E16
McAlpine
Dry or Failing Motor Bearings
Disposal makes a high-pitched squealing or screeching noise during operation; LED flashes once-long, six-short.
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Safety Warning
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.
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Possible Causes
Worn upper motor bearing, Worn lower motor bearing, Misaligned rotor shaft, Contamination of bearings from water ingress
How to Fix / Troubleshooting
Safety first: Turn off power before inspecting the unit.
- Confirm noise source: Run the disposal briefly with water and listen closely under the sink to confirm the squeal is from the motor, not the plumbing.
- Check for rubbing: With power off, rotate the impeller plate using a tool. If you feel roughness or hear grinding, the bearings are likely failing.
- Do not lubricate externally: Motor bearings in McAlpine disposals are sealed and cannot be effectively lubricated from outside.
Persistent squealing indicates bearing failure. The correct remedy is replacement of the motor assembly or the entire disposal unit.
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Repair Difficulty
Hard
4/5
Required Part
Motor Assembly
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