Dacor Range, Oven, Cooktop Error Code U23

U23 indicates that the ambient temperature around the relay board in the upper or single oven has exceeded a safe threshold. The relay board controls power to the oven's heating elements, and this code means the control system has detected dangerously high heat in that area. The oven shuts down to prevent damage to the electronics. The root cause is typically a cooling fan problem or a ventilation restriction.

Resetting the oven by cycling the power at the breaker may temporarily clear the U23 code once the unit cools down, but if the underlying cause is not repaired, the code will return. A reset does not fix a failed cooling fan, a blocked vent, or a faulty relay. Treat a recurring U23 as a persistent mechanical or electrical problem that requires hands-on diagnosis.

Repair costs vary depending on the failed component. A cooling fan motor replacement typically falls in the range of $150 to $350 including parts and labor. Relay board replacement can range from $250 to $600 or more depending on the specific board and labor rates in your area. An oven temperature sensor is generally one of the less expensive components to replace, often in the $100 to $250 range. Obtaining a diagnostic service call first is recommended to confirm the exact cause before committing to parts.

No, you should not continue operating the oven while U23 is active. The code indicates the relay board is being exposed to excessive heat, which can cause permanent damage to the electronics and potentially create a fire risk if a relay is stuck on and the oven is overheating. Power the unit off and allow it to cool completely before attempting any diagnosis.

Start by allowing the oven to cool completely, then check that all ventilation openings are unobstructed and that the unit has proper installation clearances. Listen for the cooling fan during operation since a silent or intermittent fan is a strong indicator of motor failure. If the fan is running normally, the next step is checking the oven temperature sensor and inspecting the relay board for signs of heat damage or a stuck relay. A repair technician will be needed for component-level diagnosis and any parts replacement.