KEBA Intermittent Supply or Contactor Drop-Out

Charging stops randomly during session; KEBA LEDs show ready state again without an error code

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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

Loose supply terminal at input block, Weak contactor coil connection, Over-sensitive upstream breaker or RCD tripping momentarily, Vibration causing intermittent contact

How to Fix / Troubleshooting

Safety first: Random drop-outs may indicate overheating or loose connections. Isolate power before opening the charger.

Steps:

  • 1. Check upstream protection: Inspect the main breaker and RCD feeding the KEBA charger. Look for signs of tripping or overheating. Ensure ratings match the charger's maximum current.
  • 2. Tighten supply terminals: With power off, tighten all terminals on the KEBA input block and main contactor.
  • 3. Inspect for heat damage: Look for discoloration around terminals and on the PCB near the contactor coil driver.
  • 4. Monitor during test charge: After re-energizing, start a test charge and gently tap the housing to see if vibration triggers a drop-out, indicating a loose connection.
  • 5. Replace suspect parts: Replace a main contactor with intermittent coil or contacts, or repair/replace the input terminal block if damaged.

If the upstream breaker trips, have an electrician verify cable sizing and protective device selection.

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Repair Difficulty

Hard 4/5

Required Part

Main Contactor
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