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Error code reference

Zenith Dishwasher Error Code F13

Temperature sensor low

Zenith codesZenith dishwasher codes

Temperature sensor low - Temperature sensing or stuck at a low reading.

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What F13 means on a Zenith dishwasher

The F13 error code on a Zenith dishwasher indicates a fault in the temperature sensing circuit, specifically that the sensor is reading an abnormally low temperature or has become stuck at a fixed low value. The temperature sensor, typically a negative temperature coefficient (NTC) thermistor, is responsible for monitoring water temperature throughout the wash and rinse cycles. When the control board receives a signal that falls below the expected threshold or detects no change over time, it interprets this as a sensor failure and triggers the F13 code to halt or interrupt the cycle.

The most frequent cause of this fault is a failed or degraded NTC thermistor. In a healthy thermistor, resistance decreases as temperature rises. If the sensor shorts internally or its resistance drops to near zero, the control board sees an implausibly cold reading regardless of actual water temperature. Wiring issues between the sensor and the control board, such as damaged insulation, corrosion at the connector pins, or a broken wire, can produce the same low-signal symptom.

In some cases, the control board itself may misinterpret valid sensor data due to a firmware glitch or component fault on the board. A power reset will sometimes clear a transient software error, but if the F13 code returns immediately, a physical component failure is the likely source. Diagnosing this fault accurately requires measuring the thermistor resistance with a multimeter and comparing it against the expected values at a known temperature.

Source: manufacturer service documentation.

Common causes of F13

  1. 01

    Failed NTC thermistor

    Part replacement

    The temperature sensor itself has shorted or degraded, causing it to report a constant low resistance value that the control board interprets as an impossibly cold temperature. Testing the thermistor with a multimeter will reveal a resistance reading that does not change with temperature or reads near zero ohms.

  2. 02

    Corroded or disconnected wiring connector

    Wiring / connection

    Corrosion, moisture damage, or a loose pin at the connector between the thermistor and the control board can interrupt the signal and cause a low or absent reading. Inspect the connector terminals for green or white oxidation and ensure the connector is fully seated.

  3. 03

    Damaged wiring harness

    Part replacement

    A broken or pinched wire in the harness running from the thermistor to the control board can drop the signal to zero, mimicking a shorted sensor. Visually inspect the harness for chafing, burns, or crimps and use a multimeter to check continuity along the wire.

  4. 04

    Transient control board software glitch

    Wiring / connection

    Occasionally a temporary error in the control board firmware causes a false low-temperature reading without any physical sensor failure. Cutting power to the dishwasher for several minutes and restarting may clear this, but if the code returns, a hardware fault is more likely.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and wiring both test correctly, the control board may have a failed input circuit that is misreading the sensor signal. This is the least common cause and should only be considered after the sensor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about F13

What does F13 mean on a Zenith dishwasher?
F13 on a Zenith dishwasher indicates a temperature sensor fault where the sensor is reading an abnormally low value or is stuck at a fixed low reading. The dishwasher uses a thermistor to monitor water temperature throughout its cycles, and when that sensor signal falls outside the expected range, the control board logs F13. This fault prevents the dishwasher from completing a full cycle until the issue is resolved.
Can I fix the F13 error on my Zenith dishwasher myself?
If the fault is caused by a loose connector or a transient glitch, a knowledgeable DIYer can resolve it without professional help by reseating the wiring connector or resetting the power. Replacing the NTC thermistor is also a straightforward repair for someone comfortable with basic appliance work, as it typically involves disconnecting the harness and unclipping the sensor. However, if the control board is the source of the fault, replacement is more complex and may be better suited to a technician.
Is it safe to keep using my dishwasher with an F13 error?
Running the dishwasher with an active F13 fault is not recommended. Without accurate temperature feedback, the control board cannot confirm that water is reaching the temperatures needed for effective cleaning and sanitation. In some cases the dishwasher may stop mid-cycle, and over time operating without proper temperature control could lead to poor wash results or additional component stress.
Will resetting my Zenith dishwasher clear the F13 error?
A power reset, achieved by unplugging the unit or turning off its circuit breaker for a few minutes, can clear the F13 code if it was caused by a temporary software glitch. If the code returns after the reset and the dishwasher attempts a new cycle, a physical component failure such as a faulty thermistor or damaged wiring is the cause and must be addressed directly.
How much does it cost to repair an F13 error on a Zenith dishwasher?
Repair costs depend on which component has failed. A replacement NTC thermistor is generally an inexpensive part, with the component itself typically ranging from around $10 to $40 and labor adding $50 to $150 if a technician performs the work. If the control board requires replacement, total repair costs including parts and labor can range from $150 to $350 or more depending on the board price and local service rates.

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