Magnetic heating stirrer is a commonly used equipment in laboratories, which integrates stirring and heating functions. However, long-term use is prone to various malfunctions. The following are common problems, causes, and targeted solutions:

1、 Abnormal mixing function

Phenomenon 1: Magnet does not rotate or the speed is unstable

Reason: External magnetic field interference (such as nearby strong magnets), uneven bottom of the container causing magnetic particle jamming, or motor aging.

Solution: ① Remove surrounding magnetic objects; ② Replace the container with a flat bottom surface; ③ If there is any abnormal noise from the motor, it needs to be returned to the factory for repair.

Phenomenon 2: Insufficient mixing force

Reason: Severe wear of the magnet, high viscosity of the solution, or overloading of the sample volume.

Solution: ① Replace with a new magnet; ② Use larger size magnets or adjust the speed; ③ Batch processing of high viscosity samples.

Phenomenon 3: Normal idling but stopping after loading

Reason: Insufficient motor torque or capacitor decay.

Solution: Contact the manufacturer to repair the motor and capacitor components.

2、 Heating function failure

Phenomenon 1: No heating

Reason: The heating wire is burnt out, the solid-state relay is damaged, or the power cord is disconnected.

Solution: ① Use a multimeter to check the continuity of the electric heating wire; ② Replace the relay with the same model; ③ Check the power cord interface.

Phenomenon 2: Slow heating or inability to reach the set temperature

Reason: Scale buildup on the heating plate affects thermal conductivity efficiency, sensor calibration deviation, or rapid heat dissipation.

Solution: ① Soak and clean the heating plate with oxalic acid; ② Re calibrate the temperature sensor; ③ Install insulation cover to reduce heat loss.

Phenomenon 3: Actual temperature far exceeds the set value

Reason: Temperature controller malfunction or heating tube out of control.

Solution: ① Immediately power off and replace the temperature control module; ② If the heating tube is short circuited, it needs to be replaced as a whole.

3、 Control system disorder

Phenomenon 1: Incomplete display on the digital display or malfunctioning buttons

Reason: The humid environment can cause the circuit to become damp, the buttons to have poor contact, or the motherboard program to malfunction.

Solution: ① Natural drying in a dry environment; ② Open the panel and clean the contact oxide layer; ③ Reset factory settings or upgrade firmware.

Phenomenon 2: Timing function failure

Reason: Aging of crystal oscillator components or memory overflow.

Solution: ① Replace the same frequency crystal oscillator; ② Close unnecessary programs to free up memory.

4、 Other mechanical issues

Phenomenon 1: Intense vibration or loud noise during operation

Reason: rotor eccentricity, lack of oil in bearings, or loose tabletop.

Solution: ① Correct rotor balance; ② Add high-temperature lubricating oil; ③ Tighten the table top fixing screws.

Phenomenon 2: The shell is hot and has a noticeable odor

Reason: Blockage of the fan leads to poor heat dissipation or short circuit of wires.

Solution: ① Clean the dust on the fan; ② Immediately stop the machine to check the circuit and replace the fuse if necessary.

5、 Daily maintenance suggestions

1. Regular maintenance: Clean the heating plate and magnet every month, and check the insulation layer of the wires every quarter;

2. Standardized operation: Avoid splashing corrosive liquids into the interior of the instrument and prohibit dry burning;

3. Environmental management: Place in a ventilated and dry place, away from high-frequency equipment to reduce interference.

The above methods can quickly locate and repair most faults. If it involves damage to core components, it is recommended to contact professional after-sales service. Reasonable maintenance can significantly extend the service life of equipment and ensure the safe and efficient conduct of experiments.