Charger reports relay self-test failure or isolation fault; unit refuses to energize output.

Warning: Isolation faults can expose dangerous voltages. Only qualified technicians should open the unit.

• Step 1 – De-energize and inspect:
  • Turn OFF the breaker.
  • Open the charger housing.
  • Look for signs of water ingress, condensation, or corrosion on the main control board and power components.
• Step 2 – Dry and clean:
  • If moisture is present, carefully dry the interior with a clean cloth and allow several hours of drying time.
  • Clean light contamination on PCB surfaces with isopropyl alcohol and a soft brush.
• Step 3 – Check enclosure seals:
  • Inspect gaskets, cable glands, and conduit entries for damage.
  • Replace or reseal to prevent future ingress.
• Step 4 – Retest:
  • Reassemble, restore power, and see if the error clears.
• Step 5 – Persistent isolation fault:
  • If the error remains, the isolation monitoring circuit or insulation of internal components may be compromised.
  • Replace the main control board or affected high-voltage module as recommended by ChargePoint.