Breville Microwave Error E04

⚡ Quick Answer: The Breville microwave error E04 indicates a malfunction in the humidity or steam sensor, preventing the appliance from starting cooking cycles. Users... ✅ DIY Fixable

What Does Error E04 Mean?

The Breville microwave error E04 indicates a malfunction in the humidity or steam sensor, preventing the appliance from starting cooking cycles. Users may notice the microwave beeping and displaying the E04 code, often accompanied by unusual buzzing sounds. This error suggests an issue with the sensor that detects humidity levels, which can disrupt normal operation. A simple reset may resolve the issue, but persistent problems often require sensor inspection or replacement.

Common Symptoms:

  • Microwave beeps and shows E04 on the display
  • Cooking will not start when the error is displayed

Possible Causes

  • Humidity / steam sensor error (medium)

How to Fix Error E04

DIY Fix Basic reset and inspection

  1. Unplug the microwave from the wall outlet.
  2. Wait for about 1–2 minutes to allow internal electronics to discharge.
  3. Plug the microwave back in and attempt to clear the error by starting a simple cycle.
  4. Ensure the interior of the microwave is dry and there is no condensation or spills on sensors.

Technician Only Inspect and replace humidity/steam sensor

  1. Disconnect power and remove microwave covers per service manual procedures.
  2. Inspect the humidity/steam sensor and its wiring for signs of damage or corrosion.
  3. Test the sensor with appropriate diagnostic tools per Breville service guidelines.
  4. Replace the faulty humidity/steam sensor if defective and reassemble.
  5. Verify that the error no longer appears on power‑up.

Parts needed: humidity/steam sensor, connector harnesses

🛑 When to Call a Pro:
  • If the error persists after reset attempts
  • If the humidity/steam sensor or related wiring shows visible damage
  • If internal inspection requires accessing high‑voltage sections

Technical Specifications

wattage 900W
component Magnetron
resistance 0.5-1.0 ohms
part_number Breville BMO700SIL-MAG
voltage_rating 120V AC

Common Questions

What does E04 error mean on Breville microwave?

E04 indicates a humidity/steam sensor malfunction, preventing cooking.

Can I fix Breville microwave E04 error myself?

Yes, try unplugging the microwave for 1-2 minutes to reset it.

How much does it cost to fix E04 error?

Estimated repair costs range from ¥5,000 to ¥15,000, depending on the issue.

When should I call a technician for E04?

Call if the error persists after a reset or if parts show visible damage.

Data last verified: 2026-04-14

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