Kenmore Microwave Error F4
⚡ Quick Answer: The Kenmore microwave error code F4 indicates a malfunction related to the humidity sensor, often resulting in the microwave displaying 'F4' and faili... ✅ DIY Fixable
What Does Error F4 Mean?
The Kenmore microwave error code F4 indicates a malfunction related to the humidity sensor, often resulting in the microwave displaying 'F4' and failing to start cooking cycles. This issue may manifest as unusual buzzing sounds and persists even after resetting the power. A faulty or open humidity sensor circuit is typically the root cause that requires attention.
Common Symptoms:
- Microwave displays "F4" on control panel and will not start cooking cycles.
- Error persists after cycling power off/on.
Possible Causes
- Humidity sensor open or failed (medium)
How to Fix Error F4
DIY Fix Basic reset and check
- Unplug the microwave from power.
- Wait 5–10 minutes to allow internal electronics to reset.
- Plug it back in and see if the F4 code clears.
Technician Only Inspect and replace humidity sensor assembly
- Disconnect power and discharge internal capacitors before working inside.
- Access the humidity sensor according to model‑specific service manual.
- Check sensor wiring harness for continuity and secure connections.
- If open circuit or faulty, replace the humidity sensor.
- Reassemble and test operation.
Parts needed: Humidity sensor, Sensor harness/connectors
- If basic reset does not clear the error.
- If you are not comfortable accessing internal components.
- If continuity checks suggest wiring or control board faults.
Next step
Choose the next step for F4
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
Capacitor
Stores electrical energy to assist in starting or running the motor efficiently.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 10-20 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.
Microwave Magnetron
Generates microwave energy for heating food and requires high-voltage service procedures.
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.
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Technical Specifications
| wattage | 1000W |
|---|---|
| component | Magnetron |
| resistance | 0.5-1.5 ohms |
| part_number | WB27X10928 |
| voltage_rating | 120V AC |
Common Questions
What does F4 error mean on kenmore microwave?
The F4 error indicates a humidity sensor malfunction, preventing the microwave from starting.
Can I fix kenmore microwave F4 error myself?
Yes, try resetting the microwave by unplugging it for 5-10 minutes.
How much does it cost to fix F4 error?
Repair costs range from $30 to $120 for parts, plus labor, depending on the model.
When should I call a technician for F4?
Call a technician if the reset doesn't work or if you're uncomfortable accessing internal parts.
Data last verified: 2026-07-25
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