A broken furnace in the middle of winter is a homeowner’s nightmare. However, some common furnace problems have simple solutions. This post will discuss 5 common furnace problems, helping you troubleshoot and potentially avoid a costly service call. From pilot light issues to dirty filters, this guide covers everything from simple checks to understanding when calling a professional for furnace repairs is necessary.
1. Thermostat Troubles: The Unsuspecting Culprit
Often, the issue isn’t the furnace itself, but the thermostat. Ensure it’s set to “heat” and the temperature is at least five degrees above the current room temperature.
Check the thermostat for errors or low batteries, which can disrupt its function. A malfunctioning thermostat can cause your furnace to stop working altogether.
2. Air Filter: A Clogged Artery
Clogged air filters are almost always at the top of the list of 5 common furnace problems. Your furnace filter traps dust and other airborne particles. However, a clogged filter restricts airflow, reduces furnace efficiency, and can lead to a constantly running furnace.
Swap air filters out regularly, ideally monthly, especially in homes with pets. Changing your air filter is a simple DIY task that can prevent many furnace problems.
Finding the right air filter depends on factors like pets and household size. Dirty filters can lead to reduced efficiency and improper airflow.
3. Ignition Issues: Spark or No Spark?
Furnaces use a continuous spark to ignite gas. In older furnaces, this is a pilot light. Even a draft from an open window can extinguish it.
Newer furnaces utilize electronic ignition systems and a flame sensor. This safety feature shuts off the gas supply if no flame is detected, preventing gas leaks.
A dirty flame sensor can malfunction, causing the furnace to shut down unnecessarily. Some ignition issues, like a cracked heat exchanger, require professional furnace repair. A repair expert will be needed to diagnose this complex issue.
4. Blower Motor Problems: When the Heart Stops Pumping
The blower motor circulates warm air throughout your home. If it breaks, your home will get cold. A failing blower motor often makes unusual noises—grinding, scraping, or squealing. If you hear grinding or scraping, suspect worn-out ball bearings.
This requires immediate attention from a professional. Squealing usually indicates a slipped or worn blower belt.
Oiling the blower motor can sometimes resolve the issue and quiet a noisy furnace. If your furnace isn’t blowing air, a malfunctioning blower motor could be the culprit.
5. Limit Switch Issues: When Safety Takes Over
The limit switch is a safety feature that prevents the furnace from overheating. If it’s tripped or broken, the furnace won’t work. This safety switch is an important component.
A repair technician can easily replace a faulty limit switch. Before calling for service, check the limit switch. A tripped breaker could also be causing the problem, so make sure the circuit breaker isn’t tripped.
Testing the limit switch will help you identify if it’s the source of your stopped-working furnace. If the thermostat isn’t the issue, and the furnace still isn’t working properly, then a professional can help.
More Furnace Issues to Watch For
Beyond these 5 common furnace problems, other issues can cause furnace breakdowns. Watch for leaks around the furnace base, which may indicate condensation problems, especially in high-efficiency furnaces.
A cracked heat exchanger is a serious hazard. It can leak carbon monoxide into your home. Be aware of these potential threats to maintain a safe and healthy living environment. Be sure to have a working carbon monoxide detector installed.
If your circuit breaker trips repeatedly or you smell gas, contact a qualified technician immediately. Even if your furnace appears to be running properly, schedule furnace tune-ups, especially before winter. If cleaning the filter, checking the power, and adjusting the thermostat doesn’t resolve the issue, you need professional help.
Regular maintenance helps prevent breakdowns, whether it’s an oil furnace or a gas furnace. A furnace tune-up ensures all parts are working properly, including the burner assembly, and can identify potential issues before they become major problems. While you can fix issues like clogged filters, or thermostat batteries, you will likely need to call in a trusted HVAC company to look at other issues.
A furnace repair technician can diagnose issues and make necessary repairs, from replacing a blower belt to fixing a cracked heat exchanger. Preventative tune-ups can also help identify issues like improper airflow or squealing noise, often indicating a problem with the blower motor. Additionally, regular maintenance can reduce the risk of your furnace running constantly, or cycling on and off too frequently, known as short cycling, thus reducing efficiency.
Solve These 5 Common Furnace Problems with Expert Help
Dealing with furnace problems (especially our listed 5 common furnace problems) can be frustrating, but knowing what to look for is helpful. Simple fixes like adjusting the thermostat or replacing dirty air filters can resolve minor issues. These small steps are a great start for DIY troubleshooting. Cleaning dirty filters and ensuring proper airflow can significantly improve furnace function. A professional furnace repair service can help you take care of all your needs.
However, more complex issues, like a scraping sound from the blower motor, require a trained technician. Regular maintenance, including replacing worn parts and checking for gas leaks, can help avoid common problems and ensure efficient furnace operation. Don’t hesitate to call a professional if you encounter a problem you can’t solve yourself.
Turn to Service Pro Heating and Cooling for expert furnace services! Contact us today for more information or to schedule a free consultation.