United Chargers Noisy Contactor / Coil Vibration

Charger makes a loud buzzing or chattering noise when charging.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Worn or loose contactor, Low control voltage to contactor coil, Mechanical resonance in mounting, Contaminated contactor core

Safety first: Noise often indicates arcing risk. Turn off power before inspection.

Confirm source: Remove the cover (power OFF) and identify the component producing the noise during operation.
Check mounting: Ensure the contactor is firmly mounted and all screws are tight.
Measure coil voltage: A technician should verify the coil receives the correct control voltage when energized.

If buzzing persists and the contactor shows signs of wear or heat, replace it with the specified United Chargers contactor.

Hard 4/5

Main Power Contactor

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