Dacor Oven Error Code U20

The U20 code means the upper oven exceeded 610°F at the center of the cavity for two or more minutes during cook mode. This is an over-temperature protection fault that halts oven operation to prevent damage or a safety hazard. It points to a problem with the temperature sensor, control board relay, or a calibration mismatch between the software version and stored calibration values.

No, you should not continue using the oven while this code is active. The U20 fault indicates the oven has already reached temperatures above 610°F during a cooking cycle, which is well outside normal operating range. Using the oven in this condition could cause damage to internal components or create a fire hazard.

Repair costs depend heavily on the root cause. A temperature sensor replacement is typically the least expensive fix, often ranging from around $100 to $250 including parts and labor. A control board replacement involving a stuck relay can range from $300 to $600 or more depending on the specific model and part availability. A service call for diagnosis alone generally runs between $75 and $150 before any parts are factored in.

Some parts of the diagnosis, such as checking the calibration offset setting or resetting the control, can be done without special tools. However, fully diagnosing this fault requires a calibrated thermocouple to verify actual cavity temperatures, plus knowledge of how to interpret cycling charts and resistance values. If the issue involves a faulty sensor, control board relay, or software calibration mismatch, a qualified technician should handle the repair.

Resetting the control by cycling power may temporarily clear the code, but it will return if the underlying cause is not corrected. The fault is triggered by a sustained over-temperature condition, so simply resetting the unit without diagnosing the root cause means the oven is likely to fault again during the next cooking cycle. A proper repair requires verifying sensor accuracy, calibration values, and element cycling behavior.