Wolf M Series Code 1D21: Both upper broil element DLbs open

What 1D21 means

Wolf M Series wall ovens show 1D21 when both DLB circuits for the upper oven's broil elements are read as open at once. The control cannot complete a path to either broil element. The code appears on the display and the upper oven will not broil, though other cooking modes may work. Heating may drop out partway through a cycle, which is easy to mistake for a thermostat problem.

Common causes of 1D21

Both upper broil element DLB circuits are open
A shared connector or wire feeding both broil elements
The relay board output for the broil circuit

✓ 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

An open DLB circuit can come from the board, a connector, or the element, and only testing separates them.
On this code the cause may also be a shared connector or wire feeding both broil elements, or the relay board output for the broil circuit, 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

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 0121Wolf M Series Oven Code 0121: upper right convection relay shorted 2C20Wolf M Series Code 2C20: Relay board network failure 1231Wolf M Series Code 1231: Upper bake element DLB open 3031Wolf M Series Code 3031: Upper temperature probe shorted

1D211D21 questions

Can I still bake while 1D21 is showing?

Often yes, because 1D21 only concerns the upper broil element DLB circuits. Broiling will not work, and we suggest avoiding it. Please do not attempt repairs yourself. We test the shared path and quote it first.

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.