Dacor Range, Oven, Cooktop Error Code L3

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.

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.

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.

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.

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.