Dacor Oven Error Code U30

U30 indicates that the upper or single oven temperature sensor probe 1 has an open circuit. The oven's control system detected an out-of-range A/D value of 0X3F0 or higher for at least 60 continuous seconds, which signals that the sensor circuit is broken or disconnected. The oven cannot regulate temperature safely while this fault is active.

No, it is not safe to operate the oven with an active U30 fault. Without a functioning temperature sensor, the control board cannot monitor or regulate oven temperature, which creates a risk of overheating. The oven should remain off until the sensor circuit is repaired.

Repair costs depend on which component has failed. A replacement temperature probe typically ranges from $30 to $80 for the part. A wiring harness can range from $20 to $60 depending on the specific model. If professional labor is involved, expect to add $100 to $200 or more for the service call and diagnostic time. Relay board replacement, if required, is significantly more expensive.

Resetting the oven by cutting power at the breaker may temporarily clear the display, but the fault will return as soon as the control re-reads the sensor and detects the open circuit condition again. A lasting fix requires repairing or replacing the defective component, whether that is the probe, the harness, or a connector.

Start by inspecting the wiring connectors at the relay board and at the temperature probe itself, reseating any that are loose. If connections are secure, test the probe with a multimeter for continuity and correct resistance. A probe showing infinite resistance has failed and needs to be replaced. If the probe tests fine, inspect the wiring harness for damage and replace it if a broken wire is found.