Dacor Range Oven Cooktop Error Code L43

Error code L43 on a Dacor range or oven indicates a fault associated with the relay board designated for the lower oven, specifically involving the S19 relay circuit. The relay board is responsible for switching power to various heating elements and oven functions based on commands from the main control board. When the control system detects an anomaly at the S19 relay position, either through a failed continuity check, unexpected voltage signal, or an open/shorted relay contact, it triggers the L43 code to alert the technician that this circuit is not functioning within expected parameters.

The two primary causes identified for L43 are a bad connection at the S19 relay on the board, or a failed relay board itself. A bad connection typically means the relay's solder joints have cracked or the board's connector pins have corroded, loosened, or pulled away from their contacts. This kind of connection fault can cause intermittent or complete loss of the switching function for that relay. A failed relay board means the S19 relay component itself has burned out, seized in an open or closed position, or the surrounding circuitry on the board has degraded to the point where it can no longer reliably operate.

Because the relay board governs power distribution to the lower oven's heating elements, a fault here directly affects lower oven operation. The lower oven may fail to heat, heat inconsistently, or not respond to control inputs at all. Diagnosing L43 requires inspecting the relay board for visible damage such as burn marks or corrosion, checking all connector seating at the board, and ultimately testing or replacing the relay board if the connection inspection does not resolve the fault.