Frigidaire Dishwasher Error Code UO — Vent Not Closing Properly
What this means
Error code UO (or ER/uo) indicates the dishwasher's drying vent is not closing when it should during the wash cycle. This can cause steam leaks, poor wash performance, and water dripping from the vent area. The vent actuator or vent assembly may be stuck or failed.
Alternate codes: ER/uo
Step-by-step fix
4 stepsLocate and inspect the vent
The vent assembly is located on the inner door panel, typically near the top. Open the door and look for the vent opening. Check for food debris or detergent buildup blocking the vent.
Run your finger around the vent opening — a sticky residue from detergent can prevent proper sealing.
Clean the vent assembly
Use a damp cloth to clean around the vent opening and flapper. Remove any buildup that could prevent the vent from closing.
Soak the area with warm water and vinegar to dissolve mineral deposits.
Test the vent actuator
Remove the inner door panel to access the vent motor/actuator. Run a cycle and listen for the actuator clicking when it should open and close.
The vent should close at the beginning of the wash phase and open during drying.
Replace the vent assembly
If the actuator or vent mechanism has failed, replace the entire vent assembly.
The vent assembly typically includes the actuator motor, flapper, and seal as one unit.
When to call a professional
If the vent assembly replacement doesn't resolve the error, the control board's vent circuit may need diagnosis.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Vent Assembly with Actuator
Part #154458901 · $30–$60
If vent mechanism or actuator has failed
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