Charger shows E02 and refuses to start charging, vehicle does not lock the connector, relay clicking may be heard briefly.

Safety first: Turn off the dedicated EV charger breaker and verify absence of voltage with a suitable meter before touching internal components.

• 1. Listen and observe:
  • When powering up (with cover on), you may hear a relay click. If E02 appears immediately, the charger may detect that the contactor is stuck closed or not closing properly.
• 2. Visual inspection of contactor:
  • Remove power and open the charger housing according to Heidelberg service instructions.
  • Locate the main power contactor (often a 2‑pole or 3‑pole relay module).
  • Check for discoloration, melted plastic, or signs of overheating.
• 3. Mechanical test:
  • With power off, gently tap the side of the contactor with an insulated tool to free a possibly stuck armature.
  • Re‑energize the charger and see if E02 clears. If it clears temporarily, the contactor is failing and must be replaced.
• 4. Electrical test (for qualified persons only):
  • Measure coil resistance and compare with the contactor datasheet.
  • Check that the control board is supplying the correct coil voltage when a charge session is requested.
• 5. Replace if necessary:
  • If the contactor is welded or the coil is open, replace the main power contactor with the Heidelberg‑specified part.
  • Ensure all power lugs are tightened to the torque specified in the installation manual.