Solution:

1. Swap the thermistors of the heated bed and the nozzle to determine if it is a thermistor issue. If it is, replace the faulty thermistor.

2. If the issue persists, it may be a problem with the motherboard. Please contact the manufacturer for further assistance.

The maximum temperature alarm is usually caused by a short circuit in the thermistor. You can check the thermistor circuit for any issues. Try swapping the connections between the heated bed and the thermistor and observe if the abnormal temperature readings are resolved. If they are, it indicates a faulty thermistor that needs to be replaced.

The minimum temperature alarm indicates a break in the thermistor circuit or a loose connection. If the thermistor circuit is broken, you can try swapping it with the heated bed thermistor to test if it is a thermistor issue. If it is, you will need to replace the thermistor. It is also possible that the connection is loose, causing poor contact. Try unplugging and plugging the thermistor resistor wire at the motherboard connection and check if the temperature readings are normal upon startup.

If the temperature readings are still abnormal after replacing the thermistor, it could be a problem with the motherboard. In such cases, it is recommended to return the printer to the manufacturer for repair. This will ensure a proper diagnosis and repair of the motherboard.

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How to Deal with Maximum/Minimum Temperature Alarms in a 3D Printer?