McAlpine Electrical Insulation Fault

Disposal trips the RCD/GFCI as soon as it is switched on, but there are no visible leaks.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Moisture inside McAlpine motor windings from past leak, Damaged power cord, Internal short between windings and frame, Contaminated terminal block

Safety first: Do not repeatedly reset the RCD/GFCI. Turn off power and unplug the unit if possible.

Inspect cord and plug: Replace the power cord if there is any sign of damage or moisture.
Check terminal box: Open the lower cover and ensure all connections are dry and clean. Wipe away any condensation.
Allow drying time: If the unit was recently exposed to moisture, allow 24–48 hours of drying before retesting.

Persistent RCD/GFCI tripping after drying indicates internal insulation failure; replace the McAlpine disposal.

Hard 4/5

Complete McAlpine Disposal Unit

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