Dacor Range, Oven, Cooktop Error Code L34

L34 indicates an open circuit condition in RTD 3, the resistance temperature detector for the lower oven. The control board cannot detect any resistance signal from the sensor, meaning there is a break in the circuit. This could be at the sensor itself, a wiring connector, or along the harness. The oven disables lower oven operation until the fault is resolved.

You should not operate the lower oven while L34 is present. Without a functioning temperature sensor, the control board cannot regulate heat accurately in that cavity, which creates a risk of overheating. Avoid using the lower oven until the fault is diagnosed and repaired.

Repair costs vary depending on the root cause. If only a connector needs reseating or cleaning, cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the RTD 3 sensor generally adds $50 to $150 in parts. A control board replacement is the most expensive scenario, often ranging from $200 to $500 or more in parts alone, plus labor.

Checking and reseating wiring connectors is a task many experienced DIYers can perform after disconnecting power to the appliance. Testing the RTD sensor with a multimeter is also manageable if you are comfortable with basic electrical measurements. However, replacing internal wiring harnesses or the control board typically requires disassembling the oven and is better suited to a qualified technician.

A power reset by turning off the circuit breaker for 30 to 60 seconds may temporarily clear the code, but if the underlying open circuit in the RTD 3 sensor or wiring is still present, the error will return as soon as the oven attempts to read the lower oven temperature. A reset alone is not a repair.