5 Common Troubleshooting Tips for Your Furnace and AC

troubleshooting ac

A reliable furnace and air conditioning unit is essential in maintaining a comfortable environment in your home, especially during extreme weather conditions. As a homeowner, it’s crucial to be aware of common furnace and AC repair issues and how to troubleshoot them effectively. With this knowledge, you’ll be able to save time and money by knowing when to call a professional or handle the issue yourself.

In this blog, we will be discussing five common troubleshooting tips that will help you avoid frequent furnace and AC repair issues. As experts in the field, we aim to provide you with the most reliable advice and resources to help you maintain your HVAC system for optimal performance.

The Importance of Regular Air Filter Replacement and Cleaning

Air filters play a significant role in maintaining the air quality in your home and ensuring the efficiency of your HVAC system. The main purpose of air filters is to trap dust, pollen, pet dander, and other contaminants that could potentially damage the HVAC components over time. However, when air filters become clogged with debris, they hinder the airflow within the system, forcing it to work harder and consume more energy.

To avoid this issue, it’s essential to replace or clean your air filter regularly. A simple guideline is to check your air filter every month, and if it’s visibly dirty, consider cleaning or replacing it. Most disposable air filters should be replaced every 90 days, while reusable filters should be cleaned according to the manufacturer’s instructions. By keeping your air filters clean and functioning correctly, you will improve your HVAC system’s performance, prolong its lifespan, and maintain optimal indoor air quality.

Troubleshooting Thermostat Settings for Efficient Temperature Control

The thermostat is an integral component of your HVAC system, responsible for regulating temperature and providing a comfortable living environment. However, if your thermostat settings are incorrect, your furnace and AC may not function efficiently. To avoid untimely furnace and AC repair, consider the following tips:

– Verify the Mode: Ensure that your thermostat is set to the correct mode, either heating or cooling, based on the season.

– Check the Temperature Setting: Make sure that the thermostat temperature is set to a comfortable level. If your desired temperature differs from the actual room temperature, try adjusting the setting accordingly.

– Examine the Batteries: Some thermostats require batteries. If your thermostat is unresponsive or inaccurate, try replacing the batteries and see if this resolves the issue.

– Verify the Correct Scheduling: Programmable thermostats allow you to set temperature schedules for different times of the day. Ensure that your schedule is set up correctly, and your thermostat is following the programmed routine.

If you’re still experiencing issues with your HVAC system after checking your thermostat, it’s best to consult a professional technician to diagnose and resolve the problem.

Regular Inspection and Cleaning of the Outdoor Unit

The outdoor unit of your HVAC system, which houses the compressor and condenser, plays a critical role in keeping your furnace and AC functioning efficiently. Debris, dirt, and leaves that accumulate around the unit can obstruct the airflow and impact the unit’s performance. To maintain the optimal functioning of your outdoor unit, follow these steps:

– Clear the Surrounding Area: Keep the area around the outdoor unit free of debris, vegetation, and other obstructive elements. Ensure that there is at least 2 feet of clearance around the unit to facilitate proper airflow.

– Clean the Condenser Coils: Over time, dirt and grime can accumulate on the condenser coils, affecting the heat transfer process. Use a gentle brush or soft cloth to clean the coils carefully.

– Check and Straighten the Fins: The fins surrounding the condenser coils are delicate and can be easily bent, obstructing airflow. If you notice any bent fins, use a fin comb or a soft brush to straighten them gently.

Remember to turn off the power to the unit before performing any cleaning or maintenance tasks.

Understanding Circuit Breaker Issues and When to Call a Professional

Circuit breakers are designed to protect your home’s electrical system from hazards, such as overloads or short circuits. If you notice that your furnace or AC isn’t turning on, it’s possible that the circuit breaker has tripped. Locate the circuit breaker panel in your home and check for any tripped breakers. If necessary, reset the breaker and see if your HVAC system begins functioning again.

However, if your circuit breaker continues to trip repeatedly, it’s a warning sign of a more serious issue, such as faulty wiring or an overloaded circuit. In this case, it’s imperative to call a professional technician to diagnose the problem and implement the necessary repairs. Attempting to resolve electrical issues without the proper expertise can be dangerous and lead to further damage.


Understanding the common issues that might affect your furnace and AC systems is essential to maintaining a comfortable home environment. With the right knowledge, you can perform basic troubleshooting tasks, like cleaning air filters and examining thermostat settings, to save time and money on repairs. However, it’s crucial to know when to enlist the help of a professional, such as in situations involving complex electrical issues or persistent system malfunctions.

Lennox Dealers Toronto is your dependable partner in ensuring a comfortable living environment for you and your loved ones. Our team of experienced technicians is available 24/7 for emergency services to install, maintain, and repair your HVAC systems. As a proud provider of Lennox® products and services for all major brands of furnaces and air conditioners, we guarantee consistent, high-quality performance to keep your home comfortable year-round. Contact us today to learn more about our Lennox® furnace repair in Toronto and experience the reliability and expertise that sets us apart.

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