Dacor Oven Error Code L23

L23 indicates that the lower oven ambient temperature has exceeded 80°C (176°F) as measured by the thermistor on the relay board. This is not the cooking temperature but rather the temperature of the air surrounding the internal electronic components. The fault is triggered to protect the relay board and other heat-sensitive parts from thermal damage. Restricted airflow is the most frequent cause of this condition.

It is not recommended to continue operating the oven while L23 is active. The fault indicates that temperatures around the relay board and electronics have reached a potentially damaging level. Continued use under this condition risks permanent damage to control components and could create a broader electrical failure. The oven should be left off until the cause of the overheating is identified and resolved.

If the fault is caused only by a blocked vent or inadequate clearance, the repair may cost nothing beyond your time to clean and inspect the unit. If a cooling fan motor needs replacement, parts and labor costs typically range from around $150 to $350 depending on the specific model and technician rates. A relay board replacement is generally more expensive, often falling in the range of $250 to $550 or more for parts and labor combined. Getting a diagnosis from a certified Dacor technician before purchasing parts is strongly recommended.

Start by inspecting the exhaust area, the inlet at the bottom of the door, and the inlet grill for any blockages such as grease, debris, or foreign objects, and clear them completely. Also confirm that the oven has adequate clearance around it as required by the installation specifications. If the vents are clear and the error persists, the cooling fan motor, the relay board thermistor, and the relay board itself should be tested for proper operation. A qualified technician can perform resistance and voltage checks on these components to isolate the fault.

A power reset by unplugging the oven or switching off the circuit breaker for a few minutes may temporarily clear the L23 code, but it will return if the underlying cause is not corrected. If the vent pathways are blocked or the cooling fan is not functioning, the ambient temperature will climb above 80°C again during the next use and trigger the fault again. Clearing the code without addressing the root cause does not resolve the problem.