Charger shows E05 and does not energize the relay; vehicle does not begin charging.

Safety first: Low voltage can overheat wiring and damage equipment. Turn off power before opening any covers.

• 1. Check supply voltage under load: Have an electrician measure voltage at the charger while another high-load device is running on the same circuit. If voltage drops significantly below 208V (for a 240V unit), the circuit may be overloaded or undersized.
• 2. Inspect breaker and wiring size: Confirm the breaker and wire gauge match the Primecom charger's current rating (e.g., 40A charger on 50A circuit with appropriate wire).
• 3. Tighten input terminals: With power off, tighten all line and neutral screws in the input terminal block to manufacturer torque specs.
• 4. Avoid shared circuits: Ensure the charger is on a dedicated circuit as required by code. Remove other loads from the same breaker.
• 5. If voltage is stable and within spec: Persistent E05 with correct voltage suggests a defective voltage sensing circuit on the main control board; replacement is recommended.