If the issue persists, then there is something wrong with your printer's thermistor or heater. In order to find out which one of these two is malfunctioning, perform the simple test described below.
Bed preheat error
Make sure that the ambient temperature is stable and there is cooling down the printer, such as a nearby air-conditioning unit or an open window.
Make sure the heatbed thermistor is properly seated under the heated bed and secured with the golden Kapton tape. If not, then simply put it back and make sure that the thermistor cable has some space for movement.
If the issue persists, there is something wrong with your printer's thermistor or heater. In order to find out which one of these two is malfunctioning, perform the simple test described below.
Testing the thermistor and heater
You can also verify if the thermistor or heater are damaged using a multimeter
It is not very common, but there is a chance that only the thermistor is defective. You can check it using the following test:
Use a hairdryer to blow hot air at the heatbed or hotend.
In the meantime, check if there is any temperature change on the LCD screen.
If there is a positive temperature change it means that the heatbed or hotend thermistor is working. Which means there is something wrong with the heater or heatbed. In both cases contact our support and they will provide assistance.
If there is no change at all, the hotend or heatbed thermistor is defective.
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