1, the installation position of range hood is not firm.

Improper installation of the range hood will produce abnormal noise, which is the reason why the range hood and the wall vibrate. At this time, it is necessary to re-fix the range hood and install it reasonably according to the height of the family, subject to not meeting.

2, the exhaust pipe is too long, dead bending phenomenon.

The more bent the smoke exhaust pipe of the range hood, the greater the pressure loss and the smaller the suction force, which is easy to cause poor smoke exhaust. Therefore, the smoke exhaust pipe should be as short as possible and the turning radius should be as large as possible, so as to ensure smooth smoke exhaust, increase smoke exhaust effect and reduce noise.

3. The range hood needs to be cleaned in time.

If you don't clean the range hood for a long time, too much oil will stick to the inner surface of the motor, turbine and range hood, and the weight of the fan will be unbalanced, which will cause the range hood to vibrate greatly.

4. Improper installation of check valve

If it is a range hood with a check valve, it must be checked to ensure that it is fully opened.

5, the air is not circulating

When using the range hood, keeping the kitchen air circulating can prevent the air in the kitchen from forming negative pressure and ensure the suction ability of the range hood.

Analysis of common faults of range hood

1, unable to start after power on.

Cause analysis and treatment: the power cord is broken or the connector is off-welded, carefully find the broken point or off-welded place and re-weld; If the on-off switch is disconnected or has poor contact, check whether the circuit breaker is welded well. If the contact is poor, replace it with a new one.

The starting capacitor capacity of the motor decreases or is short-circuited or open-circuited, so it is necessary to replace the capacitor with the same specification to make the motor run; The variable speed coil is open or short-circuited, and the variable speed coil is repaired or replaced with new products; The bearing is damaged and stuck on the rotating shaft, so the bearing must be replaced; The stator winding is short-circuited or the connecting wire is broken. Repair the stator winding or replace it with a new one.

2. Abnormal sound or loud noise occurs during operation.

Cause analysis and treatment: improper assembly makes the fan blades loose and makes abnormal noise when touching the air guide frame, then reassemble and tighten the fan blade fastening nail correctly; The bearing of the motor is badly worn, so the bearing of the same model must be replaced.

If the motor is poorly assembled, correct the gap between the stator and rotor of the motor to make it uniform. If there is axial movement, an appropriate washer should be added; The deformation of the fan blade is unbalanced, correct the fan blade and adjust the dynamic and static balance of the fan blade; The design of gas outlet pipeline is unreasonable. Turn the air outlet pipe as little as possible, turn it big and round.

3. Excessive vibration of the range hood

Cause analysis and treatment: weak fixation or poor installation, add rubber pad or foam plastic to ensure firm fixation; There are foreign bodies on the blades and the internal scale is too thick. Remove foreign matter and internal dirt from the blade.

The spindle and cutter sleeve are eccentric, and the concentricity of the spindle and cutter sleeve is readjusted; If the motor bearing is worn or the bearing hole is too large, replace it with a new bearing of the same specification; Motor winding is partially short-circuited or open-circuited. Replace the winding or motor.

4. Oil leakage

Cause analysis and treatment: improper installation, insufficient elevation angle, re-installation to maintain a certain elevation angle, so that the sucked oil naturally flows down the oil cup; Or add a filter screen with a certain angle to the air outlet, so that oil drops will not drop under the action of surface tension.

If the sealing strip fails for a long time, add rubber or foam plastic strips at the sealing place to compact the parts and improve the sealing level; If it is not cleaned regularly, the grease in the oil cup should be removed frequently, and the filter screen and pipeline should be cleaned to avoid the overflow of oil fume and grease.

5. The smoke exhaust effect is poor

Cause analysis and treatment: the installation point is too high from the cooker, so the installation point should be lowered appropriately; If the exhaust pipe is too long or the air outlet direction is improperly selected, shorten the exhaust pipe appropriately and re-select the air outlet direction; The sealing strip failed and leaked. Replace the sealing strip to make it seal firmly.

If the internal circulating activated carbon fails, replace it; If the indoor and outdoor pressure difference is too large, open the doors and windows appropriately to reduce the indoor and outdoor pressure difference; If the voltage is too low, a voltage regulator should be configured if necessary; The air intake passage is blocked by oil pollution, so it is necessary to clean up the oil pollution.