Common faults of fume hoods and their solutions

The common faults of fume hoods and their solutions mainly include the following aspects:

First, power failure

Phenomenon: The fume hood fails to start and the power indicator light is not on.

Solution:

Check whether the power plug is properly inserted and whether the power cord is damaged.

Confirm whether the power switch is turned on and check whether the power line is properly connected.

Use a multimeter to measure the power supply voltage and ensure it is within the rated voltage range of the fume hood. If the voltage is too high or too low, check whether the power supply is normal. Install a voltage stabilizer if necessary.

Second, motor failure

Phenomenon: The fume hood fails to start or the air velocity is insufficient.

Solution:

Check if the motor is damaged. If it is, replace the motor.

Check whether the motor circuit is faulty, such as whether the circuit connection is correct, and repair or replace the damaged circuit.

If the motor bearings are worn out or the fan blades are unbalanced, causing excessive noise, the bearings need to be replaced or the blade balance adjusted.

Third, control system failure

Phenomenon: The fume hood fails to start, and the control panel shows no response or abnormal display.

Solution:

Check if the control panel is damaged. If it is, replace the control panel.

Check if the sensors are faulty, such as temperature sensors, humidity sensors, etc. Clean the sensor probes and calibrate or replace the faulty sensors.

Check whether the connection lines of the control panel are loose or have poor contact. Reconnect or replace the connection lines.

Fourth, fan failure

Phenomenon: The air velocity of the fume hood is too low or the fan does not rotate.

Solution:

Check whether the fan speed is normal. If the speed is too low, adjust the fan speed or replace the fan.

Check if the fan blades are damaged. If so, replace the fan blades.

Check whether the power connection of the fan is normal, including whether the power cord of the motor is loose and whether the contact is good.

Fifth, the air duct is blocked

Phenomenon: The air velocity of the fume hood decreases.

Solution:

Regularly clean the air ducts of the fume hood to remove dust, debris and other blockages. Vacuum cleaners, brushes and other tools can be used for cleaning.

Sixth, the filter is clogged

Phenomenon: The ventilation effect of the fume hood is poor.

Solution:

Check if the filter of the fume hood is clogged. If it is, clean or replace the filter in time.

Seventh, the cabinet door is not closed tightly

Phenomenon: The cabinet door is not sealed tightly, which may lead to indoor air pollution.

Solution:

Reinstall the threshold or adjust the cabinet door hinges to adjust the position of the cabinet door.

Replace the threshold and sealing strips to ensure a tight seal of the cabinet door.

Eighth, communication failure

Phenomenon: The fume hood cannot communicate normally with the upper computer or other equipment.

Solution:

Check whether the communication lines are connected properly, including whether the communication lines are loose and whether the plugs are inserted properly.

Check whether the communication protocol is set correctly to ensure that the communication protocols of the fume hood and the equipment communicating with it are consistent.

Check whether the communication module is working properly. If there is a fault, replace the communication module.

Ninth, other malfunctions

Phenomena: such as fluorescent lamps not lighting up, excessive noise, etc.

Solution:

For the problem of fluorescent lamps not lighting up, check whether the lamp tubes or relays are damaged and replace the damaged parts.

For the problem of excessive noise, check whether the fan bearings are worn and whether the air ducts are resonant, and take corresponding repair measures.

When dealing with fume hood malfunctions, it is necessary to ensure safe operation to avoid accidents such as electric shock and poisoning. If you are unable to solve the malfunction by yourself, you should contact professional maintenance personnel in time for repair. Meanwhile, regular maintenance and upkeep of fume hoods are also important measures to reduce the occurrence of malfunctions.