Furnace Breaker Trips - Furnace breakers most often occur for a few reasons:
a bad circuit breaker
a bad furnace fan motor or component
poor airflow through the furnace
Let’s explore these reasons in detail and find out what you can do to fix a furnace breaker trip. Or perhaps you need to call for service to have the furnace breaker trip repaired? Whether you need to call for service or not there are some simple remedies you can do to check the system and possibly fix it yourself. We begin the basics first and move to the more complicated things.
Furnace Breaker Trips
Poor Airflow through the Furnace
This can be the result of a dirty air filter. The furnace blower motor has to work harder to move air when you have a dirty air filter. Therefore, always check your air filters to ensure they are clean and not loaded up with dust and debris. Other problems that can cause poor airflow through your furnace are:
Collapsed ductwork - in this case, you have a question. Has anyone done any work where the ductwork is located? Maybe the cable installer? Pest control? These things have happened before and they can result in poor airflow and lead to other problems like a furnace breaker tripping.
If there was no filter in the system it is possible the evaporator coil could be loaded up with dirt and debris. Everything the filter should have stopped ended up in the air conditioner evaporator coil.
Insulation inside the cabinet or the ductwork came loose and it blocks airflow.
Amperage and Circuit Breakers | Furnace Breaker Trips
All of these things can create poor airflow and that results in the fan motor working harder. When the fan motor works harder it pulls more amperage. Circuit breakers will trip when they reach a certain temperature based on the rating of the breaker. When a fan motor pulls more amperage through the circuit it creates more heat. That extra heat can cause the breaker to trip. The fix starts with checking the air filter and then checking everything else if you think airflow is the problem.
Bad Circuit Breaker
A bad circuit breaker can be causing the furnace breaker to be tripping. Unless you know what you are doing this will require the services of an electrician or HVAC technician. Breakers do go bad from time to time and cause nuisance trips. The fix is to replace the breakers.
Breakers can also go bad because they have a loose connection in the panel. A loose electrical connection causes extra heat from electrical arcing. The extra heat melts things and the problem gets worse. Call for help if you don’t know what you are doing. This will require you to open the breaker panel where there is high voltage.
Bad Furnace Blower Motor or Component
Sometimes the furnace blower motor or a motor component can cause the problem of circuit breaker tripping. The component here would be either a bad capacitor or a loose connection to the motor from the relay or circuit board. This can easily be rectified by check the electrical connections or testing the capacitor. This should be done by only a technician who has been trained to do it because it deals with high voltage. Motor windings or bearings could also be going bad causing the motor to pull extra amperage. In either case, a professional should be consulted for the repair. They will have the knowledge, tools, and skill to make the repair.
Conclusion | Furnace Breaker Trips
Some of these things can be checked by you but other things need to be checked by an HVAC professional. We have another basic list you can check located here.
Furnace Breaker Trips
Reader FAQ for Furnace Tripping the Circuit Breaker
Why is my breaker tripping repeatedly?
Typically this problem occurs because of an overloaded circuit or a breaker that is bad. It is possible you have a short circuit and ground fault protection issue. If it is a newly installed furnace, call the HVAC contractor that installed the new furnace.
What size of breaker should my furnace use?
Furnace breaker size depends on the ampacity of the furnace. This varies from furnace type to furnace type. An electric furnace will use a larger size (rated in amps) breaker than a gas furnace. The maximum amp values for your furnace should be noted on a nameplate on the furnace. If in doubt, always consult a professional. Using the incorrect sizes for electrical equipment can result in a dangerous fire condition.
My furnace breaker tripped and won't reset?
It is possible you have a short circuit or ground fault protection issue. See FAQ #1 for more info.
HVAC Tip - Air Conditioner & Heat Pump Tips: Additional Helpful Hints:
Always change your air filter on a monthly basis
Make sure all your supply vents are open and unobstructed
Keep area clean around indoor unit especially the return grills
Keep outdoor units free of leaves, grass, and debris including trash cans and/or children's toys or playthings like small plastic pools or playhouses.
Additionally your service technician will appreciate you not planting holly bushes near the outside unit
Lastly have system serviced every six months - once for heating and once for cooling before the season starts
This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Cookie settingsACCEPT
Privacy & Cookies Policy
Privacy Overview
This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.