Lectron Noisy Contactor or Relay Chatter

Lectron charger makes a loud buzzing or chattering noise from inside the unit during charging.

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Safety Warning

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.

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Possible Causes

Undervoltage at contactor coil, Failing main power contactor, Loose control wiring to contactor coil

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker before opening the unit. Do not touch internal components with power applied.

  • 1. Listen and locate: With the cover on, identify whether the noise is continuous or intermittent and from which area of the unit it originates.
  • 2. Check supply voltage: Have an electrician measure voltage at the Lectron input while charging. Low voltage can cause contactor chatter.
  • 3. Inspect contactor wiring: With power OFF, open the unit and ensure the small control wires on the contactor coil are tight and undamaged.

Resolution: If buzzing persists at normal voltage with secure wiring, replace the Lectron main power contactor. Prolonged chatter can lead to contact welding and failure.

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Repair Difficulty

Hard 4/5

Required Part

Lectron Main Power Contactor
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