Southbend Commercial Oven Error Code F8: Bad Temperature Controller
F8 on a Southbend convection oven is the fourth bad temperature controller code, along with F1, F5 and F6. The manual's remedy is to replace the controller. Turn the oven off and on once, and call us if F8 returns.
High: the controller is reported bad, and the oven cannot be relied on to regulate heat.
- Code
- F8
- Maker
- Southbend
- Equipment
- Convection ovens
- Applies to
- Gas and Electric SilverStar / Marathoner Gold convection control (programmable and rack-timer models)
What does Southbend error code F8 mean?
F8 completes the group of codes F1, F5, F6 and F8, which the manual describes as a bad temperature controller. The repair is the same for each: replace the temperature controller. The manual attributes F8 to the controller itself, so the settings are not the cause. The manual does not say what separates F8 from the other three, so we do not invent a difference. The useful step for an operator is to power the oven off for a minute, because a brief disturbance can clear a one-off. The useful step for a technician is to check the power and connections first. If F8 returns on a clean restart, the controller is replaced, matching the version for gas or electric ovens.
Affected models and control systems
Southbend Marathoner Gold and SilverStar gas convection ovens, programmable and rack-timer models (GB/15PC, SLGB/15SC), and Southbend electric convection ovens EB/10PC, programmable and rack-timer models.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- F8 appears on the control display
- The oven stops heating
- The oven may restart and show F8 again
- The keypad does not respond normally
Possible causes
Likely causes — what usually sits behind error code F8 on this control. A technician confirms which one it is before any part is replaced.
- Bad temperature controller
- An electrical disturbance on the oven circuit from other kitchen equipment
- Heat or steam exposure that has aged the controller board
Safe checks before calling for service
- Turn the oven off for at least a minute, then on again.
- Check that no other equipment on the circuit tripped at the same time.
- Do not try to reprogram the controls.
- If F8 returns, write down the model and call us.
How a technician diagnoses error code F8
- Read the code and confirm it is F8.
- Check the supply and the circuit for disturbances.
- Inspect the controller connections.
- Power cycle and observe the code.
- Confirm the right controller for the model.
- Replace the temperature controller.
- Electrical disturbances need meter checks on the oven circuit.
- The controller is replaced behind the panel with mains voltage nearby.
- Gas and electric versions have different controllers, so the correct part has to be matched to the model, and the new controller is run through a heating cycle to confirm it holds temperature.
How error code F8 differs from similar codes
F8 has the same cause and remedy as F1, F5 and F6.
Technical reference
- Maker documentation
- Southbend owner support
- Edition
- Part No. 1181887, Rev. 1
- Models / control
- Gas and Electric SilverStar / Marathoner Gold convection control (programmable and rack-timer models)
- Section
- Troubleshooting, Interpreting displayed error codes (manual p. 42)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Southbend convection oven error codes
Do F5, F6 and F8 mean different things?
The manual lists the same cause and remedy for all, so we do not claim a difference.
Can the controller be repaired?
The manual's remedy is to replace it.
Can I just keep restarting?
A restart may clear a disturbance, but a repeat means the controller needs service.
Need help with Southbend error code F8?
A technician confirms the cause on site and gives you the price in writing before any work starts.