The UO error code appears similarly in all Frigidaire dishwasher models. The wash tank filling process begins, followed by 3–4 clicks. The unit will drain water if you hit Cancel. However, the issue will recur with the next power-up. In this article, Jacob Dillard, an engineer at Appliance Repair Expert, will explain the main causes of this error and how to fix it.
According to the Frigidaire dishwasher manual, this fault code indicates a failure of the ventilation subunit or mainboard. The manufacturer recommends replacing them with new ones without inspecting and repairing them. On the other hand, some users come up with more cost-effective remedies after discovering the main reasons for the problem.
The fan has a wiring harness that extends through the bottom of the door to the control module. Using a multimeter, check their integrity. Ensure the electrical connections don’t become corroded when they get wet. It prevents the signal from passing through. The system does not receive a notification that the vent is closed. As a result, the error code UO is displayed.
With a wire brush, clean the rusty contacts and add dielectric oil. Tighten up any loose joints. If the harness cannot be repaired, it should be replaced.
Sometimes, it isn’t enough, and Frigidaire dishwasher error codes reappear. In this situation, clean the little optical sensor that informs the board of the plunger’s location. On a flat plate at the rear of the valve, the sensor element, labelled U1, is situated. Plaque may be removed using a nylon brush and lens solution.
According to the manufacturer, this dishwasher component cannot be examined or fixed since the mechanism has been designed to be maintenance-free. In this case, it is simply recommended to replace the ventilation component. Furthermore, there are no assurances that such a solution will work since the next option for replacement – a control board – may also be defective.
Some people have figured out how to circumvent the “prohibition” on their own. It works if the optical sensor fails to accurately identify the position of the slider, resulting in the error code UO. To see whether it’s true, you’ll need to do the following:
However, the engine might be an issue. The plunger will not shut the slider if the wax motor breaks, and the error UO disappears. This component is not repairable; you must replace the subunit completely.
Frigidaire recommends replacing this component next. To get to it, loosen the front of the dishwasher’s screws, then remove the front panel and the waterproof covering. Check for corrosion and damage on the mainboard.
The UO error code for Frigidaire dishwashers indicates a faulty ventilation assembly and wiring, or in rare cases, the main control board. Troubleshooting should begin with checking the wiring harness, purge valve sensor, and ventilation assembly components. This will often resolve the UO error and avoid the need to replace parts.
UO error codes can usually be resolved by carefully diagnosing and cleaning or replacing parts. In the case of a dishwasher wax motor failure, the entire vent assembly must be replaced. We highly recommend using a professional for such repairs so you don’t permanently break your home appliance. Appliance Repair Expert is a company that specializes in repairs of any complexity. Call us now and get your unit fixed on the same day.
Problems with dishwasher repair? Our craftsmen are able to easily ensure the preservation of the original condition of the dishwasher. Our team is to easily perform any service related to the repair of such equipment.
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