Wolf M Series Code 1620: Auxiliary DLB open

What 1620 means

On Wolf M Series wall ovens, 1620 reports that the auxiliary DLB circuit is open. It is not tied to just the upper or lower cavity, so the code has no 1 or 2 ending. The same code is documented for the newer E Series. Owners see 1620 on the display and heating may be restricted. The DLB is an electrical path the control checks before heating, so a break shows up as a code first.

Common causes of 1620

The auxiliary DLB circuit is open on the relay board
A loose or damaged connector in the DLB wiring
A heating element opening the DLB path

✓ One safe check you can try

1. Cancel cooking, wait for the cavity to cool, and close the door. 2. Confirm the breaker is on, then reset it for a minute. 3. Start a brief test cycle and watch the display. 4. A returning code needs a technician to test the circuit.

! Why to stop there

The circuit is energized with line voltage, which makes home repairs unsafe.
On this code the cause may also be a loose or damaged connector in the DLB wiring, or a heating element opening the DLB path, so we rule each out before we quote.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Wall Oven codes

0121Wolf M Series Oven Code 0121: upper right convection relay shorted 0221Wolf M Series Code 0221: Upper Bake Element DLB Shorted 0321Wolf M Series Oven Code 0321: Broil Relay Shorted on the Upper Element 0421Wolf M Series Code 0421: upper left convection relay shorted 0630Wolf M Series Oven Code 0630: Auxiliary DLB Shorted 2420Wolf M Series Code 2420: Relay board RTD circuit 3C20Wolf M Series Code 3C20: High input voltage 2631Wolf M Series Code 2631: Relay board door switch circuit

16201620 questions

Which oven does 1620 refer to?

Code 1620 is not specific to one cavity because it names the auxiliary DLB circuit. In a double oven both cavities can be affected, so note what each one does and tell us. We trace the circuit and quote before any work.

Will the oven overheat with a DLB code?

No. An open circuit means power is not reaching the element, which fails safe. The risk is poor cooking, not heat. We still want the cause found before it spreads to a neighboring circuit.

Do you guarantee the repair?

Yes. Our work carries a 30-day workmanship warranty, and the written price you approve covers the testing and the repair. We never start without your sign-off.