![]() ![]() If you see a voltage reading on the “line” side but not the “load” side, it means you have a blown fuse. You should again see a reading between 220 and 240. Test the load: If you saw a voltage reading during the previous step, run the same test on the “load” side of the fuses.Should no reading appear, there may be an issue with the breaker panel, which your local electrician will need to address. If you see this, it means you have power coming into the disconnect to your fuses. Read the voltage: Your voltage reading should display somewhere in the range between 220 and 240.Place the leads: Take your voltmeter’s wires (leads) and attach them to the lugs (screws) of your disconnect, placing the red lead on the lug of the black “line” wire and the black lead on the lug of the white “line” wire.Set your meter: Before proceeding, set your voltmeter to the voltage (V) setting and ensure the display reads “0” volts.Locate the wires: Once exposed, locate the incoming and outgoing wires by identifying the labels “line” (incoming) and “load” (outgoing).Pop this out to expose the wiring beneath. Expose the wiring: After opening the disconnect, you should see another cover inside that protects the wiring.Open the disconnect: Open the disconnect’s cover either by lifting or swinging it to the open position.Locate your disconnect: There will usually be a gray box mounted to your home near the outdoor condenser unit.That said, let’s dive into the steps you should follow to inspect for a blown fuse using the voltmeter: Be warned - you are working with live electricity and should use extreme caution when troubleshooting your system. The best way to check for a blown fuse is by using a voltmeter. ![]() If you think your air conditioner has blown a fuse, the first sign you’ll notice is that the outside AC unit is inoperable. How Do I Check an Air Conditioner for a Blown Fuse? When temperatures are high and electrical components become loose, the result can be a blown fuse or system malfunction.Īdditional causes for blown fuses in your air conditioner include faulty condenser fans, malfunctioning compressors, improper refrigerant levels, and old age. Loose electrical: You may have loose electrical components within your air conditioner.Always ensure your air filters are kept clean throughout the summer to avoid overheating the system. Dirty filters: When your unit works harder than it should through a dirty filter, it can overheat and cause the fuse to blow.When this malfunctions, it can cause your fuse to blow and your unit to break down. Faulty capacitor: Your capacitor is the component within your condenser that helps regulate electrical current.If your breakers trip and fuses blow frequently, there’s too much amperage in the power line for your systems to handle. Circuit malfunction: There may be a larger problem with your circuit, fuse box, or power supply.Why Does My AC System Keep Blowing Fuses?Īside from excessive heat, air conditioners can blow fuses for a number of different reasons, including the following: If you use a fuse that’s capable of handling higher amperage, this could cause the condenser to break down and could cause irreparable damage to your unit. However, if you’re in a pinch and need to replace a fuse quickly, you can use a fuse that is rated for a lower amperage than what the system is rated. Typically, AC systems use “TR”-type fuses to ensure safe system operation. Fuses are designed to handle a limited amount of amperage based on the maximum amount that the unit is rated for: If more amperage passes through, the fuse will blow to protect the condenser from overheating. What Kind of Fuse Does an Air Conditioner Use?Īir conditioners use fuses as a way to protect the condenser from being exposed to excessive amperage. By understanding why your AC system is malfunctioning, you can better prepare for your cooling service needs and avoid costly repairs in the future. Knowing how to tell if an air conditioner has a blown fuse is part of proper HVAC equipment ownership. This is due to the fact that AC systems rely on fuses to operate, which are more susceptible to blowing out when temperatures are particularly high. When the summer heat is at its worst and you need your air conditioner the most, that’s when you’re most likely to experience a system breakdown. ![]()
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