Wolf M Series Code 5121: Upper cavity overtemperature in normal cooking

What 5121 means

This code is for Wolf M Series wall ovens, including the SO30TM/S/TH and DO30PM/S/PH. It reports that the upper cavity went over its allowed temperature during regular cooking rather than self-clean; the lower cavity version is 5122. The control cuts heating and displays 5121. You may notice a bake that stops early or an oven that cools down with the number showing.

Common causes of 5121

Upper cavity temperature sensor reporting inaccurately
Relay holding the heating elements on
Control not regulating the set temperature
Blocked ventilation causing excess heat

✓ One safe check you can try

1. Turn the oven off and open the door a little once it is safe to do so, letting it cool. 2. Make sure vents and cabinet gaps are clear and no foil lines the cavity floor. 3. Reset the breaker for one minute. 4. Try a low-temperature bake. If 5121 shows again, stop and call us.

! Why to stop there

Overheating protection exists for safety, so a repeat of this code should be taken seriously.
The cause could be a sensor, a relay or the control, and each needs a different fix.
We diagnose first and quote in writing before work starts.
Every repair carries our 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

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 0221Wolf M Series Code 0221: Upper Bake Element DLB Shorted 1321Wolf M Series Code 1321: Upper broil element relay open 3031Wolf M Series Code 3031: Upper temperature probe shorted 1421Wolf M Series Code 1421: Upper left convection element relay open

51215121 questions

How is 5121 different from 5021?

5021 happens during a self-clean cycle, while 5121 happens during ordinary cooking such as baking or roasting. Both mean the upper cavity got hotter than allowed.

Does a breaker reset solve it?

It can clear the display, but if the oven overheated for a real reason the code returns. A repeat means a technician should check the sensor and heat control.

What about the lower oven?

The lower cavity uses 5122 for the same condition. If your double oven shows both, tell us when you book so we plan for the right parts.