why does my furnace keep tripping the circuit breaker


Why Does My Furnace Keep Tripping the Circuit Breaker?


A furnace is an essential component of any heating system, and it plays a crucial role in keeping our homes warm during the chilly winter months. However, it can be incredibly frustrating when your furnace keeps tripping the circuit breaker, leaving you without heat and in a constant state of discomfort. Understanding why this occurs and how to resolve the issue is essential for maintaining a properly functioning furnace. In this article, we will explore the common causes behind a tripped circuit breaker and provide practical solutions to rectify the problem and ensure uninterrupted heating in your home.

The Role of the Circuit Breaker

The circuit breaker acts as a safety device, protecting your home's electrical system from potential hazards such as short circuits and overloads. When an excessive amount of electrical current flows through a circuit, the breaker trips, interrupting the electrical flow and preventing damage to the system. While the circuit breaker's purpose is to protect your home, a tripped breaker can be an indication that something is wrong. Several reasons can cause a furnace to repeatedly trip the circuit breaker, and gaining insight into these causes is crucial for troubleshooting the issue effectively.

Faulty Wiring

One common cause of a furnace repeatedly tripping the circuit breaker is faulty wiring. Over time, wiring can wear down, become loose, or develop short circuits. When the furnace is drawing electricity, faulty wiring can cause an excessive amount of current to flow through the circuit, triggering the breaker to trip. This issue can be particularly prevalent if your furnace has outdated or improperly installed wiring.

To determine if faulty wiring is the culprit, it is advisable to hire a professional electrician or HVAC technician to inspect your furnace and wiring system. They will be able to identify any damaged or inadequate wiring connections, rectify the issue, and ensure the safe operation of your furnace.


Another common reason for a furnace tripping the circuit breaker is overloading. Furnaces draw a significant amount of electrical power to operate effectively, and if the circuit they are connected to is already overloaded with other appliances or devices, it can cause the breaker to trip. Overloading often occurs when multiple high-energy-consuming devices, such as air conditioners, refrigerators, or space heaters, are connected to the same circuit as the furnace.

To prevent overloading, it is essential to distribute the electrical load evenly across different circuits. This involves identifying which devices are connected to the same circuit as the furnace and redistributing them to separate circuits if necessary. Consulting an electrician to assess your home's electrical capacity and make any necessary adjustments can help alleviate overloading issues and prevent the circuit breaker from tripping.

Restricted Airflow

Restricted airflow is another potential cause of a tripped circuit breaker in furnaces. When a furnace does not receive adequate airflow, it can cause the system to work harder, drawing more electrical power and potentially exceeding the circuit's capacity. Restricted airflow is often the result of clogged air filters, blocked vents or registers, or obstructions in the furnace's ductwork.

Regularly inspecting and cleaning the air filters is an important maintenance task that helps prevent restricted airflow. Additionally, it is crucial to keep vents and registers free from obstructions such as furniture or debris. If the ductwork is suspected to be the issue, enlisting the assistance of an HVAC technician can help identify any blockages or inefficiencies and ensure proper airflow throughout the system.

Malfunctioning Components

Malfunctioning components within the furnace itself can also be responsible for tripping the circuit breaker. A faulty blower motor, ignitor, or control board can draw excessive current, causing the circuit to overload and the breaker to trip. These components may become worn out due to age, lack of maintenance, or manufacturing defects.

If you suspect malfunctioning components to be the cause, it is advisable to hire a professional HVAC technician to inspect and diagnose the furnace. They will be able to identify the specific malfunctioning component and provide solutions such as repair or replacement, ensuring that your furnace operates safely and efficiently.

Electrical Issues

In some cases, a tripped circuit breaker may be an indication of a broader electrical issue within your home's wiring system. Excessive voltage fluctuations, grounding problems, or a faulty electrical panel can all contribute to a furnace tripping the circuit breaker. These underlying electrical issues require immediate attention to prevent further damage to your home's electrical system and ensure the safety of its occupants.

If you suspect an electrical issue, it is crucial to contact a certified electrician as soon as possible. They possess the knowledge, expertise, and tools to identify and rectify any electrical problems within your home, providing a secure electrical environment for your furnace and other appliances.


A furnace repeatedly tripping the circuit breaker can be a frustrating and inconvenient issue to deal with, especially during the cold winter months. By understanding the potential causes such as faulty wiring, overloading, restricted airflow, malfunctioning components, and electrical issues, you can troubleshoot the problem effectively. It is always recommended to consult with professionals such as electricians or HVAC technicians for an accurate diagnosis and safe resolution of the issue. By addressing the root cause of the problem promptly, you can ensure that your furnace operates efficiently, providing a warm and cozy home throughout the winter season.


Just tell us your requirements, we can do more than you can imagine.
Send your inquiry

Send your inquiry

Choose a different language
Current language:English