Microwave beeps and shows E5; some auto-cook or sensor functions do not work.

Safety Warning: Unplug the microwave before any disassembly. Avoid contact with high-voltage components.

Basic steps:

• 1. Reset the unit: Disconnect power for 5–10 minutes, then reconnect and test. Sometimes E5 is triggered by a temporary overheat condition.
• 2. Allow cooling: If the microwave was used repeatedly, let it cool for 30 minutes with the door open, then try again.

Thermistor inspection (for experienced DIYers):

• 3. Access interior top: Unplug the unit. Remove the outer cover or top grille and control panel as needed to access the cavity top where the thermistor is usually mounted.
• 4. Check wiring: Inspect the thermistor harness for pinched, burned, or broken wires. Ensure the connector at the control board is fully seated.
• 5. Test thermistor: Disconnect the thermistor and measure its resistance at room temperature. Compare to RCA service specifications (typically tens of kΩ). An open or zero reading indicates a bad sensor.

Replace the thermistor with the correct RCA part if defective. If the thermistor tests good but E5 remains, the control board may be faulty and should be evaluated by a technician.