How to Fix / Troubleshooting

Safety First: Disconnect power at the breaker before removing the door panel.

Access vent assembly: Remove the inner door panel screws and carefully separate the panel to expose the vent assembly near the top of the door.
Inspect vent door and fan: Check that the vent door moves freely and is not obstructed by debris or warped plastic. Spin the fan blades gently to ensure they are not jammed.
Check wiring: Verify the vent fan connector is fully seated and wires are intact. Repair any damaged wiring.
Test fan motor: With a multimeter, test the fan motor for continuity. If open, replace the vent fan assembly with a Frigidaire Professional-compatible part.
Control board check: If the fan tests good but never receives voltage during the drying phase, the main control board may have a failed output.
When to call a technician: If replacing the vent assembly does not clear the UO code, professional diagnosis of the control board is recommended.

Dishwasher displays UO and may pause or not start; fan may not run during drying.

Possible Causes