The Most Common Furnace Problems And How To Fix Them

Room wall temperature thermostat turn dial to set

The furnace is a crucial component of the heating system in your home. Experiencing temperature fluctuations could mean your furnace might have a problem that requires timely attention. Overlooking a furnace issue might put you in a scenario where you’ll end up without warmth, especially during the cold months.  

Luckily, you can resolve most of the furnace problems you’ll encounter at some point or call a professional. Once you notice something is wrong with your furnace, consider checking out Terrell, TX Furnace Repair and other similar providers to ensure a head start with a potential issue. 

If you’re interested in knowing more about the maintenance of the cooling and heating systems in your home, watch this video:

Here are the common furnace problems you should know and how to remedy them.  

  • Blocked Filter  

Many homeowners often need to pay more attention to changing the furnace filter. Consider it a crucial maintenance task so your furnace functions optimally by guaranteeing the best when it comes to air quality and flow.    

When you have a clogged filter, the air handle strains to compensate for poor airflow. Sadly, this can result in a skyrocketing utility bill while causing the heat exchanger to overheat and even shut down prematurely. The best way to avoid this issue is to inspect the air filters regularly and replace them as needed, checking if it’s installed properly to ensure efficiency.  

  • The Thermostat Is Switched Off  

Occasionally, an issue with your furnace may have a specific cause. A possible issue is that the thermostat that has been turned off. The initial task is to check the status of the thermostat. It can happen when someone accidentally turns it off.  

If unable to switch the thermostat on isn’t the cause, you can remedy some of the common issues with your thermostat. Some measures include replacing the batteries, cleaning any dust or debris buildup, inspecting the breaker, and ensuring the proper configuration of the thermostat. Ideally, it should be at least five degrees above room temperature.  

  • The Blower Of The Gas Furnace Operates Continuously 

If you cannot shut off the blower of the gas furnace, it may require a repair job by a professional. However, you must first check if the thermostat is in a continuous fan configuration. Another option you can try is to adjust the temperature to a lower setting to see if the fan turns off. In some cases, there may be an issue with the limit control switch, which may require resetting or a replacement.  

  • Dirty Flame Sensor  

In any furnace model, the flame sensor is responsible for protecting against the hazardous burning of fuel. If it happens to be dirty, it’s likely to trigger a malfunction. If you’ll take a close look, the sensor takes on a form of a rod in the burner’s path toward the furnace’s rear. Detach it from the furnace after turning the power off so you can thoroughly clean it. Lastly, scrub out any lingering dust or residue.  

  • Unusual Noises From The Furnace  

Unusual sounds originating from the furnace may indicate an array of problems. If you hear a rattle-like noise, it indicates loose panels that require tightening. A squealing sound might suggest that the fan belt has slipped or needs a replacement. Lastly, if you perceive a grinding sound, it indicates that the motor bearings require fixing by a professional.   

  • Obstructed Vents  

Make it a priority to inspect every vent in your home to ensure they’re patent. In most cases, there might be objects or furniture in the way. To ensure efficient airflow, you must leave around 18 inches of space between the vents and furniture. Lightweight curtains can also obstruct the flow of warm air. Implementing changes with the positioning of your furniture will greatly help your furnace warm up your home correctly.  

  • Dirty Burner    

The burner flames are usually blue, which indicates that the burner is clean. However, if you notice the flames taking on a yellowish hue, it shows a dirty or blocked burner. The buildup of dust and debris over the summer season makes routine cleaning a priority, especially before the winter season arrives. The cleaning task is straightforward using a vacuum cleaner. Before cleaning, you must turn off the power and gas first.     

  • Damaged Safety Switch  

A furnace that no longer works may have a damaged safety switch. Make sure to check the safety switch on the furnace door. Remember that the safety switch prevents the fan and burner from turning on while removing the access panel.  

Furnaces have a safety switch that pops out once the door is removed. The door should be in the proper position so that the switch activates and the furnace will turn on. If the safety switch requires a replacement, switch off the power and open the door. Carefully wire in the new safety switch and test to ensure that your furnace turns on upon closing the door.  

Final Thoughts  

The furnace should stay in optimal years to ensure your home maintains a comfortable temperature all year round. Sadly, a time will come when issues with your furnace will develop. Knowing the common furnace issues will surely come in handy so you know what to do. Timely action or calling a professional will ensure your furnace stays in good working order.


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