FixByModel
UO

Frigidaire UO: Drying vent assembly fault

The control detected a problem with the drying vent (the flap that opens to release steam), often a wiring fault or a stuck vent. It generally needs service to the vent assembly or its harness.

May need a technician

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Loose or damaged vent assembly wiring
  2. Stuck or jammed vent flap/plunger
  3. Failed vent assembly
  4. Faulty main control board
Before you start — unplug the appliance and turn off the water supply. You'll be working near water and electrical parts, and drained water can be hot. If a step involves the pump, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Reset firstPress Cancel or cut power at the breaker for a few minutes, then restore it to rule out a glitch.
2Inspect the ventWith power off, check the vent flap on the inner door for obstruction and confirm it moves freely.
3Check wiringConfirm the vent assembly connector is seated and the wiring is undamaged.
4Run a test cycleStart a cycle and see whether the vent operates and the code clears.
5Call a technicianIf UO persists, have the vent assembly or control board tested and replaced.

Still showing UO?

If you’ve worked through every step and UO keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Frigidaire dishwashers. Frigidaire and Frigidaire Gallery dishwashers with a powered drying vent; shown on the digital display.

FAQ

What does Frigidaire UO mean?

Drying vent assembly fault. The control detected a problem with the drying vent (the flap that opens to release steam), often a wiring fault or a stuck vent. It generally needs service to the vent assembly or its harness.

What causes Frigidaire UO?

The most likely cause is loose or damaged vent assembly wiring. Other causes include Stuck or jammed vent flap/plunger; Failed vent assembly; Faulty main control board.

Can I fix Frigidaire UO myself?

Some checks are DIY, but this code often points to an internal component, so it may need a qualified technician.