Charger makes a rapid clicking sound and repeatedly starts and stops charging.

Safety first: Rapid switching can stress components. Turn off power if chattering persists.

• Check supply voltage: Have a qualified person measure voltage at the charger during a start attempt. Significant sag may indicate an undersized or overloaded circuit.
• Inspect coil wiring (power OFF): Open the unit and ensure the small-gauge wires to the contactor coil are secure and not frayed.
• Contactor replacement: If the coil is noisy or shows signs of overheating, replace the main power contactor.
• Board control issue: If voltage and contactor are good, the main control board may be rapidly enabling/disabling the coil due to a sensing fault and may need replacement.