Charger shows E18 and does not start; may be labeled as "phase error" on three-phase models.

High voltage hazard: Three-phase wiring should only be serviced by qualified personnel.

• Step 1 – Verify supply: Using a multimeter, confirm that all three phases are present at the input terminals and that line-to-line voltages are within specification.
• Step 2 – Check phase rotation: If the charger requires a specific phase sequence, use a phase rotation tester to verify correct order.
• Step 3 – Tighten terminals: With power off, tighten all phase conductors on the BougeRV input terminal block and inspect for heat damage.
• Step 4 – Internal wiring: Ensure that internal jumpers or links for single/three-phase configuration (if present) are set correctly per BougeRV documentation.
• Step 5 – Board fault: If supply and wiring are correct but E18 persists, the phase detection circuit on the main control board may be defective and require replacement.