Charger reports contactor fault; app or diagnostics show contactor weld or contactor open error; charging disabled.

Danger: A welded contactor can leave the output energized unexpectedly. Only qualified personnel should service this fault.

• Step 1 – De-energize:
  • Turn OFF the EVSE breaker and verify power is off.
• Step 2 – Inspect contactor:
  • Open the charger housing.
  • Locate the power contactor.
  • Check for burn marks, melted plastic, or signs of overheating.
• Step 3 – Mechanical test (qualified):
  • With power OFF, manually operate the contactor (if design allows) to see if it moves freely.
  • If stuck or welded, replace the contactor.
• Step 4 – Coil and control test:
  • Check coil resistance with a multimeter; compare to spec.
  • Inspect control wires from the main control board to the contactor for loose or damaged connections.
• Step 5 – Replace faulty parts:
  • Install a new power contactor of the same rating.
  • If the contactor tests good but the fault persists, the main control board driver circuit may be defective and should be replaced.