A： Reset the temperature and confirm the activation of the heating function. After power off, check the continuity of the heating element (test with a multimeter) and replace the damaged element.

A： Check if the temperature control and cooling connection wires are properly connected. Install liquid nitrogen. Use an air pump to blow the liquid nitrogen capillary tube, or use a temperature control software to set a negative temperature, and then use a liquid nitrogen silicone tube outlet to blow the capillary tube. Check if the ventilation of liquid nitrogen related pipelines is smooth.

A： Re calibrate the PID parameters of the thermostat. Maintain stable ambient temperature. Check the shielding and connection of the sensor circuit to eliminate interference sources.

A： Replace damaged heating elements or reposition them. Clean the countertop (polish the oxide layer with fine sandpaper) to ensure flatness.

A： Sensor troubleshooting: Use a multimeter and set it to the resistance measurement mode. Short circuit the two probes of the four core temperature control interface in sequence, and check if there is a resistance value of about 100 Ω (the sensor resistance value is about 100 Ω). If it is detected, it is normal. Temperature control wire inspection: Connect the temperature control wire to the hot and cold table, and conduct the same inspection on the resistance value of the temperature control wire.