything worse than turning your heater on during a cold day only for it to blow more cold air into your home? We don’t think so either. If your heater is blowing cold air into your home, something is wrong. This can be caused by a number of issues, some of which you can easily take care of yourself. Keep reading to discover what might be causing your heater to blow cold air.

Your Thermostat Is Set Incorrectly

This might seem like a no-brainer, but sometimes we accidentally set our thermostats incorrectly, resulting in the heater blowing cold air. If your fan is set to “ON,” it will continuously run, even when the heater itself is not running. That means your blower will run 24/7, cycling cold air through your home whenever the heater turns off.

This issue is easily fixed by turning the fan settings to “AUTO.” In AUTO mode, the blower will only run when the furnace is on, which means it will only blow warm air into your home.

Your Filter Is Clogged

The air filter in your heater is designed to catch and remove pollutants from your air before it cycles into your home. Over time, it will become extremely dirty, to the point that it clogs and restricts the airflow in your home. Dirty air filters prevent air from flowing over the furnace’s heat exchanger, which can cause it to overheat and malfunction. A malfunctioning heat exchanger will force the heater’s burners to shut off, effectively keeping the heater from heating any air.

To fix this problem, you should replace your air filter right away. If your system is still not working properly, it is possible that the strain of the clogged air filter caused some damage that needs to be repaired by a professional.

Your Furnace Has Overheated

Sometimes, due to age, dirt buildup, clogged air filters, or mechanical failure, furnaces can overheat. When the heater overheats, there are safety features that will automatically turn the burners off and shut your system down. This is your system’s way of preventing a major breakdown or safety hazard.

The Condensate Drain Is Clogged

Many heaters have a condensate line that moves water away from the system to help it run smoothly. When this line becomes clogged (with dirt, mold, ice, or dust), water can back up into the heater and shut the system down.

If you suspect you have a clogged condensate line caused by ice, insulate the pipe to thaw the ice out. If this doesn’t work, the clog is likely caused by something else. We recommend scheduling an inspection to have the clog repaired.

The Pilot Light Is Out

In older heaters with standing pilot lights, the light can sometimes go out. If the pilot light on your heater goes out, your system will blow cold air into your home. If this happens once, it isn’t a big problem, but a pilot going out frequently is a potential sign of a more serious issue.

The Ductwork Is Leaking

If there are gaps, cracks, or holes in your ductwork, cold air can make its way inside of it to be circulated throughout your home. If it seems like there are bursts of warm and cool air throughout your home, we recommend scheduling a ductwork inspection. Sealing the damaged ducts will keep cold air out.

Call Parks Heating, Cooling & Plumbing

If your heater isn’t quite working the way it should be, turn to the professionals at Parks Heating, Cooling & Plumbing. Backed by 40+ years of service excellence, there is no heating problem we cannot solve. Equipped with state-of-the-art tools and technology, our technicians locate the exact source of the problem before implementing the best possible solution.

In addition to repairs, our heating experts offer the following services:

When you want the job done right, turn to Parks Heating, Cooling & Plumbing.

Call (704) 313-1443 or contact us online to schedule a heater inspection. We look forward to restoring comfort to your home.

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