ERROR CODE EXPLAINED
Wolf M Series Wall Oven
Wolf M Series Wall Oven 0421 Error Code
What it means
Wolf identifies M Series wall-oven fault 0421 as a shorted upper-left convection-element relay.
Try this first
- Turn the home circuit breaker to the oven off for 10 seconds, then reset it.
- Retest oven operation.
- If the issue remains, contact Factory Certified Service to schedule a repair appointment.
Can I keep using it?⚠ Wolf identifies M Series wall-oven fault 0421 as a shorted upper-left convection-element relay.
Repair usually required?⚠ Follow only the manufacturer-backed checks listed below before further repair diagnosis.
If the error keeps returning
Use the linked official Sub-Zero, Wolf, and Cove support article and contact Factory Certified Service if the issue remains.
Official source
Troubleshooting information verified against manufacturer support documentation.
View manufacturer support page →Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.