Samsung Microwave Error Codes: Quick Reference Table
Samsung microwaves display error codes on the digital panel when something goes wrong. Most codes point to a specific component, making diagnosis straightforward. Below is the full list of common codes with their meanings and recommended fixes.
| Code | Meaning | Fix |
|---|---|---|
| SE / -SE- | Keypad short circuit or stuck button | Unplug for 30 seconds, plug back in, press Start |
| E-11 | Temperature sensor fault | Contact Samsung service centre |
| E-21 | Humidity sensor malfunction | Clean interior thoroughly, then contact service if it persists |
| E-13 | Cooling fan error | Check ventilation clearance around the unit |
| C-d0 | Demo mode active (display-only, no heating) | Hold the Start button for 3 seconds to exit demo mode |
Top Error Codes Explained in Detail
SE / -SE- — Keypad Short Circuit
The SE error is the most frequently reported Samsung microwave code. It typically means one or more keys on the membrane keypad have shorted or are stuck. Moisture, steam, or a manufacturing defect can trigger it.
- Unplug the microwave from the wall socket.
- Wait a full 30 seconds to allow the control board to reset.
- Plug back in and press the Start button once.
- If the code clears, the keypad is fine — monitor for recurrence.
- If SE returns immediately, the membrane keypad or control board needs replacement.
E-11 — Temperature Sensor Fault
The E-11 code signals that the internal temperature sensor is not reading correctly. This sensor prevents overheating and controls auto-cook programs. There is no reliable DIY fix — the sensor requires professional testing with a multimeter and replacement if faulty. Book a Samsung authorised service visit.
E-21 — Humidity Sensor Issue
E-21 relates to the humidity (moisture) sensor used in auto-cook and steam functions. Food splatter or condensation on the sensor lens can trigger a false reading.
- Unplug the unit and let it cool completely.
- Wipe the interior walls, ceiling, and door inner surface with a damp cloth.
- Dry thoroughly before plugging back in.
- If the code persists, the sensor itself has failed and needs a technician.
E-13 — Cooling Fan Error
The cooling fan keeps the magnetron and electronics at a safe temperature. E-13 appears when the fan is blocked, running slowly, or has stopped. Ensure at least 15 cm of clearance on all sides of the microwave and that the external vents are not blocked by a wall or cabinet.
C-d0 — Demo Mode
C-d0 is not a fault — it means the microwave is in showroom demo mode and will not generate heat. Simply press and hold the Start button for three seconds. The display will confirm the mode has been deactivated.
When to Call a Technician
Attempt DIY fixes only for SE and C-d0. Call an authorised Samsung service technician if:
- Any E-series code returns after a power reset.
- The microwave sparks, smells of burning, or makes loud humming noises.
- The keypad replacement does not clear the SE code (control board may be at fault).
- The unit is under warranty — opening the casing voids it.
Prevention Tips
- Cover food every time — splatter on sensors and the keypad area is the leading cause of SE and E-21 errors.
- Never run the microwave empty — no load causes the magnetron to overheat and can damage the temperature sensor.
- Clean weekly — a quick wipe after each use prevents build-up on the humidity sensor lens.
- Ensure adequate ventilation — blocked vents directly cause E-13 cooling fan errors.
- Avoid slamming the door — repeated impact loosens door switches and can trigger new error codes over time.
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