The heating switch is not turned on, but the temperature still rises. The reason for this is that the contacts of the heating AC contactor are glued together and cannot be disconnected. The solution is to replace the contactor.
The power supply trips after turning on the heating switch. There are three possible reasons for this situation: the first is that the heating tube and the electric furnace are short-circuited. The solution is to disassemble the furnace body and check the heating tube; the second is that the power supply switch capacity is too small. The solution is to replace the large-capacity switch; the third is that the main power switch box is installed with a leakage protection switch, but the wiring is incorrect. The solution is to check the circuit and correct it.
The machine cannot be turned on after power is turned on. There are two possible reasons for this situation: the first is that the power supply does not meet the requirements of the specifications. The solution is to connect the power supply required by the specifications; the second is that the neutral wire may not be connected. The solution is to connect the neutral wire.
The temperature inside the furnace is uneven and abnormally high. There are three possible causes: the first is that the thermocouple is not sensitive, and the solution is to replace the thermocouple; the second is that the temperature controller is not sensitive and the action is out of control, and the solution is to replace the temperature controller; the third is that the workpiece is not placed properly and the furnace door is not closed properly, and the solution is to change the way the workpiece is placed and close the furnace door.
