Getting uo error code on my new frigidaire dishwasher

Good Morning Friend, this is Z. Thank you for your question!

Error code UO commonly means that the vent is in an open position. While your Frigidaire dishwasher is in wash cycle, the main control board is not receiving signal from the vent assembly.

Before reaching out to a professional, let's try resetting your dishwasher. This can be done by flipping the household circuit breaker off. It is important to wait approximately ten minutes and then turn on your dishwasher. This often clears most false-error codes. If resetting the power does not correct the issue, a professional will need to check the wiring between the vent assembly and main control board.

Best of luck!

Hi Mark, thank you for your post!

Error code UO commonly means that the vent is in an open position. While your Frigidaire dishwasher is in wash cycle, the main control board is not receiving signal from the vent assembly.

Before reaching out to a professional, let's try resetting your dishwasher. This can be done by flipping the household circuit breaker off. It is important to wait approximately ten minutes and then turn your dishwasher on. This often clears most false-error codes. If resetting the power does not correct the issue, a professional will need to check the wiring between the vent assembly and main control board.

Best of luck!

Hello Teresa Ann - Typically error code UO indicates that while the dishwasher is in wash cycle, the main control board is not receiving signal from the vent assembly and that the vent plunger is in a closed position. A professional will need to check the wiring between both parts and depending from the results either part may need replacing.

You are experiencing a vent issue - While in wash cycle, Main Control Board does not receive signal from vent assembly that vent plunger is closed. Plunger status is sensed with optical sensor in vent assembly. Check wiring between vent assembly and Main Control Board. If wiring correct, replace vent assembly. If error still exist, replace Main Control Board.

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uo means that the vent isnt closed

I have a similar problem with my Frigidaire FDB4050LHS1. My Owner's Manual says to contact the Customer Care Center if the display shows "Er", "uF", or "CE". When I called them, Maria didn't have a clue what the codes meant - all she could do was give me phone numbers to authorized service centers in my area.

I managed to get ahold of a "SERVICE DATASHEET" P/N: 154718601. The error code "ER/ER" means there is a "switch failure"; "ER/CE" denotes a "Configuration Error"; "ER/uo" means "Vent will not close"; and "ER/UF" means "Fan not running".

The schematic only labels three switches - labeled "USER INTERFACE SWITCH", "DOOR SWITCH", and "FLOAT SWITCH". There is also a switch in the pump motor assembly. If either the door or user interface switch is faulty, then you probably won't be able to do anything other than call a repair service - unless you know how to replace these switches yourself.

If the float switch is causing the error, you might be able to run the "Water/Service Test". From "PF" (denoting a Power Failure) or idle mode (with no lights on whatsoever), press and hold the "DRY/AIRDRY" and "START/CANCEL" buttons at the same time for 3 seconds. This will start an 8-stage test that runs for about 7 and 1/2 minutes. The display will show which step the test is in until it shows an error code. Step 1 tests the water valve, which is where the float switch is located. If that switch is bad, you will likely see "Uo" displayed within the first minute of the test.

We had the same problem with our Frigidaire dishwasher (different model though). We called them and they said the UO stands for Vent Open (the display can't make a V so it makes a U). The active vent was not closing when it should be closed (the repairman said the gasket was stuck up in the assembly so sometimes it would seal and sometimes it wouldn't) and thus the error. Since our machine was still under warranty, we had the vent replaced at no cost and haven't had the problem since.

So far so good. I fixed mine by removing the vent and even though it says no repairable parts I disassembled it then removed the rubber gasket and cleaned it with a brush under hot water. I then cleaned the plastic ring it seals against. Next I removed the spring and stretched it to make it about a quarter inch longer and then reinstalled the spring then the rubber gasket and then closed up the unit. So far it is working fine. I suspect the real problem is that there is a tiny sensor that needs to be covered when the vent is closed. If this is not covered the uo error code is generated.