Dacor Oven Error Code L20

The L20 code means the lower oven experienced an over-temperature condition, with the center of the oven cavity exceeding 610°F for 2 or more minutes during cook mode. The oven's control system triggers this fault as a protective measure to prevent damage. It is not a code that should be ignored, as it indicates either a real overheating event or a sensor or calibration issue causing a false reading.

Power cycling the oven may temporarily clear the L20 code, but if the underlying cause is not corrected, the fault will return once the oven is used again. A reset does not fix a faulty temperature probe, a stuck relay, or a calibration mismatch. Proper diagnosis of the probe readings, element cycling behavior, and software calibration values is necessary before the oven can be safely returned to service.

Repair costs vary depending on the failed component. A replacement oven temperature probe typically runs in the range of $30 to $80 for parts alone. A control board replacement is considerably more expensive, often ranging from $150 to $400 or more for the part. Adding professional labor costs, total repair bills commonly fall between $150 and $500 depending on the diagnosis outcome and your location.

No, you should not continue using the oven while the L20 code is active. The fault indicates the oven either reached a dangerously high temperature or has a component failure that could lead to overheating. Continued use without resolving the root cause poses a risk of damage to the appliance and potentially to surrounding cabinetry or the home.

Diagnosis should begin by verifying the temperature probe resistance and comparing readings against expected values for the oven model. Next, review cycling and timing charts to confirm the heating element is turning on and off correctly rather than running continuously. Finally, confirm that the calibration values stored in the control board match the installed software version, as a mismatch can cause false over-temperature faults. Depending on the cause found, repair may involve replacing the temperature probe, the control board, or a heating element.