3. Weld damage/wear on contact point of electromagnetic switch in control panel.
Electromagnetic switch will not function if abnormality is found.
Start work after stopping the operation and check that breaker is off. Unplug the unit. Those who do not have sufficient mechanical/electrical knowledge should not attempt any maintenance work requiring disassembly or repairing due to risk of injuries and danger of work..
Check to find any weld damages and wear on contact points, as well as any abnormalities.