Trystan Casey
Electric fans are a great way to keep cool, but what happens when they stop working? In this guide, we will explore some common issues with electric fans and provide step-by-step instructions on how to fix them. From lubricating the central pin and bearings to cleaning the vent and motor case, we will cover the most effective ways to repair your electric fan and get it spinning again. We will also discuss safety precautions to consider when working with electrical appliances and offer troubleshooting tips for more complex issues, such as a broken shaft or a faulty capacitor. So, whether your fan is making strange noises or has completely stopped functioning, read on to discover how you can fix your electric fan and stay cool!
How to fix a broken electric fan
| Characteristics | Values |
|---|---|
| Common issues | Fan blades aren't spinning, the fan is making noise, or the fan is not receiving an electrical signal |
| Possible causes | Poor lubrication, blockages in vents, broken coil wires, damaged capacitor, scratch on the shaft, dust and heat trapped inside the motor case |
| Tools and materials | Philips screwdriver, disposable gloves, long-nose pliers, hammer, tape, bushing, shaft, cutter pliers, absorbent cotton, oil, soldering equipment, electrical tape, capacitance meter or multimeter, polystyrene, plastic bottle, paper and plastic scotch tape |
| Steps | Unplug the fan, disassemble the fan, lubricate central pin and bearings, clean the vent and motor case, replace any broken parts, solder wires, insulate wires, reassemble the fan, check if the fan is working |
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What You'll Learn
Disassemble the fan and lubricate the central pin and bearings
To fix a broken electric fan, disassembling the fan and lubricating the central pin and bearings is key. This process can help address issues such as the fan not spinning or making excessive noise. Before beginning, ensure the fan is unplugged from any power source to avoid accidental activation.
Firstly, carefully disassemble the fan by removing the blade guard or unscrewing the pin. This may involve unhooking clips that hold the blade guard together or turning the circular center of the fan counterclockwise. Once the fan is disassembled, the central pin and bearings will be accessible.
Next, inspect the central pin and bearings for any signs of damage or wear. If the pin is scratched or damaged, it may need to be replaced. Clean the central pin and bearings to remove any dust or debris that could hinder their performance.
Now, it's time to lubricate the central pin and bearings. Gather a suitable oil, such as machine oil or a specific oil designed for high-speed motor shafts and bearings. Avoid oils containing detergents, as these can be detrimental to the bearings of fan motors. Using a small amount of oil, carefully lubricate the central pin and bearings.
Finally, reassemble the fan by securing the blade guard or screwing the pin back into place. Ensure all components are securely attached before plugging the fan back into the power source and testing its performance.
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Clean the vent and motor case with compressed air
To clean the vent and motor case with compressed air, start by unplugging the fan and removing the vent cover by unscrewing it. Hold the vent cover away from the motor and spray both sides with compressed air to remove dust from the spaces between the vent's bars. You can buy compressed air from hardware stores or online. If you don't have compressed air, you could try using a hairdryer on a cool setting to blow the dust away. Ensure you are not blowing dust back into the fan. Alternatively, you could vacuum the vent with a soft brush attachment.
Once you have removed the built-up dust with compressed air, wipe the cover down with a dry cloth. If your vent is caked in dust or debris, this could be the reason your fan isn't working properly.
If your fan is still not working, you may need to disassemble the fan and clean the motor case with compressed air. Be careful when disassembling the fan, as it is easy to break components when taking it apart. You may need a screwdriver to disassemble the fan. Once you have removed the outer casing, use the compressed air to clean the motor case, being careful not to get dust on other components.
If your fan is still not working, you may need to replace some of the internal components. For example, you may need to replace the shaft and bushing if they are damaged. You can buy replacement parts from electronic stores or online. You can also use a 3D printer to create replacement parts, but this requires access to a 3D printer and modelling software.
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Check the capacitor with a capacitance meter or multimeter
The capacitor is a small black box with two wires coming out of it. Its function is to create a phase difference between the stator voltage and the rotor voltage, which creates the torque in the motor. If you want to check the capacitor, you can do so with a capacitance meter or a multimeter.
First, remove one of the wires. Then, put a short across the capacitor with a wire or alligator lead for 30 seconds to remove any residual voltage and protect your meter. Ensure that your meter is on at least the 1K setting. If the capacitor slowly charges up, it is functioning correctly. If it does not charge, your capacitor is faulty and will need to be replaced.
You can replace the capacitor with another non-polarised capacitor, or you can create your own by using two electrolytics with the two positive leads connected together. When replacing the capacitor, ensure that the voltage rating is at least 250 volts or higher, and the capacitor should be at least 4uF. If you are making your own capacitor, use electrolytics that are at least 8uF each, as capacitance halves in series.
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Repair a broken shaft with a replacement or 3D-printed part
If your electric fan has a broken shaft, you can attempt to repair it by replacing the shaft or using a 3D-printed part. Here is a step-by-step guide to help you through the process:
Step 1: Assess the Damage
Before starting any repairs, it is important to identify the root cause of the problem. In this case, a scratch on the shaft is causing the fan not to work properly and has also damaged the bushing.
Step 2: Obtain Replacement Parts
You can either purchase a replacement shaft and bushing from an electronics store, as mentioned in the source, or you can create a 3D-printed replacement part. If you choose to 3D print the part, you will need to obtain the precise dimensions of the broken shaft and create a 3D model using software such as Autodesk Fusion 360. Once you have the model, you can print it out using a 3D printer.
Step 3: Prepare for Repair
Before beginning the repair process, ensure you have all the necessary tools and materials. If you are using a replacement shaft, you will need tape, a hammer, and the new shaft and bushing. If you are using a 3D-printed part, ensure that your 3D-printed shaft is strong enough to withstand the fan's operation and that it fits perfectly with the other components.
Step 4: Disassemble and Replace
Start by removing all the spacers and carefully disassembling the fan. If you are using a replacement shaft, wrap tape around the end side of the rotor to guide you in placing it on the new shaft. Then, use a hammer to gently tap the end of the shaft until it is securely in place. If you are using a 3D-printed shaft, follow similar assembly instructions, ensuring a secure fit.
Step 5: Test the Fan
Once you have replaced the shaft and reassembled the fan, it is time to test it. Plug in the fan and turn it on to check if it is now functioning properly. If the fan works, congratulations! You have successfully repaired your electric fan. If not, you may need to reassess the issue and consider seeking professional help or purchasing a new fan.
Remember to be cautious when working with electrical appliances, and always unplug the fan before beginning any repairs.
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Check the fan in multiple outlets to rule out electrical issues
If your electric fan is not working, it is important to check the fan in multiple outlets to rule out electrical issues. This is because it is possible that the circuit breaker on an outlet was flipped, preventing the fan from receiving an electrical signal.
To do this, unplug the fan and put it in a different outlet. Ensure that the fan is securely plugged in, then turn it on and observe whether the blades are moving. If the fan still isn't working, try plugging it into another outlet. You can also try plugging in another electrical device into the same outlet to see if it works, which would indicate that the issue is with the fan itself, rather than the outlet.
If you've tried multiple outlets and the fan still isn't working, there could be another issue with the fan. You may need to open the fan and check for any blockages, dust, or heat damage. If the fan is making a humming sound but the blades are not rotating, there could be an issue with the motor or the capacitor.
In some cases, you may need to disassemble the fan to identify and fix the issue. This could involve checking the coil wires, lubricating the motor, or even replacing parts such as the shaft or bushings. If you are comfortable with basic mechanical repairs, you can try to fix the fan yourself. However, if the problem is with the motor itself, it may be more cost-effective to simply buy a new fan, as electric fans tend to be inexpensive.
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