Machine will not start; only a clicking sound is heard from inside when the switch is turned on.

Safety: Disconnect power before accessing internal components.

• Verify supply: Confirm correct voltage at the outlet and at the machine's terminal block.
• Inspect motor connectors: Check that all motor connectors are fully seated and free of corrosion or burn marks. Reseat or replace as needed.
• Test motors: Measure resistance across motor terminals. An open circuit indicates a failed motor. Replace the affected Prochem motor.
• Check relays/contactors: Inspect relay contacts for pitting or burning. If the relay clicks but does not pass power, replace the relay or the entire control PCB if relays are board-mounted.