Dacor Range, Oven, Cooktop Error Code L43

L43 indicates a fault detected on the lower oven relay board, specifically at the S19 relay circuit. This means the control system has found either a bad connection at the S19 relay or a failed relay board. The lower oven may not heat or may operate erratically as a result. A technician will need to inspect and likely replace the relay board to resolve the issue.

Operating the lower oven with an active L43 fault is not recommended. A failed or intermittent relay can cause unpredictable heating behavior, including no heat or, in some failure modes, a relay stuck in the closed position that prevents the oven from shutting off correctly. It is best to stop using the lower oven until the relay board issue has been diagnosed and corrected.

Repair costs for L43 depend on whether the issue is a simple wiring connection or a full relay board replacement. If only a connector needs to be reseated, a service call alone may resolve it, typically ranging from $75 to $150 for labor. If the lower oven relay board needs replacement, total costs including parts and labor generally range from $200 to $500 or more depending on the specific model and parts availability.

A knowledgeable DIYer can inspect the relay board for loose connectors and attempt to reseat all wiring connections to the board as a first step. However, if the relay board itself has failed, replacing it involves working near high-voltage components inside the oven, which carries serious safety risks. For relay board replacement, it is strongly recommended to have a qualified appliance technician perform the repair.

Resetting the oven by cutting power at the circuit breaker for several minutes may temporarily clear the L43 code, but it will return if the underlying fault at the S19 relay or relay board has not been resolved. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. Persistent reappearance of L43 confirms the relay board or its connections need physical attention.