What Causes a Ceiling Fan Capacitor to Fail | 6 Reasons You Must Know


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What causes a ceiling fan capacitor to fail? Ceiling fans are now seen in many homes. It is a great method to keep your house cool in the summer, especially if you live in an existing house without integrated climate conditioning. One of the most typical causes of capacitor failure in ceiling fans is that they begin to operate slower than usual. This article will assist you in determining what is causing the issue and ways to resolve it.

What Causes a Ceiling Fan Capacitor to Fail?

What Causes a Ceiling Fan Capacitor to Fail

Overloads of energy and overvoltage

Voltage saturation or power surges in the house are among the most prevalent reasons for battery breakdown. The resistive element is usually turned off as a failure guard when the fan motor exceeds the set speed to avoid overheating or other operational harm. If the engine fails to start, an energy overload may occur.

These short circuits can speedily harm the circuit, as every voltage used beyond the capacitor’s maximum or “top speed” can likely kill it. Voltage shocks can also be produced by external wiring or lightning storms.

Age and overheating

The essential purpose of a rooftop cooling fan is performed by capacitors, which are remarkably responsive gadgets. Internal components wear down and fail with time, and they may become exhausted for normal regular use.

The air compressor taking longer to close rather than a quick ramp down for a few seconds is one clue that the battery is beginning to fail. It can lead the motor to lag and the capacitor to overheat. Oil leaking is another symptom of capacitor deterioration (also known as “motor lubricant”).

Once your electric fan’s resistor is causing it to operate slowly, you should it should be changed by an expert technician. When you have an idea about electrical, you can repair this device in an extended time by yourself.

Unbalanced blades causing vibration

The propellers of a rooftop fan’s capacitor may eventually fall out of balance as it develops. It might be any or all of the fan blades. Unbalance can also be caused by bent or broken blades.

To see whether the blades are crooked on the source of your fan’s sluggishness, climb the stairs and examine the propellers together.

Whether any edges are broken, you may address the problem by Changing or restoring the propellers when they are strained. If the harm is beyond repair, it is suggested to change the complete blade. Blades are positioned at a different angle than the rest.

The fan might cause instability. It can result from a manufacturer’s shortage of skilled control (or a shoddy homemade blade removal) and could be compensated under insurance.

Faulty bearings

The collection of debris, grit, and particles inside the moving parts causes the condenser of a blower to slow down over time (most of them have two gears).

Oil and grime collected inside the gear might make it difficult to move the blades after some time. If the axles are coated with oil or debris, clean them carefully with a moist towel (or a sharp scraper).

Before you begin, make sure the blower is turned off. Put it away after cleaning it and enabling them to fully cool (if you are using a cleaner) before reinstalling it. To avoid harming components, use extreme caution when cleaning bearings. It’s also good to clean off the fan blades to keep loose debris off the wind.

If the speed does not alter, you can change it entirely once the axles have been brushed.

Unfastened screw

The loosening of the bolts is an issue that might cause the ceiling fan condenser to fail. It is prevalent with blowers when correctly installed. Listen for any sounds emanating from the propellers to diagnose the problem. In setting up a fan, ensure the bolts are securely fastened. After the fan has started, unsecured screws might pose a significant safety risk.

Loss of lubricant

Lubrication interior of the ceiling fan capacitor motor is critical to efficient and effective activity. Moving elements within an engine might dry up and cease functioning if they are not lubricated. For the most part, lubrication works the same way grease does in a vehicle powertrain or any other form of machinery equipment.

Coolant hoses from old fans or fans with defective motors cause internal parts to work extremely hard. To discover the time to add lubrication to the blower motor, see the operating handbook that came with the blower. The technique normally begins with removing the bulb housing and fan motor, followed by applying pressurized lubricant to the fan hinges or engine.

Instructions for Replacing the Ceiling Fan Capacitor

What Causes a Ceiling Fan Capacitor to Fail
  • After opening the case, place the replacement capacitor on the workbench. Make sure you have everything you need for the job. Tools needed include a screwdriver (with a head that fits the screws on the fan), a tape measure, a voltage tester, a wire stripper or wire cutter, and wire clips.
  • Turn off the electricity in the room where the ceiling fan is located by activating the switch on the house’s electrical panel or removing the necessary fuse from its location.
  • Move the ladder to under the fan and pull it out high enough to easily reach the fan.
  • Remove the fanlight to access the junction box where the capacitor is located. You can simplify this process by disassembling the motor and placing it on a workbench or stand.
  • Disconnect the power cable from the capacitor and set it aside.
  • Take the new capacitor and connect it to the wiring according to the instructions supplied with the kit. Ensure that the wiring is configured correctly, as incorrect settings can lead to fire and malfunction.
  • Reassemble the motor and place it back in the junction box.
  • Replace the lighting and then switch the room back on to check it is working.

Frequently Asked Questions

Can a ceiling fan work without a condenser?

No. A capacitor interior of the ceiling fan is needed to start the fan motor and keep it running, although if you individually move the turbine, it will stop moving after a few seconds. The ceiling airflow may spin continuously because the resistor creates a flux.

What is the expected lifespan of ceiling fans?

Typically air conditioning units endure between 7 and 10 decades when they break down. If properly maintained and not misused (for example, if it runs continuously), a blower can operate over many decades. Furthermore, some fan blade manufacturers include replacement components and one to two additional guarantees.

What’s the best way to fasten your fan?

When the blower is operated through a controller, you may simply modify the settings with the controller. Whenever you need support, you should also review the instruction manual. If you don’t have a controller, alter the Buttons that spin. Its controls are often found on the base of the fan gear or within the upper ring.

What happens if the ceiling fan capacitor is defective?

The condenser is usually a black box inside the fan junction box. If the case looks burnt or melted, this is also a symptom of a defective capacitor and should be replaced. Be aware that there may be other components in the faulty capacitor circuit.

What happens if a capacitor breaks down?

Half of the capacitors may open during a failure, resulting in a total loss of capacity. Or half of the capacitor may fail, which will lead to a decrease in the total capacitance by half. However, this leads to an increase in temperature, which leads to an increase in internal pressure.


The ceiling fan capacitor failure has just a few causes. Look for the above factors. If your fan’s capacitor isn’t spinning rapidly, check in case you can properly address the problem. You can also contact a good operator to assist you.

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