Whirlpool Hood Error Code F3H

F3H on a Whirlpool hood indicates a humidity sensor failure. The humidity sensor monitors steam levels from your cooktop to help the hood automatically adjust fan speed. The code appears after approximately a 30-second delay once the control board detects that it cannot receive a valid signal from the sensor. The fault points to either the sensor itself, the wiring connecting it, or the control board.

A failed humidity sensor means the hood can no longer automatically adjust its fan speed based on steam levels, so automatic ventilation performance will be reduced or absent. The unit may still operate manually, but you should not rely on it for proper ventilation until the sensor issue is resolved. Continued use without addressing the fault could result in inadequate kitchen ventilation during cooking.

Repair costs depend on which component has failed. A replacement humidity sensor typically costs in the range of $20 to $60 for the part alone. If the PCBA is the root cause, the control board itself can range from $80 to $200 or more depending on the model. Adding professional labor will increase the total cost of the repair.

A knowledgeable DIYer can attempt this repair by first disconnecting power, then connecting a new humidity sensor to the PCBA at the P1 connector to see if the error clears. If it does, replacing the humidity sensor resolves the issue. If the error persists with a new sensor in place, the control board likely needs professional evaluation or replacement.

Unplugging the hood or cutting power may temporarily clear the display, but F3H will return once power is restored if the underlying sensor or wiring fault has not been corrected. The 30-second delay built into the fault detection means the code may not reappear immediately after a reset. A permanent fix requires replacing the faulty component.