Dacor Oven Error Code L34

L34 means the lower oven temperature sensor (probe 3) is reading an open circuit. The oven's control has detected an analog-to-digital value of 0x3F0 or higher on that sensor input for 60 consecutive seconds, which indicates the sensor circuit is not functioning. The fault could originate at the sensor itself, the wiring harness, or the connectors at the relay board.

You should not continue using the oven while this fault is active. With the lower oven temperature sensor in an open-circuit state, the control cannot accurately monitor heat in the lower cavity. Operating the oven without a functional temperature sensor creates a risk of overheating and uncontrolled temperatures.

Repair costs depend on the root cause. Reconnecting a loose connector costs nothing beyond the diagnostic time. A replacement lower oven temperature sensor typically runs in the range of $30 to $80 for parts. If the relay board requires replacement, parts alone can range from $150 to $350 or more, with additional labor costs if a technician is needed.

A knowledgeable DIYer can perform the initial diagnostic steps, including checking and reseating connectors at the relay board and the probe connector. Testing the sensor with a multimeter for continuity and resistance is also within reach for someone comfortable working with appliances. However, if the relay board itself needs replacement, professional service is recommended to ensure correct installation.

A power reset may temporarily clear the fault display, but L34 will return if the underlying open-circuit condition is still present. Because the code requires the out-of-range A/D value to persist for 60 continuous seconds, the fault will reappear as soon as the oven attempts to use that sensor. A reset is not a repair and the root cause must be addressed.