Wolf Legacy E Series Code Lock Inputs Invalid: door lock signals, 04 x 0

What Lock inputs invalid means

On Wolf Legacy E Series wall ovens from the SO30TE/PE generation, including the SO30TE/S/TH, code 04 x 0 reads Lock inputs invalid. The control board is receiving a combination of signals from the door lock mechanism that makes no sense, so it cannot tell whether the door is locked. The oven may stop or refuse to run cycles that depend on the lock.

Common causes of Lock inputs invalid

Door lock inputs reporting an impossible combination
Door latch mechanism not in a clear state
Wiring between lock and board

✓ One safe check you can try

1. Switch the oven off and let it cool. 2. Open and close the door fully, listening for the latch to move. 3. Check for anything stuck in the door frame. 4. Restore power and try a normal bake. If 04 x 0 returns, stop and book a visit.

! Why to stop there

Lock signals and motor behavior have to be checked with the oven powered and the panels off.
Forcing a stuck latch can damage the mechanism.
Written price first, then work with a 30-day workmanship warranty.

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 2A30Wolf M Series Code 2A30: Microprocessor communication failure 1231Wolf M Series Code 1231: Upper bake element DLB open 2C20Wolf M Series Code 2C20: Relay board network failure

Lock inputs invalidLock inputs invalid questions

How is 04 x 0 different from 04 x 1?

04 x 0 is general: the lock inputs are invalid. 04 x 1 specifically says the lock and door inputs are invalid for a cleaning cycle. Both involve the latch and door signals reaching the board.

Is this a door problem or a board problem?

It could be either the lock mechanism, its wiring or the board reading it. That is why we test before recommending a part. We do not guess at control boards.

Should I keep trying cycles?

Try once after a cool-down. Repeated attempts can strain a latch that is already out of step. If the code comes back, book service. That keeps a small latch problem from turning into a broken mechanism.