Hi sir
Please look for wires loose in the Button, open and see if there are loose wires, and tight, or dirty with oil, and clean
with special Clean contact for electronics( see if the contacts are dirty or worn too) and replace or repair. See if there
are voltage (see the schematic diagrams if are 220Vac for coil contactor or Solenoid)
b) See the Solenoid for to connect the Feeder is loose wires, or loose Boltes, or the Iman is dirty, clean with special contact cleaner
for electronic, and of course test if there are Voltage (see the schematic diagrams) with DMM.
c) Test the fuse or c.breaker in the control box with DMM.