Frigidaire Dishwasher Code Tu: Turbidity Sensor Trouble
On Frigidaire Professional fully integrated direct-feed dishwashers, such as PLD4555RFC0 and PLD4375RFC0, tu means the control has detected a failure in the turbidity sensor. That sensor measures how cloudy the wash water is, which helps the…
- Code
- tu
- Appliance
- Dishwasher
- Brand
- Frigidaire
- Warranty
- 30-day workmanship
What tu means
On Frigidaire Professional fully integrated direct-feed dishwashers, such as PLD4555RFC0 and PLD4375RFC0, tu means the control has detected a failure in the turbidity sensor. That sensor measures how cloudy the wash water is, which helps the control judge how dirty the load is. The code is tied to the Water Service test, so it shows when you are running that test. These older dishwashers are still in many homes, and we repair them.
Common causes of tu
- The turbidity sensor in the water circuit
- The wiring and plug connection to the sensor
- The input on the control that reads it
- Residue or film on the sensor from hard water or detergent
1. Cancel the test and run a normal cycle to see whether the dishwasher washes and drains. 2. Use a fresh dose of detergent for that cycle. 3. Check that the lower spray arm turns freely and the filter is clean. 4. If tu returns, call us to schedule service.
- tu tells us the control did not like the sensor reading during the test; it does not say whether the sensor is dirty, open or wired badly.
- We check the sensor and its connection, then the control input.
- We tell you before any work starts if the repair costs more than the dishwasher is worth.
Other Dishwasher codes
Does tu mean the dishwasher cannot wash?
Not necessarily. The code is tied to the Water Service test, so it shows during that test. We check how the dishwasher behaves in a normal cycle as part of the visit. That is why the readout appears in the test rather than in an ordinary wash.
What does a turbidity sensor do?
It looks at how cloudy the water is. The control uses that information to judge how dirty the dishes are and how long the wash should be. Many owners notice nothing wrong in daily use.
Do you repair older Professional dishwashers?
Yes. We repair these direct-feed models, quote the price in writing before work, and say plainly when a repair does not make sense. We still test the sensor, because a sensor that reads wrongly can affect how long the wash runs.
Still seeing tu?
A technician diagnoses it on site and gives you the price in writing before any work starts.