10 Common Furnace Problems

If your furnace is on the fritz, Design Aire is here for you. For over a century, our furnace repair and furnace maintenance services in St. Louis and St. Charles have kept families comfortable through the cold Missouri winters. Below are 10 of the most common heating problems we solve.

   Contact the HVAC Experts of St. Louis & St. Charles, MO: 314-739-1600

Contact the HVAC Experts of St. Louis & St. Charles, MO


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What is wrong with your furnace?

Here are 10 of the most common heating issues we diagnose and fix at Design Aire:

10. Frequent cycling.

If you notice that your furnace turns on and off in one or two-minute cycles, this is called “short cycling.” The furnace is shutting off as a safety feature and there could be a few possible problems such as issues with the thermostat, a clogged filter, or airflow problems, or something else, so it is important to call a professional to evaluate what is going wrong. Design Aire can help! Contact us!

 9. Reduced airflow

Your furnace might be working well, but if you have noticed the airflow isn’t the same as it used to be, there could be a problem with the system. One possible solution is replacing a dirty air filter. Filters naturally become dirty and clogged with use, which reduces airflow. An air filter that fails to work properly can make your furnace work harder in order to do its job, and can eventually lead to much more expensive problems.

8. Thermostat malfunction

If your fan is not blowing properly or if your furnace shuts off before it should, it could be a problem with the thermostat. Thermostat issues are relatively common. Not only can we diagnose this quickly, but Design Aire can fix your thermostat issues quickly and efficiently.

7. Pilot light fails to stay on

Many newer systems use an electric ignition while older ones might rely on a pilot light to stay in operational condition. If either of these fails, your furnace will fail to work like normal. The sensors might be dirty or there could be a clog, and only a technician will be able to identify the exact problem in order to make the necessary fixes.

6. Faulty blower motor

Your furnace blower circulates the air through your system. The blower motor can become dirty or lose power, and when it does, your furnace switches itself off. Our heating experts at Design Aire can identify blower motor problems and get your system up and running again.

5. The furnace isn’t heating your house

If your furnace isn’t heating your house well enough or if it won’t work at all, there can be a number of causes. Our heating repair team can identify if the problem is due to a clogged filter, age or lack of maintenance, the unit’s capacity, the thermostat, the power, the pilot light, the gas, the condensate pan, or something else — and we will solve the problem.

4. The furnace is making noises

Rattling, rumbling, or squeaking noises are not part of your furnace function. These loud noises can mean that your system has a mechanical problem, that airflow is reduced, or that you have a clogged burner. Call us for furnace repair as soon as you hear these noises so that they don’t turn into a more costly problem. Our furnace repair technicians will get to the bottom of the problem quickly.

3. The blower won’t stop running

If your blower is continuously running even when the heater has reached the desired temperature, your limit switch might have a problem and need to be replaced. A technician with the right parts for your model of furnace can both diagnose this problem and repair it in no time at all.

2. The furnace has a bad smell

If it has been several months since you started your heater and, upon the first usage, you notice a bad smell, you might have some maintenance issues that can be remedied fairly quickly. If you notice a mold smell, you might have ductwork problems or a poorly draining system that has mold buildup. If you experience an unpleasant burning smell, turn your system off immediately and contact a technician to diagnose and repair your heater. Don’t let these problems linger as they could signal larger issues that can be expensive to fix down the road!

1. Lack of regular maintenance

Seasonal HVAC inspections are important for keeping your heating and cooling systems running safely and efficiently. Our HVAC experts can check your entire system to avoid problems that can cause costly breakdowns. Over time, you’ll likely save money by extending the life of your HVAC system.

Need Furnace Repair? St. Louis & St. Charles, MO Trusts Design Aire

Let Design Aire do what we do best. Improper furnace repairs can pose gas- or combustion-related safety hazards, so leave your troubleshooting to our trained and expert team of furnace repair specialists. For over 100 years, we have established a proven record of honesty, integrity, and excellence.   

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Customer Testimonials

Seth was our salesperson. He listened to our needs and provided the right product at the right price. The installation team arrived on time and went right to work.They worked with confidence and professionalism.We appreciated the care in protecting our floors and even the choice of how they went up on the roof indicated that they really did care. This company did what they said they would and certainly has our vote of appreciation and gratitude. We will happily recommend Design Aire to anyone.

Ken L.

One of the best companies to work with. My own profession is in a service industry and so I very much appreciate all the positive things about Design Aire.
The install crew arrived right on time and took exactly how much time they said they would to complete the job. The work was done well, the crew cleaned up after themselves, and were very pleasant. Seth in the office was extremely in-tune to our needs and very responsive.
I would highly recommend Design Aire.

Heather H.

Our new HVAC system was installed yesterday and we could not be happier. From quote to completion the process was great! 100% would recommend!

Greg H.

We have used Design Aire for both a new furnace two years ago and a new AC unit this summer. Everything was done very professionally and quickly. I would not hesitate to recommend them to anyone needing any type of HVAC work done.

Sean K.

Design Aire was the best choice from start to finish. Design Aire gave me the best price with the most detailed quote. The service technicians were very friendly and completed the job ahead of time. I highly recommend Design Aire.

John K.

We've used them for our old house and our new house. They are honest, friendly, professional and affordable. We felt lucky to find them.

Maddy R.

I was very impressed with Design Aire. They were timely and did an outstanding job with the installation of my new furnace. They had great communication and went above and beyond. I would highly recommend them to friends and family. Thank you so much Seth and Design Aire for making this an effortless transaction. VERY PLEASED!

Jonny M.

Design Aire sent a salesman to plan the system, and just a couple of days later sent the installers to remove the old system and install the new one. Everything happened when they said it would and the system performs as they said it would. All of the Design Aire staff were courteous, the work was performed efficiently and neatly, and they left the area cleaner than they found it. This is the second unit Design Aire has installed for us, and I have no need to look elsewhere.

Dan L.