(1) Display normal, settings normal, unable to heat up.

Solution to the problem: Connect the power supply, turn on the power switch, adjust the set temperature to be higher than the actual measured temperature, check if the temperature controller has an output indication. If there is, measure if there is voltage input to the heating tube. If there is, the heating tube is broken and can be replaced. If there is no voltage input to the heating tube, it is mostly due to relay failure. If the temperature controller does not have voltage output indication, it is recommended to replace the temperature controller.

(2) The temperature controller displays LLL or 999 (parameters may vary depending on the manufacturer)

The fault is a temperature sensor open circuit or short circuit, replace the sensor.

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