Charger displays E12 and will not start; often after installation or rewiring.

Safety first: A missing ground is a serious safety hazard. Do not bypass ground or use adapters to defeat grounding.

• 1. Verify grounded outlet:
  • Use a plug-in outlet tester (for 120 V models) to confirm correct wiring and presence of ground.
  • If the tester indicates an open ground, have a licensed electrician correct the wiring.
• 2. Check ground connections (hardwired units):
  • Turn off the breaker and open the junction box feeding the Megear charger.
  • Confirm that the ground conductor is securely connected to the charger’s ground terminal and the box/panel ground.
• 3. Internal ground bond:
  • With power off, open the charger housing.
  • Verify that the ground wire from the input terminal is firmly attached to the chassis ground point.
  • Tighten any loose screws and ensure there is no corrosion.

Do not operate the charger until a proper ground is verified. If E12 persists with a known-good ground, the ground sensing circuit on the main control board may be defective.