Charger LEDs indicate error; unit reports ‘relay test fail’ or similar during startup (if diagnostic LEDs available)

Safety: High‑voltage switching inside; de‑energize before opening.

• Listen for click: During startup, absence of the usual contactor click suggests a stuck or non‑energized contactor.
• Inspect control wires: With power OFF, verify that the small‑gauge control wires from the main control board to the contactor coil are secure.
• Check for mechanical obstruction: Ensure no foreign objects or misrouted wires are interfering with the contactor armature.
• Resolution: Replace the contactor if the coil is open or the mechanism is jammed. If the contactor is good but not being driven, the main control board driver circuit may be faulty.