Dacor Oven Error Code U23

U23 means the thermistor on the relay board in your upper or single oven has detected an ambient temperature above 80°C (176°F). This is a protective fault that monitors heat levels around the oven's control electronics, not the cooking cavity temperature. It is triggered when cooling airflow is insufficient or when a component in the electronics area is failing. The oven generates this code to prevent heat damage to the relay board and related parts.

It is not recommended to continue operating the oven while U23 is active. The code indicates that the electronics area is overheating, which can cause damage to the relay board and control components if the oven continues running. Address the ventilation or component issue first before using the oven again.

If the fault is simply blocked vents, the repair costs nothing beyond cleaning time. If a cooling fan needs replacement, parts and labor typically range from $150 to $350. Relay board replacement is generally more expensive, often falling in the $300 to $600 range depending on the specific model and labor rates in your area. Getting a diagnostic call from a certified Dacor technician, usually $75 to $150, will help identify the exact faulty component before committing to parts costs.

In many cases, yes. Start by checking the exhaust area, the inlet at the bottom of the door, and the inlet grill for any blockages such as grease buildup or debris, and clear them if found. After clearing the vents, run the oven in normal mode and confirm it heats correctly. If the code returns after the vents are clean and clearances are correct, diagnosing or replacing the cooling fan, thermistor, or relay board will likely require a qualified technician.

A reset may temporarily clear the U23 code, but if the underlying cause, such as a blocked vent or a failing component, has not been resolved, the fault will return once the relay board thermistor reaches 80°C again. Always address the root cause before relying on a reset as a solution.