Whirlpool · Microwave Moderate
F5 — Shorted Humidity Sensor
The humidity sensor circuit has been shorted for more than 5 seconds. Older OTR fault chart; on newer models the equivalent is F4E4 or F5E0/E1.
- Keep using it?
- Yes, with caution
- DIY difficulty
- Moderate
- Verified against
- applianceaid.com ↗
How to fix it
- Power-cycle at the breaker for 1 minute.
- Unplug the microwave and disconnect the humidity sensor; the F5 should clear with the sensor disconnected.
- Check the sensor wiring along its full length for melted insulation or pinches.
- Install a new humidity sensor and retest a sensor-cook cycle.
- Replace the electronic control only if a new sensor and harness don't clear the code.
Why it happens
Typical signs: F5 on the display · Sensor cook modes fail · Microwave still cooks manually
- Internally shorted humidity sensor Heat and grease eventually short the element.
- Pinched or melted sensor wire A wire pinched at install can short to the cabinet.
- Failed control board Less common; verify the sensor and wiring first.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
- Whirlpool microwave humidity sensor Common replacementAmazon →
More Whirlpool microwave codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: applianceaid.com.