E20
Land Rover
Auxiliary Power Supply Fault
Land Rover charger displays E20 and the app indicates an internal power supply error.
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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
Failed low-voltage power supply module on control board, Short circuit on low-voltage harness (e.g., to RFID, Wi‑Fi, HMI), Overvoltage event damaging DC-DC converter, Loose connector between PSU and control board
How to Fix / Troubleshooting
Safety warning: Internal power supplies are connected to mains. Only qualified persons should service them. Always isolate power first.
- 1. Power-cycle: Turn off the charger at the breaker for 5–10 minutes, then restore power and observe if the charger boots normally.
- 2. Listen and observe: If there are no LEDs, no relay clicks, and the app cannot find the charger, the auxiliary PSU may have failed.
- 3. Inspect for damage (advanced): With power OFF, open the charger and look for burnt components, bulging capacitors, or scorch marks on the control board near the PSU section.
- 4. Check low-voltage harnesses: Disconnect non-essential modules (RFID, Wi‑Fi, HMI) one at a time and retry power-up to see if a shorted module is pulling down the PSU.
- 5. If E20 or no-boot persists: The control board or PSU module will need replacement. This should be done by an authorized service technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Auxiliary Power Supply Section of Control Board
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