Dacor Range, Oven, Cooktop Error Code L20

The L20 code indicates that the lower oven has detected a cook temperature exceeding 610°F sustained for two or more minutes. This is a protective over-temperature fault that shuts down oven operation to prevent damage or a fire hazard. The most likely causes are a faulty temperature sensor, a stuck relay on the control board, or a shorted heating element.

No. The L20 fault indicates a condition where oven temperature reached a potentially dangerous level, and the oven should not be used until the underlying cause is identified and corrected. Continuing to operate the oven with a stuck relay or shorted element could create a fire risk.

Repair costs vary depending on the failed component. A replacement oven temperature sensor typically runs in the range of $20 to $80 for the part, while a control board can cost anywhere from $150 to $400 or more depending on the model. Adding professional labor charges, total repair costs generally range from $100 to $500 or higher for more complex board or wiring repairs.

Some steps, such as inspecting wiring connections or visually checking heating elements, are manageable for a knowledgeable DIYer. Replacing the oven temperature sensor is also a relatively straightforward repair once the correct part is confirmed. However, diagnosing a stuck relay or replacing a control board involves working near high-voltage components and may be better handled by a qualified technician.

Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the fault code and restore operation. However, if the root cause, such as a defective sensor or stuck relay, has not been addressed, the L20 code will return, often quickly. A reset alone is not a repair.