mypros+
Error code reference

Zenith Dishwasher Error Code F23

Low rinse aid

Zenith codesZenith dishwasher codes

Low rinse aid - Low rinse aid is detected in the unit.

MyPros+ Max

Get the full diagnostic procedure for F23.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F23 means on a Zenith dishwasher

The F23 error code on a Zenith dishwasher indicates that the rinse aid reservoir has dropped to a low level. The dishwasher monitors the rinse aid dispenser through a float-based or optical sensor integrated into the dispenser assembly. When this sensor detects that the rinse aid level has fallen below a minimum threshold, the control board triggers the F23 alert to notify the user that a refill is needed before optimal drying and spot-free rinsing performance can be maintained.

Rinse aid plays a critical role in the final rinse cycle. It reduces the surface tension of water, allowing it to sheet off dishes and glassware more effectively. Without adequate rinse aid, water tends to bead and leave mineral deposits or water spots, particularly on glass and stainless steel items. The dispenser releases a metered dose of rinse aid during the final rinse, and the reservoir typically holds enough for multiple wash cycles before requiring a refill.

In most cases, F23 is a maintenance notification rather than a component failure. However, if the code persists after the reservoir is properly filled, the dispenser sensor or the dispenser assembly itself may be faulty. A stuck float sensor or a failed optical sensor would cause the control board to read the reservoir as empty even when it contains sufficient rinse aid. In that scenario, inspecting or replacing the dispenser assembly would be the appropriate next step.

Source: manufacturer service documentation.

Common causes of F23

  1. 01

    Depleted rinse aid reservoir

    Wiring / connection

    The most frequent cause is simply that the rinse aid has been used up over multiple wash cycles. Check the dispenser window or indicator on the door and refill as needed.

  2. 02

    Faulty rinse aid float sensor

    Part replacement

    A stuck or failed float sensor inside the dispenser can report a low level even when the reservoir is full. If the code reappears immediately after filling, inspect the float for debris or damage.

  3. 03

    Failed optical rinse aid sensor

    Part replacement

    Some Zenith dishwasher models use an optical sensor to detect rinse aid level. If this sensor becomes coated with residue or fails electrically, it may continuously trigger F23 regardless of actual fill level.

  4. 04

    Leaking dispenser assembly

    Part replacement

    A cracked or improperly sealed dispenser can allow rinse aid to leak out faster than normal, causing the reservoir to deplete quickly and trigger the F23 code sooner than expected.

  5. 05

    Control board misread

    Part replacement

    In rare cases, the main control board may incorrectly interpret the sensor signal and display F23 even with a full and properly functioning dispenser. This is typically diagnosed only after ruling out all dispenser-side causes.

See the test procedure for each cause

Frequently asked questions about F23

What does F23 mean on a Zenith dishwasher?
F23 on a Zenith dishwasher means the appliance has detected a low level of rinse aid in the dispenser reservoir. It is primarily a maintenance reminder to refill the rinse aid compartment. If the code appears right after refilling, a faulty sensor in the dispenser assembly may be the underlying cause.
How do I fix the F23 error on my Zenith dishwasher?
Start by opening the rinse aid dispenser cap on the interior of the door and filling the reservoir with standard dishwasher rinse aid until it reaches the full line. Run a complete wash cycle and check whether the code clears. If F23 persists after refilling, the dispenser sensor or assembly may need to be inspected and potentially replaced.
Will resetting my Zenith dishwasher clear the F23 code?
A reset alone is unlikely to permanently clear F23 because the sensor will continue to detect a low rinse aid level on the next cycle. The correct fix is to refill the rinse aid reservoir first. After refilling, the code should clear automatically once the sensor confirms an adequate level, either immediately or after a wash cycle completes.
Is it safe to run my Zenith dishwasher with the F23 error showing?
F23 does not indicate a mechanical or electrical hazard, so running the dishwasher is generally safe. However, operating without sufficient rinse aid will result in poor drying performance and water spots on dishes and glassware. It is best to refill the rinse aid before the next wash to maintain cleaning quality.
How much does it cost to fix the F23 error on a Zenith dishwasher?
If the fix is simply refilling the rinse aid, the cost is minimal, typically in the range of a few dollars for a bottle of rinse aid. If the dispenser sensor or full dispenser assembly needs replacement, parts and labor costs can range from around $50 to $150 depending on the specific component and whether a technician is needed.

Related Zenith dishwasher codes

All Zenith dishwasher codes
View all 22 Zenith dishwasher codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass