Skip to main contentStart diagnosing F3H on your Whirlpool hood
What this code means
Humidity sensor failure. There is an approximate 30-second delay before F3H is displayed.
First step from the service manual
Unplug microwave oven or disconnect power, then connect a new humidity sensor to the PCBA (at P1).
Next steps: diagnose the root cause
1
Verify the error code is active
Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.
2
Get the full diagnostic procedure
Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.
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Access Whirlpool hood service manuals, wiring schematics, exploded parts views, and error code references on MyPros+.