AEG Microwave Error F104

⚡ Quick Answer: The AEG microwave error F104 indicates a malfunction in the temperature sensor, which may lead to out-of-range readings. This issue often prevents the... ⚠️ Difficulty Varies

What Does Error F104 Mean?

The AEG microwave error F104 indicates a malfunction in the temperature sensor, which may lead to out-of-range readings. This issue often prevents the microwave from starting or causes it to shut down to ensure safe operation. Users may also hear unusual buzzing sounds, and food will not heat properly due to this sensor failure.

Common Symptoms:

  • Error code F104 displayed on microwave
  • Microwave may not start or may shut down to prevent unsafe operation

Possible Causes

  • Temperature sensor malfunction or out‑of‑range readings (high)

How to Fix Error F104

DIY Fix Basic checks and reset

  1. Turn off and unplug the microwave for at least 5–10 minutes.
  2. Ensure the kitchen environment is not extremely cold, which can affect sensor readings. (Community advice notes cold environments can trigger F104.)
  3. Plug the microwave back in and try a normal operation cycle.

Technician Only Sensor diagnosis and replacement

  1. Disconnect power and remove the microwave outer casing according to service manual.
  2. Visually inspect the temperature sensor and its wiring for damage or loose connections.
  3. Measure the sensor resistance with appropriate tools and compare with manufacturer specifications.
  4. Replace the sensor if readings are outside tolerance or visibly damaged.
  5. Verify associated wiring harness and connectors are intact before reassembly.

Parts needed: Temperature sensor, Sensor wiring harness

🛑 When to Call a Pro:
  • If the error code persists after a basic power reset
  • If you are not experienced with internal appliance repair
  • If there are signs of electrical or wiring damage

Next step

Choose the next step for F104

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Temperature Sensor

Monitors the internal temperature to ensure correct operation and prevent overheating.

Typical part-only price
$15 - $35
DIY difficulty
Easy
Estimated time
15-30 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.

Find a part that fits my model

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.

Possible related component

Wiring Harness

Connects controls, sensors, motors, and other electrical components inside the appliance.

$20 - $120 · Medium · 30-90 mins

Check fit & price
Model number required

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.

Find a part that fits my model

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Technical Specifications

note The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering.
part_number None

Common Questions

What does F104 error mean on AEG microwave?

F104 error indicates a malfunction in the temperature sensor, preventing the microwave from operating safely.

Can I fix AEG microwave F104 error myself?

Yes, you can try resetting the microwave and checking the environment, but further issues may require professional help.

How much does it cost to fix F104 error?

Repair costs range from $50 to $150 for parts, plus labor, depending on service rates.

When should I call a technician for F104?

Call a technician if the error persists after resetting or if you notice electrical damage.

Sources & References

Data last verified: 2026-07-31

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