This problem can develop because of a dirty sensor, faulty electrical connections, or wastewater flowing back into the dishwasher. Fortunately, some simple troubleshooting steps can help you identify the cause and restore normal operation.
What Does the KitchenAid Dishwasher Error Code 3-3 Mean?
The KitchenAid dishwasher error code 3-3, also displayed as F3E3 on certain models, means the Optical Water Indicator sensor has failed to calibrate properly. This sensor helps the dishwasher measure how dirty the wash water is so the control system can adjust washing operations when necessary.
The OWI sensor uses an optical sensing system to detect particles in the water. On many KitchenAid models, it’s located near the bottom of the dishwasher and works alongside a temperature sensor. During calibration, the dishwasher checks the sensor’s readings to determine whether it can accurately identify water conditions.
If the sensor lens becomes covered with grease, food residue, or mineral deposits, it may struggle to detect water conditions correctly. A defective sensor or damaged electrical connection can produce the same error. In some cases, wastewater flowing backward through the drain hose can interfere with calibration because the sensor encounters dirty water when it expects relatively clean water.
A recurring 3-3 error may be accompanied by poor washing results or unexpected changes in cycle operation. However, the code itself identifies a calibration failure rather than confirming that the sensor needs replacement. The exact symptoms and diagnostic procedures can also vary between KitchenAid dishwasher models.
KitchenAid Dishwasher Error Code 3-3: Common Causes
Several problems can prevent the OWI sensor from calibrating correctly. The most likely causes involve contamination around the sensor, drainage problems, or faults in the sensor’s electrical circuit.
1. Dirty or Cloudy OWI Sensor Lens
The OWI sensor relies on a clear optical lens to measure particles suspended in the dishwasher’s wash water. When that lens becomes covered with grease, detergent residue, or mineral deposits, the sensor may produce inaccurate readings.
This usually develops gradually as food particles and other deposits accumulate inside the dishwasher. Hard water can contribute to mineral buildup, while excessive detergent or poor rinsing may leave a cloudy film on internal surfaces.
You might notice dishes coming out with food particles or a cloudy appearance. The dishwasher’s interior may also have visible residue around the bottom. However, these symptoms can have other causes, so they don’t necessarily confirm that the OWI lens is dirty.
If the lens becomes too cloudy, the dishwasher may struggle to recognize clean water during calibration. Cleaning the affected surface may resolve the issue, provided the sensor itself hasn’t developed an electrical fault.
2. Faulty Optical Water Indicator Sensor
A defective OWI sensor is another established cause of the KitchenAid dishwasher 3-3 error code. The sensor contains electronic components that detect changes in water clarity and send readings to the dishwasher’s control board.
If these components fail, the sensor may no longer provide accurate information. Consequently, the dishwasher might continue reporting a calibration problem even when the water is clean and the sensor lens has been inspected.
A failing sensor can sometimes cause inconsistent washing performance. For example, a dishwasher may struggle to adjust its washing operation appropriately because the control system isn’t receiving reliable information about water conditions.
However, replacing the sensor immediately isn’t the best approach. Similar symptoms can occur when its wiring is damaged or dirty water enters the dishwasher after draining.
A technician can use the dishwasher’s service diagnostic system to check whether the OWI sensor detects clean water correctly. If the sensor consistently fails these tests despite proper cleaning and sound electrical connections, replacement may be necessary.
3. Failed Drain Hose Check Valve
The drain hose check valve helps prevent wastewater from flowing backward into the dishwasher after draining. If this valve stops sealing properly, dirty water may return to the dishwasher tub.
This matters because the OWI sensor needs relatively clean water during calibration. If wastewater containing detergent residue and food particles flows back into the dishwasher, the sensor may register an unexpectedly high soil level.
You may notice cloudy water collecting at the bottom of the dishwasher after a completed cycle. In some cases, unpleasant odors develop because wastewater is returning from the drain connection.
KitchenAid’s technical documentation identifies a leaking drain hose check valve as a possible cause of the 3-3 calibration error. When the valve fails, replacing the affected drain hose assembly may be necessary, depending on the model.
4. Incorrect Drain Hose Installation
Even when the check valve works correctly, an improperly installed drain hose can create wastewater problems. This is particularly relevant if your dishwasher was recently installed or moved.
The drain hose must follow the installation requirements for your model, including the correct routing and any required air gap or high loop. A high loop raises the drain hose beneath the countertop before it connects to the sink drain or garbage disposal.
Without suitable protection against backflow, wastewater from the sink may enter the dishwasher. This can leave dirty water inside the appliance and interfere with the OWI sensor’s ability to calibrate.
A common clue is water reappearing in the dishwasher after it has finished draining, especially following sink use. However, a small amount of water remaining in the sump beneath the filter may be normal.
An incorrectly routed hose may be easy to identify by looking beneath the kitchen sink. If the hose is hanging too low, sharply bent, or incorrectly connected, it may need to be repositioned according to the manufacturer’s installation instructions.
5. Damaged Sensor Wiring or Control Board
The OWI sensor communicates with the dishwasher’s electronic control board through a wiring harness. If the electrical connections become loose or damaged, the control board may receive incomplete or unreliable sensor information.
A damaged wire, corroded terminal, or disconnected plug can interrupt this communication. The dishwasher may then report a calibration error even though the sensor’s optical components are still working.
In less common cases, the control board’s sensor input circuit may develop a fault. This can prevent the dishwasher from interpreting the sensor readings correctly.
These problems are difficult to distinguish through ordinary observation. The dishwasher might continue washing while repeatedly recording the 3-3 error.
A technician can inspect the soil sensing circuit and test its connections using the wiring diagram for your model. Control board replacement should only be considered after the sensor, wiring, and drainage system have been checked.
KitchenAid Dishwasher Error Code 3-3: How to Fix
Start with the simplest checks before considering replacement parts. The following methods can help resolve temporary faults, reduce contamination, and identify drainage problems that interfere with sensor calibration.
1. Reset Your KitchenAid Dishwasher
A power reset can sometimes clear a temporary electronic fault and allow the dishwasher’s controls to restart normally. It’s worth trying if the 3-3 error appeared unexpectedly.
First, make sure the dishwasher isn’t actively washing or draining. If necessary, press Cancel/Drain and allow the appliance to finish removing water.
Next, follow these steps.
-
Turn off the dishwasher.
-
Unplug it from the electrical outlet if the plug is safely accessible.
-
If it’s hardwired or the plug is inaccessible, turn off its dedicated circuit breaker.
-
Wait at least one minute.
-
Restore electrical power.
-
Select a normal wash cycle and start the dishwasher.
After restoring power, check whether the error disappears. If the dishwasher operates normally, monitor the next few cycles to see whether the code returns.
However, resetting won’t repair a damaged sensor or drain hose check valve. If the error continues appearing, you’ll need to investigate the physical causes rather than repeatedly resetting the appliance.
2. Clean the Dishwasher Filter and Accessible Sump Area
Food particles and detergent buildup can affect the cleanliness of the water circulating inside your dishwasher. Cleaning the filter and accessible areas around the sump can help reduce contamination.
The sump is the collection area at the bottom of the dishwasher where water gathers before circulating or draining. On many KitchenAid models, the filter assembly sits above or near this area.
Before cleaning, switch off the dishwasher and allow the interior to cool.
Remove the lower dish rack and locate the filter assembly. If your model has a removable filter, follow the owner’s manual to unlock and lift it out.
Rinse the filter under warm running water, using a soft brush to remove stubborn food residue. Avoid wire brushes and sharp tools because they can damage the filter material.
Next, inspect the exposed, accessible area around the filter opening. Remove visible food particles using a soft cloth, taking care not to push debris into the drain.
If the OWI sensor lens is accessible and your model’s maintenance instructions permit cleaning it, gently wipe the exposed surface. Otherwise, leave the sensor in place. Removing it may require accessing components beneath the dishwasher.
Reinstall the filter securely before operating the appliance. Some KitchenAid models use different filtration systems, so don’t attempt to remove components that aren’t designed for routine cleaning.
Once everything is reassembled, run a normal cycle and check whether the error returns. Cleaning may improve water clarity, but a persistent calibration fault requires additional checks.
3. Run a Dishwasher Cleaning Cycle
A cleaning cycle can help remove grease, soap film, and mineral deposits from the dishwasher’s interior. This may be useful if the 3-3 error is related to contamination around the water sensing system.
Start by removing all dishes and checking that the filter is clean. Next, select a dishwasher cleaning product approved for use with your appliance.
Follow the cleaner manufacturer’s instructions for placement, quantity, and cycle selection. Some products require a normal wash cycle, while others specify a particular cleaning program.
Avoid mixing cleaning products or adding household bleach to other cleaners. Chemical combinations can produce harmful fumes and may damage dishwasher components.
After the cleaning cycle finishes, inspect the interior for remaining residue. The tub should look cleaner, and any stale odors caused by ordinary buildup may be reduced.
A cleaning cycle can improve general cleanliness, but it may not remove deposits from a heavily contaminated OWI lens, particularly when the sensor surface isn’t directly exposed to the wash water in an accessible way.
If the 3-3 error remains, cleaning alone hasn’t resolved the calibration problem. The sensor may need direct inspection or electrical testing.
4. Inspect the Drain Hose and Sink Connection
Because dirty water flowing backward can contribute to this error, checking the dishwasher’s drain hose is particularly important.
Start by looking under your kitchen sink. Find the flexible hose connecting your dishwasher to the sink drain, air gap, or garbage disposal.
Check whether the hose is sharply bent, crushed, or hanging unusually low. Also, look for loose connections, moisture, or evidence of leaking.
If your installation requires a high loop, the hose should rise and be securely supported near the underside of the countertop before connecting to the drain. Some installations require an air gap instead, depending on local plumbing rules.
If the hose has slipped from its support, repositioning and securing an accessible section may help. However, follow your dishwasher’s installation instructions rather than guessing the correct hose height or routing.
Also, check whether the sink or garbage disposal drains normally. A blocked sink drain can create wastewater problems that affect the dishwasher connection.
If you suspect a faulty internal drain check valve, don’t assume that adjusting the hose will solve it. The valve or drain hose assembly may need replacement.
5. Check Whether Dirty Water Returns After Draining
Observing what happens after the dishwasher drains can provide useful clues about a possible backflow problem.
First, make sure the filter and accessible sump area are clean. Then, run a short wash cycle or use the dishwasher’s drain function, following your owner’s manual.
Once the drain operation finishes, allow the dishwasher to stop before opening the door. Look for standing water above the normal sump area.
A small amount of water below the filter may be normal on certain models. However, a noticeable pool of cloudy water covering the tub floor deserves attention.
If the dishwasher appears to have drained correctly, check again after some time, particularly after the kitchen sink has been used. Water that returns without the dishwasher running may indicate backflow through the drainage system.
This observation doesn’t prove that the check valve has failed. An incorrectly installed hose, a blocked sink connection, or another drainage problem can produce similar results.
If wastewater repeatedly returns, stop using the dishwasher until the drainage issue is corrected. A plumber or appliance technician can test the check valve and determine whether the hose assembly requires replacement.
6. Contact a Qualified Appliance Repair Technician
If the 3-3 error continues after cleaning, resetting, and checking the drainage system, the OWI sensor and its electrical connections need closer inspection.
A qualified technician can run the dishwasher’s service diagnostic cycle to determine whether the sensor recognizes clean water correctly. This helps distinguish a contaminated lens from a defective sensor or electrical connection.
The technician can also inspect the sensor lens for scratches, test the wiring harness, and check the electronic control board if necessary.
If the OWI sensor needs replacement, the correct part must match your dishwasher model. On applicable KitchenAid models, a service diagnostic cycle is also required after replacement so the dishwasher can perform calibration during a subsequent normal wash cycle.
Avoid removing internal electrical panels or testing live circuits yourself. These procedures involve electrical hazards and require appropriate equipment.
Before arranging service, locate your dishwasher’s model number, usually printed on a label around the door opening or tub frame. Also, note when the error appears and whether dirty water returns after draining.
Providing these details can help the technician narrow down the possible causes and choose the appropriate diagnostic checks.
Wrap-Up
The KitchenAid dishwasher error code 3-3 indicates that the Optical Water Indicator sensor hasn’t calibrated correctly. Common reasons include a dirty sensor lens, a defective OWI sensor, damaged wiring, or wastewater returning through the drain hose.
Start by resetting the dishwasher, cleaning the filter, and checking the drain hose for obvious problems. If the error persists, professional testing can identify whether the sensor or another component needs replacement. Addressing the underlying fault will help restore accurate water sensing and reliable washing performance.