How to Troubleshoot Common Furnace Problems？

Updated Jul 06, 2024 By Clever Plumbing & Heating

As winter draws near, ensuring your furnace is running smoothly becomes essential. A malfunctioning furnace can not only make your home uncomfortable, but it can also lead to unexpected repair costs that can reach hundreds of dollars. Luckily, many common furnace issues are straightforward to diagnose and fix. In this guide, we’ll cover frequently encountered problems and offer practical solutions.

Understanding Your Furnace

Before troubleshooting, it’s helpful to understand the key components of your furnace. Residential furnaces typically operate on gas or electricity and include several essential parts such as the burner, heat exchanger, blower, and various safety mechanisms. Knowing these parts can make it easier to spot potential issues.

No Heat? Check the Thermostat

If your furnace isn't producing heat, the problem often lies with the thermostat. Here’s how to check:

1. Check the Settings: Ensure your thermostat is set to "heat" and the desired temperature is higher than the current room temperature.

2. Replace Batteries: If your thermostat runs on batteries, changing them can often resolve the issue.

   
   

3. Calibration: Sometimes, your thermostat may need recalibration. Consult your user manual for easy instructions on how to adjust it. According to studies, about 15% of thermostats need recalibration at least once a year.

   
   

If these steps don’t get your furnace working, you may want to reach out to a heating expert for further assistance.

Furnace Won't Start? Inspect the Power Supply

If your furnace fails to start completely, the power supply could be the issue. Follow these steps:

1. Circuit Breaker: Check the circuit breaker panel. If the furnace’s breaker has tripped, resetting it could solve the problem.

   
   

2. Power Switch: Ensure that the power switch near the furnace is turned on.

   
   

3. Furnace Door: Many furnaces have safety switches that deactivate the system if the access door isn't properly secured. Make sure the door is latched tight.

   
   

If the furnace still doesn’t start, you may need a professional to investigate a deeper electrical issue.

Strange Noises? Identify the Source

Furnaces may produce various sounds, some of which can indicate trouble. Here are some common noises:

1. Banging or Clanging: This may signal loose parts or a malfunctioning blower. Check for any loose screws in the blower assembly.

2. Squealing: A high-pitched squeal often indicates a worn-out blower motor or fan belt. Regular maintenance or replacement of these parts can cost between $150 to $400.

   
   

3. Rumbling: If you hear rumbling sounds, it could mean dirty burners or a gas buildup. Safety is key, so turn off the furnace and clean the burners as instructed in the manual.

   
   

If the source of the noise is unclear, consider consulting a technician.

Poor Airflow? Check the Vents

When your furnace runs but the heat isn’t flowing well, inadequate airflow could be the reason. Here’s how to address it:

1. Blocked Vents: Make sure all vents and registers are open and unobstructed by furniture or curtains.

   
   

2. Dirty Filters: A clogged air filter can significantly limit airflow. It’s advisable to inspect and replace your filter every 1 to 3 months during the heating season. According to the U.S. Department of Energy, a dirty filter can decrease your system's efficiency by 5 to 15%.

   
   

3. Ductwork Issues: Look for any visible leaks or damage in your ductwork. Sealing these leaks can improve efficiency and airflow, often resulting in lower energy bills.

   
   

Frequent Cycling? Adjust the Thermostat

If your furnace frequently turns on and off, it may be short cycling. This can lead to higher energy bills and shorten your furnace's lifespan. Here are a few strategies to mitigate this:

1. Thermostat Location: Ensure the thermostat isn’t placed near drafts, heat sources, or in direct sunlight. This placement can cause inaccurate temperature readings.

   
   

2. Oversized Furnace: If your furnace is too large for your space, it can heat too quickly, leading to short cycling. Consulting a professional about your furnace size can help solve this.

   
   

3. Dirty Filters: As mentioned, clean filters are crucial. A good habit is to change your HVAC filter according to the manufacturer's recommendations, as neglecting this can lead to up to a 30% increase in energy costs.

   
   

Regular Maintenance is Key

Preventing furnace issues is all about regular upkeep. Schedule annual inspections with a qualified technician to keep your system running efficiently. These inspections typically involve cleaning vital components, checking for wear, and making necessary adjustments. Investing in routine maintenance can extend the life of your furnace, which averages around 15 years, and saves on unexpected repair costs.

Keeping Your Home Cozy Year-Round

Troubleshooting common furnace problems doesn’t have to feel overwhelming. By following these steps, you can resolve many issues yourself. However, if you encounter a more complicated problem, don’t hesitate to contact a professional. A well-maintained furnace will ensure your home stays warm and comfortable during the colder months. Remember, proactive maintenance can save you time, money, and discomfort in the long run!

Stay warm and save money with Clever Plumbing & Heating's  Furnace and Thermostat Services. Contact us for a free quote today.

Remember to always follow safety precautions when working with electrical or plumbing systems to avoid accidents and injuries.

*** The information provided in this guide is intended for general informational purposes only and should not be considered as professional advice. While we strive to provide accurate and up-to-date information, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability, or availability with respect to the information contained in this guide. Any reliance you place on such information is therefore strictly at your own risk.

Before attempting any repairs or maintenance on your water system, please ensure you have the necessary skills and knowledge. If you are not confident in your ability to safely and effectively perform the tasks described, we strongly recommend that you contact a licensed professional. We will not be liable for any loss or damage, including but not limited to indirect or consequential loss or damage, or any loss or damage whatsoever arising from your use of or reliance on the information in this guide.s flawlessly, allowing you to focus on what truly matters—making your house a home.