Check the power supply. If the power supply is not connected, turn on the power switch to switch on the power supply.

Control loop fuse blown: need to replace the fuse immediately, find out the cause and solve.

Thermal overload relay disconnect: correct the cause of overload and reset the thermal overload electrical appliance.

If the voltage is too low, you need to ask the power department to check the input voltage, and compare with the motor end voltage to check the reason for the low voltage.

If the power supply is faulty, check the power supply.

Is it because the wiring is loose? At this time you should check all terminal terminals and tighten them if there are any loose places.

Temperature sensor fault: You need to check the sensor, if the fault, you need to contact professional maintenance personnel to repair.

Transformer fault: Check the transformer secondary voltage. 9. The thermal overload relay is disconnected: correct the overload cause and reset the thermal overload electrical appliance.