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
- Unplug the microwave from the wall outlet.
- Wait for about 1–2 minutes to allow internal electronics to discharge.
- Plug the microwave back in and attempt to clear the error by starting a simple cycle.
- 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
- Disconnect power and remove microwave covers per service manual procedures.
- Inspect the humidity/steam sensor and its wiring for signs of damage or corrosion.
- Test the sensor with appropriate diagnostic tools per Breville service guidelines.
- Replace the faulty humidity/steam sensor if defective and reassemble.
- Verify that the error no longer appears on power‑up.
Parts needed: humidity/steam sensor, connector harnesses
- 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
Next step
Choose the next step for E04
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Microwave Magnetron
Generates microwave energy for heating food and requires high-voltage service procedures.
- Typical part-only price
- $80 - $220
- DIY difficulty
- Hard
- Estimated time
- 60-120 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Microwave parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
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: 2026-07-25
User Comments (0)
Share your experience or solution below.
Please login to post a comment.
Be the first to comment!