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Air Conditioner Keeps Blowing Fuses? Top 6 Reasons Why

Blown fuses are one of the most common electrical problems with A/C units. When your A/C fuse gets blown, it can be very frustrating, especially if you live in a hot and humid area. While a blown fuse is a just protection measure for your air conditioner, it could indicate a bigger problem if it keeps happening every time.

If your air conditioner keeps blowing fuses, it could be as a result of a clogged filter. A clogged filter causes your A/C unit to work overtime and may result in a blown fuse. Other possible reasons include low refrigerant level, faulty capacitor, loose electrical cables, and faulty condenser fan.

In this article, I’ll explain in detail these common causes of blown A/C fuses. You’ll also learn more about how a fuse works and how you can prevent your air conditioner from blowing fuses. And at the end of the article, I’ll let you in on the easiest way to fix an air conditioner that keeps blowing fuses. Let’s get started!

How Does a Fuse Work?

Before I explain the reasons your A/C is blowing fuses, I have to lay the groundwork and briefly explain how a fuse works.

A fuse works as a protective element for electrical appliances against dangerous levels of current. It is made of a thin strip of metal filament or wire, usually in a glass, ceramic, or metal casing. You can find the fuse in the disconnect box (also called the A/C switch box or fuse box).

During a normal working cycle of your device, the fuse allows current to pass through the wire or filament. However, when there is an overload of electricity, the wire heats up so much that it melts, breaks the circuit, and stops electricity flow. 

A blown A/C fuse is usually an indication of a problem in the electrical circuit. When a fuse blows, the fuse itself is not the problem since its primary function is to protect the appliance and prevent electrical hazards. So, if your A/C keeps blowing fuses, you would need a professional to investigate the problem in your electrical circuit and provide a permanent solution.

That said, it’s always worth understanding why your A/C may be blowing fuses. This article will show you possible reasons why your unit keeps needing replacement fuses in the next section.

What Causes Your A/C Fuse To Blow?

There are several reasons why A/C may be blowing fuses in the circuit board. Some of them are connected and could be a sign of something more serious. Here are 6 of the most common reasons:

Clogged or Dirty Filters

A dirty filter is one of the most common causes of a blown A/C fuse. When your filter is dirty, it can put your air conditioner under continuous pressure and cause it to work harder. The increased pressure on the system can cause it to overheat and eventually trip the circuit breaker or blow a fuse.

A blown fuse due to a dirty filter is usually common during the warm weather seasons when your AC has to work extra hard to push conditioned air through the filter. A dirty filter puts even more pressure on the system, which blows a fuse as a precautionary measure to protect itself.

Loose or Faulty Cables

Loose or partially exposed cables in your A/C or circuit box can cause a short that blows a fuse. Loose electrical connections can result from poor installation or wiring. It can also be as a result of temperature changes that cause the cables to contract and expand. 

If your A/C is blowing fuses because of loose cables, you would need to contact a professional immediately as it presents a potential electrical hazard. In some cases, you can fix the problem by tightening the wires back in place. Other situations may require the replacement of the cables.

Faulty Capacitor

Your air conditioner has a capacitor that helps to regulate the electrical current flowing through the condenser. If the capacitor is faulty, it will allow too much current to pass through and keep blowing fuses if you don’t replace it. Detecting a capacitor problem can be difficult if you don’t have any experience with electrical connections, so you’ll need to have it checked by a professional.

Low Refrigerant

If your A/C’s refrigerant level is low, the device will work harder to maintain the room’s set temperature. This extra work by the system can cause an overload and blow a fuse or trip a breaker. So, as long as the refrigerant is not at the proper level, the air conditioner will keep blowing fuses.

A low refrigerant level can indicate a leak somewhere. This problem mostly occurs if you have an older system. If your unit is blowing fuses due to a low refrigerant level, you’ll need to call an expert to take a look at it and top it up.

Condenser Problems

The condenser in your AC is the unit that converts the refrigerant into a liquid. Within this unit, a fan blows cool air over the condenser to keep it cool. This fan is usually called the condenser fan. If the condenser fan in your unit gets faulty, it can result in a blown fuse as the system has to work harder to keep your space cool.

Dirty condenser coils can also cause the fuse to blow as it puts extra pressure on the capacitor, which now has to run overtime. This problem can be easily fixed by a professional.

Low-Capacity Fuse

Fuses have different voltages and ratings that indicate the capacity of electricity they can handle. If your replacement AC fuse is of lower capacity, it can blow as it cannot bear the load of the unit and intensity of the circuit. If you keep replacing it with the same low-capacity fuse, they will continue blowing until you use one with a higher rating.

How To Keep Your AC From Blowing Fuses

As mentioned earlier, if your air conditioner keeps blowing fuses, it could be a sign of a bigger problem. Most of these problems would require the attention of a professional to keep your AC unit working efficiently. That said, there are a few things you can do to avoid fuse-related problems.

Clean Your AC Filters

Maintaining your AC filters can go a long way in preventing another blown fuse. To clean the filters, wash them under running water. If they are grimy, clean them in warm with a mild detergent. Replace the filters if cleaning them is not an option or you notice any damages or tears. 

If you need more help cleaning your filters, here’s a quick video to guide you:

Maintain the Outdoor Unit

Regularly remove debris, dirt, grass clippings, and leaves from your outdoor unit. A clogged outdoor unit can prevent your air conditioner from working efficiently, so regularly inspecting it is crucial. A firm brush can come in handy when cleaning your outdoor unit. You can also use a water hose spray to remove leaves, grasses, and dirt.

Regularly Inspect Your AC Unit

Have a professional inspect your AC at least once a year, ideally before the beginning of the warmer months. A thorough and overall inspection will help you identify and fix any potential issues and keep your unit in good working condition.

The Easiest Fix for an Air Conditioner That Keeps Blowing Fuses

If you don’t have the time or expertise to troubleshoot and fix an air conditioner that keeps blowing fuses, the smart decision — as you know — is to hire a A/C repair expert to fix it for you.

The problem is that finding a trustworthy and affordable repair service — and actually booking an appointment with them — can feel like pulling teeth.

Some services never call you back. Others charge criminally high rates. The best options are often booked out for months… and the worst don’t even fix your oven. (But they charge you for it anyway.)

To save you from that teeth-grinding frustration and bring you fast and affordable repairs from top-rated pros, I’ve partnered with a company called Networx. They work with thousands of contractors across the United States, and they make it easy for you to get free air conditioner repair quotes from the best repair services near you.

Here’s how it works in 7 easy steps:

  1. Go to the form below.
  2. Select your type of air conditioner in the dropdown menu. Options include Central A/C Repair, Ductless (Mini-Split) A/C Repair, and Window A/C Unit Repair
  3. Add some basic contact information and a brief description of your problem. (Your information will only be used to provide you with A/C repair quotes.)
  4. Click the “Get Free Quotes” button when you’re done.
  5. Our repair service partner will contact multiple vetted A/C repair experts near you. They’ll explain your problem and ask each service to contact you with a free quote.
  6. You’ll receive an email or phone call with repair quotes from each service. You can choose the most affordable option and schedule your repair directly with them.
  7. They’ll come to your house and fix your oven. Problem solved!

Using this form to find the best repair rates is 100% risk-free. There is zero obligation to hire any of the vetted contractors who contact you.

Fill out the form now to get free quotes from trusted A/C repair services in your area.


  • Steve Rajeckas

    Steve Rajeckas is an HVAC hobbyist with an avid interest in learning innovative ways to keep rooms, buildings, and everything else at the optimal temperature. When he's not working on new posts for Temperature Master, he can be found reading books or exploring the outdoors.

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