Wolf M Series Code 0421: upper left convection relay shorted

What 0421 means

With 0421, a Wolf M Series wall oven (SO30, DO30 or the later SO3050 types) reports that the upper left convection element relay reads shorted. The code 0422 names the lower left one. The third digit stands for priority. Convection cooking may stop and the display keeps the code.

Common causes of 0421

Upper left convection element relay stuck closed
Control board relay output failing
Convection element wiring damaged

✓ One safe check you can try

1. Turn the oven off and let it cool fully. 2. Switch the breaker off for a minute and on again. 3. Run one convection cycle and watch the display. 4. If 0421 returns, leave the oven off. 5. Call us and give the model number.

! Why to stop there

A shorted relay can keep an element energized.
Testing it needs access to the control side of the oven.
Written price first, and 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 0630Wolf M Series Oven Code 0630: Auxiliary DLB Shorted 1D21Wolf M Series Code 1D21: Both upper broil element DLbs open 3721Wolf M Series Code 3721: Upper door lock switch position invalid 2030Wolf M Series Code 2030: Relay board ambient thermistor circuit 3821Wolf M Series Code 3821: Upper bake bank wiring error

04210421 questions

What does 0421 refer to?

The upper left convection element relay reading shorted. Booking is easy by phone or online, and we confirm the time by message. Our aim is to fix it right the first time and leave the kitchen tidy.

How does it differ from 0422?

0422 is the lower left convection element relay with the same condition. We test every function we touched before we call the job done. Where we can, we offer the repair at the same visit once you approve the price.

Is 0421 the same as 0121?

No. 0121 is the upper right convection relay. The number tells us which element. Report anything unusual such as smells or noises when you call, so we prepare properly.