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1. The heating switch is not turned on, but the temperature is still rising. The reason for this situation is that the contacts of the heating AC contactor stick together and cannot be disconnected. The elimination method is to replace the contactor.

 

2. After turning on the heating switch, the power supply trips. There are three reasons for this situation: the first is a short circuit between the heating tube and the electric furnace, and the troubleshooting method is to open the furnace and check the heating tube; The second type is that the power switch capacity is too small, and the elimination method is to replace the high-capacity switch; The third method is to install a leakage protection switch in the main power switch box, but the wiring is incorrect. The troubleshooting method is to check the circuit and correct it.

 

3. Unable to start after power on. There are two reasons for this situation: firstly, the power supply does not meet the specifications, and the troubleshooting method is to connect the power supply with the specifications; The second reason is that the zero line may not be connected, and the elimination method is to connect the zero line.

 

4. The temperature inside the furnace is uneven and abnormally high. There are three possible reasons: firstly, the thermocouple is not sensitive to reaction, and the elimination method is to replace the thermocouple; The second is that the temperature controller is not sensitive and its action is out of control. The solution is to replace the temperature controller; The third reason is that the workpiece placement is unreasonable, and the furnace door is not closed. The elimination method is to change the workpiece placement and close the furnace door.