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The Most Common Furnace Problems: A Breakdown by Our HVAC Specialists

Here are top 5 reasons why you’re having issues with your furnace and how to fix them. And if you need help, Smart Air Cooling and Heating is capable of solving the most common furnace problems in no time.

It is a cold winter day, and you should be feeling cozy at home. Instead, you have to call a heating services company to fix your furnace. In this article, we will talk about the most common furnace problems and how to deal with them. A furnace not running is not always a sign of catastrophic malfunction. Indeed, an experienced HVAC technician can get it up and running in no time.

However, it is important to remember that all furnace problems should be treated seriously from the first signs of malfunction. Also, you should not attempt with the heating unit. This is a very complex piece of equipment connected to your gas main. Any wrong move could lead to a severe gas leak and disaster for your family.

The best thing to do when you notice the furnace not running is to call a HVAC company to send a licensed technician to inspect the equipment and repair it.

Image of HVAC technician inspecting a furnace

Learn About the Most Frequent Furnace Problems

Let us now look at the most common furnace problems you may experience. You can troubleshoot some of them by checking various settings of the equipment. If none of the suggested actions solve the issue, you should call a HVAC company.

The Furnace Does Not Produce Heat

Now, this is one of the most common furnace not working issues. And there can be various reasons for it:

  • The fan setting on the thermostat
  • The thermostat is not turned on 
  • The thermostat is not set to “heat” or the temperature is set too low
  • The pilot light is off and does not ignite the furnace

How to troubleshoot furnace not producing heat: first of all, check the thermostat. In many cases, the fan is on or the heat is off. Otherwise, you set the temperature too low and the furnace is generating exactly as much heat as you told it. Finally, check if the pilot light is working. In older furnace models, the pilot light is permanently on. Newer models have electronic ignition and the flame is triggered automatically when the furnace starts its heating cycle.

However, if none of these troubleshooting actions work, the problem may be more serious. A HVAC technician will rule out all other common furnace problems and then focus on finding the malfunctioning part.

You Have a Noisy Furnace

Furnaces are not exactly quiet, but their noise level should not be disruptive. If you can hear squeaking, rumbling, and rattling noises, you have furnace problems. These noises are caused by mechanical problems, such as the furnace belt (for older models) to the motor of the blower. In some cases, a part has become loose and needs to be tightened.

How to troubleshoot furnace that makes noises: always call a HVAC company. This is not DIY troubleshooting because you are not qualified to open up the equipment and work on it. In many instances, unauthorized repairs may void the producer’s warranty for the furnace.

Your Furnace Keeps Turning On and Off

Furnaces are designed to work following an on/off cycle. When the thermostat detects low temperature in the room, it triggers the furnace. When the set temperature is reached, the furnace turns off.

Furnace problems arise when this on/off cycle is very frequent and you never get the set temperature in the room. The reason for this is restricted airflow in the furnace, causing it to overheat. The safety switch will shut down the system it the temperature reaches a dangerous level.

How to troubleshoot furnace turning on and off: in some cases, a clogged air filter restricts the airflow. If replacing the filter does not solve the problem, you should call a HVAC company.

Dirty Filters

Filters are consumable parts of any HVAC equipment. They need to be replaced at least once per year. Clogged filters trigger some of the most common furnace problems. The good news is that you can easily solve this problem by replacing the filters – a simple operation you can perform after looking in the user’s manual for the step by step instructions.

The Furnace Is Not Heating to Set Temperature

If you never get the set temperature with the furnace running, most probably the thermostat is not calibrated.

How to troubleshoot furnace not producing a set temperature: check the thermostat for calibration. In some cases, it may have to be replaced. A HVAC technician can help you with this simple operation.

How to Troubleshoot Furnace That Doesn’t Work Properly

Many of these common furnace problems have simple solutions. However, if you cannot solve the issue by following the troubleshooting tips in the user’s manual, you should not try a DIY repair.

Find a professional HVAC company near you and ask them for assistance. An experienced technician will identify and fix the problem, and you will receive warranty for the workmanship and the parts used.

We Can Help You with the Most Common Furnace Problems

Smart Air Cooling and Heating is a licensed HVAC company always ready to help you with furnace problems. We are experienced in repairing both older and newer furnace models. When we believe the furnace not working is too old, or the repair work too expensive, we will advise you to consider replacing your furnace.

Our offices are in Austin, TX, but we also help customers with furnace problems in:

  • Westlake
  • Rolling Wood
  • Dripping Springs
  • Buda

Call us now: 512-000-4311!