Disposal runs but there is a noticeable electrical buzzing or arcing sound from the base; LED flashes twice-long.

Safety first: Immediately turn off power at the breaker. Do not operate the unit until the fault is corrected.

• Inspect terminal box: Remove the lower cover and check that all terminal screws are tight and that no copper conductors are exposed beyond the terminals.
• Check connectors: Ensure all spade connectors are fully seated and not discoloured from heat.
• Look for burn marks: Any signs of charring or melted plastic indicate serious arcing. Replace the affected wiring and components.
• Capacitor check (if present): Some McAlpine models use a start/run capacitor. If it is bulging or leaking, it must be replaced with an identical rated part.