common furnace problems

5 Common Furnace Problems (And How to Fix Them)

Is your furnace acting up in the midst of winter? It may be time to look into furnace troubleshooting.

Contrary to what you might have heard, furnace repairs are not that complicated. Sure, sometimes you’ll have to call a professional. In many cases, however, you can easily identify and solve the issue on your own.

Here are five common furnace problems that you may be able to fix yourself.

1. Furnace Doesn’t Produce Heat

First things first: check that the thermostat is set to “heat,” and make sure that the fan is on “auto.” Keep in mind that your thermostat needs to be set at a temperature high enough to activate the furnace.

If the thermostat is set correctly, it may need to be cleaned. Check the interior components for any dust and debris. While you’re at it, check the batteries as well.

If the problem persists, you may be dealing with a dirty furnace filter. A dirty filter will prevent the airflow from coursing through the furnace. Ideally, you should change your furnace filter on a monthly basis.

2. Furnace Keeps Turning On and Off

There’s actually a term for this behavior — it’s called “short cycling.”

Once again, the main cause of short cycling is your thermostat. If it’s placed too close to a heat source, it will signal your furnace to shut off.

To make sure your thermostat isn’t broken, try turning it to the opposite setting. For example, if it was set to “heat,” turn it to “cool.” If nothing happens after five minutes, check the electrical panels for a tripped breaker.

3. Furnace Is Too Noisy

In addition to being annoying, a noisy furnace is usually the sign of a serious problem. The bad news is that there are a lot of possible causes. The good news: they’re not that hard to identify.

For example, constant squealing usually points to a loose fan or lack of lubricant. You can solve this problem by tightening your blower or applying oil. When it comes to furnace troubleshooting, this is a fairly simple fix.

4. Furnace Pilot Light Goes Out

If your pilot light isn’t working, your furnace won’t be able to ignite its burner. Fortunately, you can relight the pilot yourself. Before going through with it, however, make sure you can’t smell any gas in the area.

Find your gas valve (it’s usually painted red), turn it off, and wait three minutes. Then, switch it to the pilot setting, light a match, and hold it close to the pilot opening. While you’re doing that, keep the reset button pressed down.

Once the pilot flame is ignited, switch the valve back on.

5. Furnace Blower Doesn’t Turn Off

Your furnace fan won’t stop running? It may be set to manual override.

Find your fan limit switch (it’s usually located under the furnace hood). There’s a white button here — check whether it’s pressed in. If it is, simply pull it out to reset the fan limit switch to “auto.”

If the blower keeps running, your fan limit switch is probably faulty. Unfortunately, the only real solution here is to replace it.

More on Furnace Troubleshooting

Many furnace issues can only be solved by professional technicians. If this guide doesn’t help you solve the problem with your furnace, you can always contact us right here. We’ll assess the issue and repair your furnace as soon as possible!


Are you experiencing furnace problems? Chill Air Concept is a top HVAC company in North Dallas, specializing in furnace repair and diagnosis.  Request an Appointment online or call the Chill Air Team at  (972) 699-8080 to schedule a furnace check today!


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Chill Air ConceptTop-rated, professional commercial & residential AC, heating & refrigeration company serving North Dallas, Texas since 2000. Licensed, Bonded & Insured contractor – We repair and service all HVAC brands, makes & models. Call (972) 699-8080 or send us a message here to schedule your appointment with us.