Disposal runs for a few seconds then stops, reset button pops out, LED flashes three times (if fitted).

Safety first: Isolate power at the breaker and ensure the wall switch is off.

• Clear the chamber: Remove any fibrous or stringy material (celery, onion skins, corn husks) using pliers. Avoid putting these items into the McAlpine disposal in future.
• Manually rotate the motor: Use the hex socket at the base (if provided) to rotate the motor shaft several full turns to ensure it moves freely.
• Reset the overload: Press the reset button on the underside of the unit until it clicks. Wait 5–10 minutes to allow the thermal protector to cool fully.
• Test with light load: Restore power, run cold water, and test with a very small quantity of soft food. If the unit trips again quickly, internal motor damage is likely.

Repeated overload trips indicate a failing motor or bearings. In that case, replacement of the motor assembly or complete McAlpine disposer is recommended.