1, the fan is used for a long time, and too much dust is accumulated, which leads to the increase of the friction coefficient between the rotor and the bearing, and the rotor is stuck or even stuck, resulting in overheating and damage of the coil; Solution: After power failure, open the back cover of the fan and add a few drops of lubricating oil (such as sewing machine oil). ) to the bearing sleeves at both ends of the rotor, and stir the blade while dripping until the blade is flexible and the fan fault can be eliminated;
2. There may be no 220v AC input or damaged coil; Solution: Turn on the power supply and carefully measure both ends of the power cord with an electric pen. If one end is lit and the other end is not lit, it means that the power incoming line is normal and the fan coil unit may be damaged. If both ends of the electric pen are turned on or off, it means that there is something wrong with the power inlet line and it needs to be repaired as soon as possible;
3. If the fan doesn't turn, but there is a hum at noon. This kind of fault is most common in capacitor-started blowers. The main reason is that the capacitor has no capacity, serious leakage or the starting winding is damaged; Solution: Remove the original capacitor and connect the good capacitor.