Delonghi Microwave Error E03
⚡ Quick Answer: The DeLonghi microwave error E03 indicates a malfunction, likely related to the magnetron, causing the microwave to stop functioning and often accompa... ✅ DIY Fixable
What Does Error E03 Mean?
The DeLonghi microwave error E03 indicates a malfunction, likely related to the magnetron, causing the microwave to stop functioning and often accompanied by unusual humming sounds. Users may experience a persistent error even after power cycling the appliance. If troubleshooting through simple resets does not resolve the issue, further investigation is required to identify potential faults in the control board or internal components.
Common Symptoms:
- Microwave displays E03 and stops operation
- Error is persistent after power cycling (user reports for other brands)
Possible Causes
- Magnetron
How to Fix Error E03
DIY Fix Basic Power Reset
- Unplug the microwave from the wall outlet.
- Wait 1–2 minutes to allow capacitors to discharge.
- Plug the microwave back in and power on.
Technician Only Professional Diagnostic & Repair
- Use service diagnostic tools to read error logs if available.
- Inspect internal sensors, control board, and power circuits.
- Replace failed components or correct wiring as indicated by tests.
Parts needed: control board, internal sensors, wiring harness
- If the E03 error persists after basic power reset.
- If there are signs of electrical failure such as burning smell, smoke, or arcing.
- If the unit does not respond or function normally.
Next step
Choose the next step for E03
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
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
- Typical part-only price
- $120 - $280
- DIY difficulty
- Medium
- Estimated time
- 20-40 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.
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Technical Specifications
| wattage | 1000W |
|---|---|
| component | Magnetron |
| resistance | 0.5-1.5 ohms |
| part_number | DELMAG-MAG1234 |
| voltage_rating | 120V AC |
Common Questions
What does E03 error mean on delonghi microwave?
E03 error indicates a magnetron malfunction, causing the microwave to stop working and often results in unusual humming sounds.
Can I fix delonghi microwave E03 error myself?
Yes, you can attempt a basic power reset by unplugging the microwave for 1-2 minutes and then plugging it back in.
How much does it cost to fix E03 error?
Repair costs vary widely; control board replacements range from $100 to $300, while sensor replacements can cost between $20 and $80.
When should I call a technician for E03?
Call a technician if the E03 error persists after a power reset, or if you notice signs of electrical failure like smoke or burning smells.
Sources & References
- De'Longhi Manuals Page (official)
- De'Longhi Manuals Page (Japan) (official)
- General Microwave E3 Code Discussion (Non‑Delonghi) (community)
Data last verified: 2026-04-23
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