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

  1. Unplug the microwave from power.
  2. Wait 5–10 minutes to allow internal electronics to reset.
  3. Plug it back in and see if the F4 code clears.

Technician Only Inspect and replace humidity sensor assembly

  1. Disconnect power and discharge internal capacitors before working inside.
  2. Access the humidity sensor according to model‑specific service manual.
  3. Check sensor wiring harness for continuity and secure connections.
  4. If open circuit or faulty, replace the humidity sensor.
  5. Reassemble and test operation.

Parts needed: Humidity sensor, Sensor harness/connectors

🛑 When to Call a Pro:
  • 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.

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: 2026-02-19

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