Whether to replace it depends on the actual situation. It is recommended to replace the range hood if the following situations occur: first, it has been used for more than 8-10 years, and core components such as the motor and fan impeller are severely aged, resulting in high maintenance costs and performance that cannot meet the daily smoke exhaust needs; second, it frequently malfunctions (e.g., frequent motor damage, severe oil leakage, excessive noise), affecting normal use; third, it has high energy consumption—compared with new energy-saving range hoods, old ones consume more electricity, which is not cost-effective for long-term use; fourth, it does not meet the current environmental protection standards, with poor smoke exhaust effect and inability to effectively purify the kitchen air, endangering the health of family members.If the performance decline is only slight and can be improved through cleaning and simple maintenance, and the service life is relatively short, you can temporarily not replace it. However, regular inspection and maintenance are required to ensure safe use.

To clean the surface oil dirt, first wipe it with a damp cloth dipped in warm water and detergent. If the oil dirt is stubborn, spray a small amount of special oil stain cleaner on the cloth and wipe gently (be careful not to let the cleaner enter internal components such as the motor). To clean the internal oil dirt (e.g., oil filter, fan impeller), remove the oil filter, soak it in warm water with detergent for 30 minutes, and then scrub it with a brush. For cleaning the fan impeller, turn off the power, open the housing, spray a special oil stain cleaner on the impeller, let it sit for 10-15 minutes, and then clean it with a soft brush. Avoid damaging the fan impeller blades during the cleaning process.

When the range hood is running, the motor will generate a certain amount of heat, so slight heating of the body is normal. However, if it gets extremely hot (even too hot to touch), it is an abnormal situation. Possible causes include motor overload (e.g., blockage of the fan impeller or unsmooth pipe leading to excessive motor load); poor motor heat dissipation (e.g., the heat dissipation holes are blocked by oil dirt, making it impossible for heat to escape); and short circuit of the motor coil, which intensifies heating.

Possible causes include damaged buttons (e.g., oxidation or wear of the internal contacts of the buttons); poor contact of the button connection lines (e.g., loose or disconnected lines); and faults in the internal control board of the range hood, which cannot receive the button signals.

The main possible cause is a faulty check valve: for example, the valve core of the check valve is stuck by oil dirt and cannot close, leading to oil smoke backflow from the public flue; improper installation of the check valve resulting in poor sealing; or poor sealing at the interface between the smoke exhaust pipe and the public flue, with gaps existing.

Possible causes include a damaged bulb (the most common case); poor contact of the lamp holder, such as loose connection between the bulb and the lamp holder or oxidation of the lamp holder; and faults in the internal lighting circuit of the range hood, such as poor line contact or a burnt fuse.

Possible causes include the oil cup not being installed in place, causing oil dirt to leak from the gap; the oil cup capacity being too small to meet the daily oil collection needs; blockage of the internal oil circuit of the range hood, preventing oil dirt from flowing into the oil cup smoothly and instead leaking from other parts; and infrequent cleaning of the oil filter, leading to oil dirt dripping outside the oil cup directly.

Possible causes include power supply issues, such as loose plugs, faulty sockets, or tripped circuits; damaged range hood switches that cannot transmit the start signal; motor failures, such as burnt coils or damaged capacitors; and the motor being stuck by oil dirt and unable to rotate.

Possible causes include excessive oil accumulation on the fan impeller, which causes the center of gravity to shift and generates vibration and abnormal noise during rotation; deformation, breakage of the fan impeller blades, or friction between the blades and the housing; wear or lack of oil in the motor bearings, resulting in noise during operation; and unstable installation of the range hood, causing overall vibration during operation.

There are mainly four possible causes: first, the oil filter is clogged with oil dirt, preventing oil smoke from entering the air duct smoothly; second, the fan impeller is covered with a large amount of oil dirt, reducing its rotation speed and weakening the smoke exhaust capacity; third, the smoke exhaust pipe or check valve is blocked, making it impossible for oil smoke to be discharged; fourth, the motor power is insufficient or the motor is faulty.