Charger displays E19 and stops charging; may be labeled as "isolation fault".

Danger: Isolation faults can expose users to hazardous voltages. Do not continue using the charger until inspected.

• Step 1 – Inspect for moisture: Disconnect power and open the charger. Look for water, condensation, or corrosion on the power module, PCB, and wiring.
• Step 2 – Dry thoroughly: If moisture is present, dry all components with a lint-free cloth and allow the unit to air dry in a warm, dry environment for at least 24 hours.
• Step 3 – Check for contamination: Look for conductive dust, insects, or other debris bridging high-voltage points. Clean carefully with isopropyl alcohol and a soft brush.
• Step 4 – Insulation test (advanced): A qualified technician can perform an insulation resistance test between live parts and ground to locate breakdown.
• Step 5 – Replace damaged parts: Replace any visibly damaged BougeRV power module or main control board. If no visible damage but E19 persists, professional diagnosis is required.