Whirlpool Whirlpool WMH31017HZ 1.7 cu. ft. Over-the-Range Microwave F3E0 Error Fix: Humidity Sensor Fault

Error code F3E0 on the Whirlpool Whirlpool WMH31017HZ 1.7 cu. ft. Over-the-Range Microwave means: Humidity Sensor Fault. The humidity sensor — used for auto-cook and auto-reheat functions — has failed. The sensor detects moisture level in the exhaust air to determine when food is done. Without it, auto cycles will not work correctly. Manual operation (timed cook, power levels) will still function. The humidity sensor is located in the exhaust path. Replace the sensor assembly if auto-cook functions are needed.

The most successful fix is "Replace the Humidity Sensor Assembly" (hard difficulty, ~90 minutes). Estimated DIY cost: $20-$30. HomeMD has 2 community-ranked fixes for this error.

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

Yes — the top-ranked community fix ("Replace the Humidity Sensor Assembly") is rated hard difficulty and takes about 90 minutes. Tools needed: Phillips screwdriver, Needle-nose pliers.

DIY cost: $20-$30. Professional repair typically costs $250-$350. Many homeowners save money by trying the top-ranked community fix first.

The Whirlpool Whirlpool WMH31017HZ 1.7 cu. ft. Over-the-Range Microwave has 8 other known error codes, including: F1E1 (Control Board Memory Error), F1E2 (Touchpad Error), F2E0 (Keypad Shorted), F3E1 (Oven Temperature Sensor Open), F5E1 (Door Switch Error), and 3 more.

Error code F3E0 also appears on 4 other Whirlpool models: Whirlpool WFE775H0HZ 6.4 cu. ft. Smart Slide-In Electric Range, Whirlpool WFG505M0BS 5.0 cu. ft. Freestanding Gas Range, Whirlpool WMH53521HZ 2.1 cu. ft. Over-the-Range Microwave, Whirlpool WOS51EC0HS 5.0 cu. ft. Single Wall Oven. The fix may vary by model, so check each model's specific page for tailored repair steps.