The error ''Thermal Overload'' means that the drum/stirrer/vacuum motor is asking to much amperage so the thermal overload blocks will go in safety error.
To reset the alarm, follow these steps: open the control panel door, lock the thermoblock with the red light on, and then press the blue button on the thermoblock for 3 seconds. The alarm should be cleared after completing these steps.
If the alarm persists, it indicates a potential issue with the motor. In this situation, it's advisable to contact an electrician and provide them with the electrical drawing of the machine for thorough inspection.