Wolf M Series Code 3421: Upper door lock timeout

What 3421 means

On Wolf M Series wall ovens, 3421 means the upper oven's motorized door lock (MDL) timed out, with 3422 for the lower oven. The lock did not finish its movement in the time the control allowed. You see the code and the door may stay locked, stay unlocked, or block a cleaning cycle. Cleaning cycles are the usual place this shows up.

Common causes of 3421

The upper MDL did not reach position in time
A sticky or damaged lock mechanism
Wiring or the relay board output for the lock

✓ One safe check you can try

1. Press off and wait for the cavity to cool. 2. Close the door fully, then try the latch or lock again. 3. Switch the oven breaker off for one minute and back on. 4. If the code returns or the door stays locked, do not pry it. Call us.

! Why to stop there

Self-clean heat is high, so a lock that is not working is a safety matter.
On this code the cause may also be a sticky or damaged lock mechanism, or wiring or the relay board output for the lock, 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 3D20Wolf M Series Code 3D20: Input voltage frequency error 2631Wolf M Series Code 2631: Relay board door switch circuit

34213421 questions

What does a timeout mean for the door lock?

The control told the lock to move and did not see it finish in time. It may be mechanical, such as binding, or electrical. We check the latch movement and wiring and quote before replacing the lock assembly.

Can I use the oven for baking while this code shows?

Often yes if the door opens and closes normally, since the code concerns the lock circuit. Avoid self-clean cycles until it is repaired. If the door will not unlatch, stop and call us rather than forcing it.

Do you charge before diagnosing the lock?

We tell you the diagnostic price on the phone, then give a written repair price before any work. Lock and relay repairs carry our 30-day workmanship warranty, and we do not bill for parts we did not install.