Charger shows E012 and the screen may indicate 'Insulation Fault' or 'Isolation Error'.

Safety first: This error can indicate a potential shock hazard. Do not bypass insulation monitoring.

• Inspect for moisture: Check the connector, cable entry, and charger housing for signs of water ingress. Dry thoroughly and correct any sealing issues (gaskets, cable glands).
• Check cable jacket: Look for cuts, abrasions, or crushed areas on the output cable. Replace the cable if any conductor insulation may be compromised.
• Internal visual check (qualified only): With power off, inspect internal busbars and terminals for dust, conductive debris, or corrosion. Clean with appropriate electrical contact cleaner and lint-free cloth.
• Insulation test: A qualified technician can perform an insulation resistance test between live conductors and ground to confirm cable integrity.
• Module replacement: If insulation resistance is good but E012 persists, the insulation monitoring circuit on the main control board may be faulty and require board replacement.