Hamilton Beach Intermittent High-Voltage or Turntable Control

Microwave interior light and fan work, but turntable and heating stop intermittently during a cycle.

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

Loose wiring to turntable motor or magnetron, Failing door switch losing contact mid-cycle, Overheating thermostat cycling off, Failing control board relay

How to Fix / Troubleshooting

Safety: Unplug the microwave before inspection.

Steps:

Observe whether the issue is triggered by door movement (e.g., tapping the door). If so, suspect door switches.
Check for overheating: if the unit stops after long runs and resumes after cooling, a thermostat may be cycling off due to poor ventilation.

Internal (qualified DIYers):

Inspect and reseat wiring connectors to the turntable motor, magnetron, and thermostats.
Test door switches for intermittent operation and replace if necessary.
If relays on the control board chatter or fail intermittently, replace the control board.

Repair Difficulty

Hard 4/5

Required Part

Door Switch Assembly

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