Ge Microwave Error F4

⚡ Quick Answer: The GE microwave F4 error indicates a problem with the humidity sensor, which may lead to the microwave stopping mid-cycle and failing to heat food. T... ✅ DIY Fixable

What Does Error F4 Mean?

The GE microwave F4 error indicates a problem with the humidity sensor, which may lead to the microwave stopping mid-cycle and failing to heat food. This issue is often caused by an open or failed humidity/steam sensor or wiring problems between the sensor and the main control board. If you hear unusual humming sounds or the microwave is not heating, it's essential to address this error promptly to avoid further complications.

Common Symptoms:

  • Microwave stops mid‑cycle
  • F4 displayed on control panel
  • Microwave may not heat when code is present

Possible Causes

  • Open or failed humidity sensor (medium)
  • Wiring problem between humidity sensor and main control board (medium)

How to Fix Error F4

DIY Fix Basic reset & inspection

  1. Unplug microwave from power for at least 1–5 minutes to reset diagnostics
  2. Check cavity interior near sensor area for food debris/grease and clean carefully
  3. Plug microwave back in and observe if F4 returns

Technician Only Inspect and replace humidity sensor and wiring

  1. Unplug microwave and discharge high‑voltage capacitor safely
  2. Access internal cavity side panels to locate humidity/steam sensor
  3. Inspect sensor, wiring harness and connectors for damage, corrosion, breaks
  4. Test sensor continuity with appropriate tools; replace sensor if open or non‑responsive
  5. Reconnect harnesses securely and reassemble microwave

Parts needed: Humidity/steam sensor assembly, Wiring harness/connectors

🛑 When to Call a Pro:
  • If uncertain about internal inspection steps
  • If error persists after basic reset and cleaning
  • If internal high‑voltage parts must be accessed but user lacks training

Technical Specifications

wattage 1000W
component Magnetron
resistance 0.5-1.5 ohms
part_number GE WB27X10929
voltage_rating 120V AC

Common Questions

What does F4 error mean on GE microwave?

The F4 error indicates a humidity sensor problem, causing the microwave to stop mid-cycle and not heat.

Can I fix GE microwave F4 error myself?

Yes, you can perform a basic reset by unplugging the microwave and cleaning around the sensor area.

How much does it cost to fix F4 error?

Repair costs range from $30 to $120 for parts, plus labor.

When should I call a technician for F4?

Call a technician if the error persists after a reset or if you're uncomfortable with internal inspections.

Data last verified: 2026-01-10

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