Hamilton Beach Intermittent Power Loss or Overcurrent Shutdown

Microwave runs for a few seconds then shuts off completely; display may reset or show time again.

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.

Possible Causes

Failing door switch losing contact, Overheating magnetron or transformer tripping thermal fuse, Loose power cord connection, Failing control board

How to Fix / Troubleshooting

Safety: Unplug the microwave before inspection.

Checks:

Observe whether the display goes blank or simply returns to the clock. A full reset suggests power interruption or internal protection trip.
Inspect the power cord and plug for looseness or damage.
Open and close the door; if jiggling the door affects operation, suspect the door switches or latch.

Internal (qualified DIYers):

Check door switch alignment and replace any intermittent switches.
Inspect thermal fuses and thermostats for signs of overheating.
If the unit shuts down under load repeatedly, the magnetron or transformer may be drawing excessive current; have a technician test and replace as needed.

Repair Difficulty

Hard 4/5

Required Part

Door Switch Assembly

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