E13
BMW Phase Loss / Phase Imbalance Detection

BMW EV charger indicates E13; phase imbalance or missing phase detected, charging reduced or blocked

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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

One phase not connected or tripped upstream breaker, Loose phase conductor in BMW Wallbox terminal block, Asymmetric supply from utility, Faulty phase detection circuit on control board

How to Fix / Troubleshooting

Safety first: Only a qualified electrician should work on three-phase circuits. Turn off the main and Wallbox breakers before opening any covers.

  • Check upstream breakers: Verify that all three phase breakers feeding the Wallbox are ON and not tripped.
  • Inspect terminal block: With power off, confirm that L1, L2, and L3 conductors are correctly landed and tightened in the BMW Wallbox input terminals.
  • Measure phase voltages: Have an electrician measure voltage between each pair of phases and to neutral. Significant deviation indicates a supply issue.
  • Test single-phase mode (if supported): Some BMW Wallboxes can operate in single-phase mode; configure accordingly and test.

If E13 persists with a healthy three-phase supply, the internal phase detection circuit or current sensors may be faulty. A BMW-authorized technician should replace the main control board or sensor assembly.

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Repair Difficulty

Professional Required 5/5

Required Part

BMW Wallbox Phase Detection / Current Sensor Assembly
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