Wolf Oven Error Code 1620

Error code 1620 on a Wolf oven indicates that the auxiliary Dual Line Break (DLB) circuit on the relay board is reading as open. A DLB relay system is a safety architecture that interrupts both legs of the 240V supply to the heating elements, ensuring full disconnection when the oven is not actively calling for heat. The "auxiliary" DLB refers to a secondary relay within this safety circuit, separate from the primary switching relay, that provides a redundant break in the power path. When the control detects that this auxiliary relay contact is open when it should be closed, or is failing to complete the circuit as commanded, error 1620 is triggered.

The relay board in a Wolf oven houses multiple relays responsible for controlling bake and broil elements, convection, and the DLB safety contacts. An open condition on the auxiliary DLB relay can result from a failed relay coil, a burned or pitted relay contact that no longer makes continuity, a solder joint failure on the relay board itself, or internal board trace damage. Because the control monitors this relay's state, even an intermittent loss of contact will generate the fault code.

The primary diagnostic path for error 1620 is replacement of the relay board, since the fault is localized to a component on that board and individual relay replacement at the component level is generally not a supported repair path for this assembly. Before replacing the board, a technician should inspect wiring harness connectors at the relay board for any signs of heat damage, corrosion, or loose pins, as a poor connection to the board could simulate an open relay condition.