E18
Volvo Generic Internal Hardware Self‑Test Failure

Charger displays E18 or 'Internal Fault'; generic hardware error with no further detail; charging disabled.

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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

Defective main control board, Power supply module failure inside Volvo wallbox, Internal low‑voltage short, Sensor input out of range

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker and wait 1–2 minutes before re‑energizing.

  • Power‑cycle: Restore power and observe the startup sequence. If E18 appears immediately, the fault is likely persistent hardware.
  • Visual inspection: With power OFF and cover removed, inspect the control board and power supply section for burnt components, bulging capacitors, or loose connectors.
  • Reseat connectors: Gently reseat all plug‑in harnesses to the control board, including sensors, contactor coil, and communication modules.

If E18 remains after basic checks, detailed board‑level diagnostics are beyond typical home repair. Contact Volvo Home Charging support or a qualified EVSE technician for board or module replacement.

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Repair Difficulty

Professional Required 5/5

Required Part

Volvo EV Home Charger Power Supply Module
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