Kenmore 721.80373 Elite Over-the-Range Microwave F-4 Error Fix: Humidity Sensor Fault

Humidity sensor for automatic sensor cooking/reheating not reading correctly. Sensor detects steam from food to determine cook time. Clean sensor if accessible. Replace sensor or control board.

Low severity2 fixes available✨ Free fix available

Quick Answer

Error F-4 on the Kenmore 721.80373 Elite Over-the-Range Microwave means: Humidity Sensor Fault. The top-ranked community fix is “Replace the Humidity Sensor or Control Board” (medium difficulty, ~45 min, DIY cost: $15-$25). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · microwave

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many microwave repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$250.

Other Kenmore 721.80373 Elite Over-the-Range Microwave Error Codes

Door Switch Failure

Oven Sensor Open

Oven Sensor Shorted

Touch Pad / Keypad Shorted

2 fixes

F-5

Control Board Error

2 fixes

Inverter or Magnetron Error

2 fixes

TURNTABLE STUCK

Turntable Motor Failure

2 fixes

WAVEGUIDE SCORCHED

Waveguide Cover Scorched

2 fixes

People Also Ask About Kenmore 721.80373 Elite Over-the-Range Microwave Error F-4

What does error code F-4 mean on a Kenmore 721.80373 Elite Over-the-Range Microwave?

Error code F-4 on the Kenmore 721.80373 Elite Over-the-Range Microwave means: Humidity Sensor Fault. Humidity sensor for automatic sensor cooking/reheating not reading correctly. Sensor detects steam from food to determine cook time. Clean sensor if accessible. Replace sensor or control board.

How do I fix error code F-4 on my Kenmore 721.80373 Elite Over-the-Range Microwave?

The most successful fix is "Replace the Humidity Sensor or Control Board" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code F-4 on a Kenmore 721.80373 Elite Over-the-Range Microwave serious?

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Kenmore 721.80373 Elite Over-the-Range Microwave error F-4 myself?

Yes — the top-ranked community fix ("Replace the Humidity Sensor or Control Board") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Needle-nose pliers, Multimeter.

How much does it cost to repair Kenmore 721.80373 Elite Over-the-Range Microwave error F-4?

DIY cost: $15-$25. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Kenmore 721.80373 Elite Over-the-Range Microwave have?

The Kenmore 721.80373 Elite Over-the-Range Microwave has 8 other known error codes, including: DOOR SWITCH FAIL (Door Switch Failure), F-1 (Oven Sensor Open), F-2 (Oven Sensor Shorted), F-3 (Touch Pad / Keypad Shorted), F-5 (Control Board Error), and 3 more.

What other error codes does the Kenmore 721.80373 Elite Over-the-Range Microwave have?

The Kenmore 721.80373 Elite Over-the-Range Microwave has 8 other known error codes:

DOOR SWITCH FAIL — Door Switch Failure (2 fixes)
F-1 — Oven Sensor Open (2 fixes)
F-2 — Oven Sensor Shorted (2 fixes)
F-3 — Touch Pad / Keypad Shorted (2 fixes)
F-5 — Control Board Error (2 fixes)
SE — Inverter or Magnetron Error (2 fixes)
TURNTABLE STUCK — Turntable Motor Failure (2 fixes)
WAVEGUIDE SCORCHED — Waveguide Cover Scorched (2 fixes)

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