Identifying the Cause of a Blown Furnace Fuse

HVAC Technician Working on Furnace in Savannah, GA.

One of the most common issues homeowners experience with their furnaces is a blown fuse. A furnace fuse blowing can be caused by a variety of things, and it’s important to know why your furnace is blowing fuses in order to identify and fix the problem properly. Let’s take a look at what could be causing your furnace to blow a fuse.

Loose or Damaged Wiring

Loose wiring can cause arcing or short-circuiting, which can lead to overloads that blow out the fuse on your furnace. It’s important to have all your furnace wiring inspected regularly to make sure there are no signs of wear or damage that could cause problems down the line.


Another possible cause for your furnace blowing a fuse is overvoltage—the voltage supplied by your utility company is too high for your system to handle safely and efficiently. In this case, it’s important to have a professional install an appropriate voltage regulator in order to ensure that the voltage coming into your system does not exceed recommended levels. This will help prevent further issues with blown fuses and other electrical problems in the future.

Clogged Filters

When filters get clogged up with dust and debris, they reduce airflow through the system and cause an increase in air pressure, which can lead to overloads that blow out fuses on furnaces. To keep this from happening, make sure you have your filters cleaned or replaced regularly as part of your regular maintenance routine for your system.

Water Leaks

In order for your furnace to function properly, all water pipes must be connected securely without any leaks that could cause water damage or corrosion of metal components inside the furnace itself—both of which could lead to electrical shorts that blow the fuse. Make sure all water pipes are connected tightly with no leaks present before using your furnace again after replacing the fuse!

Get in Touch With Professionals Today!

Savannah Air Factory is the top choice for heating, cooling, and ductless systems services in Savannah and the surrounding areas. We are committed to excellence and offer hybrid heat services that are second to none. Don’t let your home suffer from inadequate cooling or inefficient heating. Call Savannah Air Factory for outstanding services today.