How to repair a household fan

If a domestic fan breaks down, both a desktop and an outdoor fan, do not rush to immediately carry it in for repair, let alone throw it out. Most likely, there was a simple malfunction, and you can repair the fan yourself.

Main malfunctions

The household fan is not distinguished by the complexity of the design, and the principle of its device can be seen in the figure below.

If you look closely at the picture, it becomes clear that a motor, a gearbox, a crank, a rotation speed switch and a propeller that creates airflow can fail in the apparatus.

The main difference of the desktop cooler from the floor is the high rack in the floor version. The rest of the construction is identical.

So, the main faults that you can observe from the cooler you purchased:

• the unit does not turn on, the mains light is off;
• the device does not work, but the light is on;
• the blades of the cooler do not rotate well;
• the unit does not turn to the sides;
• cooler makes a buzz and does not rotate.

The unit does not turn on

In this situation, there can be 2 options: a light bulb, indicating that the unit is ready for operation, can light up or not. Depending on this, the algorithm for diagnosing a breakdown will be different.

The light is off

If after turning on the device in the socket the light bulb located on its case does not light up, and it does not start, then first of all, it is necessary to check whether voltage in the outlet. This is done simply: take any electrical appliance and turn on this outlet. If the device is working, then you need to look for a fault in the electrical plug and cord.

To check the plug, unscrew it and check that the wires are connected to the terminals. To check the cable,It is necessary to disconnect it from the terminal block of the device and “ring out” the tester. If a break is found in the cable cores, it should be replaced.

Light bulb is on

The reason for this behavior of the unit, when the indicator light is on, but the fan does not work, and no sound is heard, can be caused breakdown of the block with buttons. To check the buttons, you will need to disassemble the push-button unit located on the stand of the floor fan or stand on the desktop unit. But, before you disassemble the device, make sure that it is unplugged from the outlet.

The operation of the buttons is very simple: there is an “on” and “off” position. It is necessary to use a tester to check the “output” and “input” on each key.

If a defective button is found, it will not be repaired. Therefore, the switch should be replaced or make the connection directly. Such an approach to solving a problem will help to start the unit into operation, if you are far from the store, for example, at the cottage.

Faulty speed switches may also be the reason why the fan does not turn on. To test the regulator, you need to put it in the maximum position and check the “input” and “output” using the same tester.

The blades of the cooler do not rotate well

In the case when the fan does not pull and badly drives the air, you will need to disassemble the case in which the motor is located. Sometimes the fact that the propeller does not spin can signal a lack of lubrication in the sliding bearing installed in the electric motor.

Disassembly of the fan is as follows.

1. First you need to unscrew the protective grid (front part) and remove it.
2. After the grid, detach the propeller. It can be bolted to the motor shaft with a nut with a left-hand thread. That is, to unscrew the nut, rotate it clockwise, and for its tightening - counterclockwise.
3. Remove the rear safety net by unscrewing another nut.
   

4. Unscrew all fasteners holding the casing of the unit. Sometimes in the handle to adjust the rotation of the body is another bolt. If you do not unscrew it, you will not be able to remove the motor cover.
5. Now that the engine is open, you should drop a few drops of engine oil (it is better to use spindle oil) on the sleeve (indicated by the red arrow) and turn the shaft several times in different directions so that the lubricant is absorbed inside.
   
6. After this procedure, the shaft rotates slightly. Assemble the motor housing in the reverse order.
7. Turn on the unit and check the air flow.

The fan does not turn to the sides

How to fix the floor fan if it stopped spinning (turning) on ​​the sides? It's all about crank, the mounting screws of which can be loosened or unscrewed. To find out, you need to disassemble the motor housing. If during the operation of the unit turns of the body occur with a delay or a full stop, then you should check gears in gear on the subject of gearing. It is also necessary to check the gearbox switch itself, namely, moving it up and down.

Disassemble the gearbox and remove the main gear. The shaft will also have to pull out. Lubricate all moving parts and assemble the gearbox. If the gears are badly worn, they require replacement, although it is rather difficult to find analogues of broken parts for the fan. In this case, you have to assemble the unit without a gearbox and use the cooler as usual, when the air masses will move in one direction.

The cooler makes a buzz and does not rotate.

Cases when the fan does not turn, and at the same time the motor hums, meet quite often. There can be several reasons for this breakdown:

• lack of lubrication on the bearings (what to do, as stated above);
• condenser failure;
• motor malfunction.

Condenser failure

Repair of the floor fan in this case comes down to checking capacitor capacitance using a tester. To get to the radio, you will need to disassemble the motor housing. A detailed description of how to disassemble the case was given above. After removing the cover, you will see a capacitor mounted on the engine.

The presented device has a capacitor capacitance of 0.85 microfarads. For this reason, the device must be set to a value ranging from 2 microfarads to 200 nanofarads, as shown in the figure below.

In this case, after connecting the capacitor to the device, it is clear that its capacity is equal to 0.841 microfarads. If we take into account the error of ± 5%, then the capacity of the radio component is within the normal range, and it is not the reason that the cooler stopped working.

Engine malfunction

When repairing the fan with your own hands, in search of breakage it is also necessary to “ring out” the electric motor. If it is faulty, the device will not turn on and will emit a buzz. It is necessary to measure the resistance on two stator windings, after disconnecting the wires to them, as shown in the following figure.

As can be seen, the resistance is also within the normal range, since its value is equal to 1215 ohms (1.2 kΩ). Otherwise, the device will sound, but will not turn on. In such a situation, the engine will need to rewind in a special workshop.

The device is very noisy

Since the propeller of the unit, whose main task is to create air flow, is made of plastic (not always of high quality), the probability of deformation of the latter is high. This usually happens when the unit is left for a long time in direct sunlight, or near a heat source. When deformed, the equilibrium between the blades is disturbed, which causes a strong vibration and noise during normal air flow.

Also, the vibration of the shaft may appear due to the sleeve of the sliding bearing loose from long-term operation.

Often when the machine falls, when the blades are spinning, protective grid is deformed. When a rotating propeller is hit on it, one of the blades may break.

Summarizing, we can say that in different models of fans the main nodes and control elements may look different.But the principles of diagnostics and troubleshooting do not change.

The most reliable fans of 2018

Table fan Mystery MSF-2428