Frigidaire Dishwasher UO Code: Meaning & Fixes
- Meaning
- Vent stuck open: the control did not get a signal that the drying vent closed.
- Can I fix it?
- Sometimes, may need a pro
- Also shown as
- Uo, uo, U0
- Seen on
- Frigidaire dishwashers with a fan-assisted drying vent, such as the FGIP2468UD. The same tech sheet lists uC as vent stuck closed and uF as vent fan speed too low or stopped.
UO on a Frigidaire dishwasher means the drying vent is stuck open: the control didn’t see the vent at the top right rear of the tub close. It is a vent code, not an overflow. Reset the power at the breaker and check that nothing in the upper rack presses on the vent. If UO returns, the vent needs service.
Try this first
- Switch off the dishwasher's breaker for a few minutes, then turn it back on.
- Open the door and check that no tall item or utensil in the upper rack presses on the vent at the top right rear of the tub.
- Run a short cycle to see whether the code returns.
- If UO comes back, book service for the vent assembly and its wiring.
What causes UO
| Cause | What you notice | What to check |
|---|---|---|
| Vent damper stuck open | UO during or after the dry part of the cycle | Needs a technician |
| Something blocking the vent inside the tub | UO after loading tall items at the back right | Top right rear of the tub |
| Loose or damaged vent wiring | UO comes and goes | Needs a technician |
| Control glitch | UO once, then normal after a reset | Breaker reset |
Fix it step by step
Tap a step number to tick it off as you go. Ticks stay on this device.
-
Reset the power
Switch off the dishwasher's circuit breaker for a few minutes, then switch it back on.
Safety: The dishwasher runs on 120 V. Use the breaker, and don't open the door panel or toe kick to look at the wiring.
-
Check the vent area
The drying vent sits at the top right rear of the tub. Make sure no dish, lid or utensil in the upper rack is pressing on it or wedged against it.
-
Run a test cycle
Run a short cycle with an empty dishwasher and see whether UO returns at the end.
-
Book service if it returns
During drying the control opens the vent damper and runs the vent fan, then closes the damper. If UO keeps coming back, the vent assembly or its wiring needs a technician.
Safety: The vent assembly is wired to the control board. Leave replacement and wiring checks to a technician.
When to call a technician
If UO comes back after a breaker reset and the vent area is clear, call Frigidaire service or a technician. The vent assembly or its wiring needs checking, and that means opening the door.
Questions people ask
Does UO mean my Frigidaire dishwasher is overflowing?
No. On Frigidaire's tech sheet UO means the drying vent is stuck open. A leak or water in the base shows as i30.
What's the difference between UO, uC and uF?
All three are vent codes. UO is vent stuck open, uC is vent stuck closed, and uF means the vent fan speed is too low or the fan stopped.
Is it UO or U0?
It is the letter O, for open. People often type it with a zero. It is the same code.