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Error code reference

Dacor Range Oven Cooktop Error Code L3

Third Gen Dishwasher: Thermistor fault

Dacor codesDacor range oven cooktop codes

Third Gen Dishwasher: Thermistor fault - stopped or less than 80°C/176°F.

First step from the service manual

Check thermistor and control unit.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What L3 means on a Dacor range oven cooktop

The L3 error code on Dacor third generation dishwashers indicates a thermistor fault, specifically that the thermistor has either stopped functioning entirely or is reading a temperature below 80 degrees Celsius (176 degrees Fahrenheit). The thermistor is a temperature-sensing resistor embedded in the wash system that continuously monitors water temperature and reports that data to the main control unit. When the control unit receives a signal that falls outside the expected operating range, or receives no signal at all, it triggers the L3 fault to halt operation and prevent potential damage or unsafe conditions.

The two most common root causes are a failed thermistor and a fault in the control unit itself. A thermistor can fail in several ways: the component may develop an open circuit (no signal), a short circuit (incorrect fixed reading), or physical damage from heat or moisture exposure over time. Wiring between the thermistor and the control board is also a point of failure, as corroded connectors or broken leads can interrupt the signal path and mimic a thermistor fault even when the sensor itself is functional.

Diagnosing L3 correctly requires checking the thermistor resistance against its specified values at a known temperature, inspecting the wiring harness and connectors for continuity and corrosion, and evaluating the control unit if the thermistor and wiring both check out. Because both components are implicated in this fault, a systematic approach starting at the thermistor and working toward the control board will yield the most reliable diagnosis.

Source: manufacturer service documentation.

Common causes of L3

  1. 01

    Failed thermistor

    Part replacement

    The thermistor itself may have developed an open or short circuit, causing it to send no signal or an out-of-range reading to the control board. Testing the thermistor with a multimeter for proper resistance at a known temperature will confirm whether it has failed.

  2. 02

    Damaged or corroded wiring harness

    Wiring / connection

    The wiring and connectors between the thermistor and the control unit can corrode, break, or pull loose over time, interrupting the signal without the thermistor itself being faulty. Inspect all connectors and leads in the circuit for visible damage, corrosion, or poor contact.

  3. 03

    Faulty control unit

    Part replacement

    If the thermistor and wiring both test correctly, the main control unit may have failed and is no longer able to accurately read or process the thermistor signal. A control board fault will produce this code even when the sensor is working as intended.

  4. 04

    Thermistor connector not fully seated

    Wiring / connection

    A loose or partially disconnected thermistor connector can cause an intermittent or complete loss of signal to the control unit. Reseating the connector firmly and checking for secure contact may resolve the fault without replacing any components.

See the test procedure for each cause

Frequently asked questions about L3

What does L3 mean on a Dacor range, oven, cooktop?
The L3 code on a Dacor third generation dishwasher signals a thermistor fault, meaning the temperature sensor has stopped working or is reading below 80 degrees Celsius (176 degrees Fahrenheit). The control unit monitors this sensor continuously and stops the machine when the reading falls outside acceptable limits. This is a protective fault designed to prevent the appliance from operating without reliable temperature data.
Can I fix the L3 error myself?
A knowledgeable DIYer can attempt basic diagnostics such as inspecting the wiring harness, checking connectors for corrosion, and reseating the thermistor connector. Testing the thermistor itself requires a multimeter and some familiarity with resistance measurements. Replacing the thermistor is a moderately accessible repair, but replacing the control unit is more involved and may be better handled by a qualified technician.
Will resetting the dishwasher clear the L3 code?
A reset may temporarily clear the L3 code, but if the underlying thermistor or wiring fault is still present, the code will return once the appliance attempts to run a cycle. A reset is useful for confirming whether the fault is intermittent, but it is not a fix for a failed thermistor or damaged wiring. Persistent return of the code after a reset indicates that a component repair or replacement is needed.
Is it safe to use my Dacor dishwasher while the L3 code is active?
Running the dishwasher with an active L3 fault is not recommended. The appliance has stopped because it cannot verify water temperature, which means it may not sanitize dishes properly and could operate in an unpredictable state. It is best to leave the unit off until the thermistor or control unit fault has been diagnosed and corrected.
How much does it cost to repair an L3 error on a Dacor dishwasher?
Repair costs vary depending on which component has failed. Thermistor replacement is generally the less expensive repair, with parts and labor typically ranging from around 80 to 200 dollars. Control unit replacement is considerably more costly, often falling in the range of 200 to 500 dollars or more depending on parts availability and labor rates in your area. Getting a diagnostic assessment first will help clarify which repair is actually needed before committing to parts.

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