Southbend Commercial Oven Error Code F5: Bad Temperature Controller
F5 on a Southbend convection oven is listed as a bad temperature controller, and the manual's remedy is to replace it. Turn the oven off and on once. If F5 returns, call us to confirm the controller.
High: the controller is reported bad, and the oven cannot be relied on to regulate heat.
- Code
- F5
- 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 F5 mean?
The code F5 sits alongside F1, F6 and F8 in the list of controller failures. The manual gives the same cause for each, a bad temperature controller, and the same remedy, replace the temperature controller. The oven shows F5 when the controller is judged bad, and the manual's repair is replacement rather than adjustment. The manual does not explain what separates F5 from F1, F6 and F8, so we do not claim a difference. What the operator can tell a technician is the exact code and when it appeared, for example at power-up or after a long bake. Before a controller is ordered, a technician checks the supply and the connections, because they can cause the same code on a healthy controller.
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
- F5 appears on the control display
- The oven stops heating
- The controls may not respond
- F5 returns after a restart
Possible causes
Likely causes — what usually sits behind error code F5 on this control. A technician confirms which one it is before any part is replaced.
- Bad temperature controller
- A supply fluctuation that disturbed the controller's internal check
- A ribbon or plug between the keypad and controller that has worked loose
Safe checks before calling for service
- Turn the oven off at the switch and wait a minute.
- Turn it back on and see whether F5 returns.
- Do not press keys repeatedly or try to reprogram.
- If F5 returns, write down the model and when it appeared, and call us.
How a technician diagnoses error code F5
- Read the code and confirm it is F5 on this model.
- Check the supply and the connections to the controller.
- Power the oven off and on and watch for a repeat.
- Check the keypad connection.
- Confirm the right controller for the gas or electric model.
- Replace the temperature controller.
- The controller is behind the panel with mains voltage present.
- A wrong replacement controller can change how the oven heats, so the part number is matched to the exact model.
- A loose connection is checked with the oven powered down, and the oven is tested through a full heating cycle afterward.
How error code F5 differs from similar codes
F5 shares its cause and remedy with F1, F6 and F8. F2, F3, F4 and F7 name different conditions.
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
What is the difference between F5 and F1?
The manual lists the same cause and remedy for both and does not describe a difference.
Can I use the oven with F5?
No. The manual lists a bad controller.
Will turning it off and on clear F5?
It might for a one-time disturbance, but a repeat means the controller needs replacing.
Need help with Southbend error code F5?
A technician confirms the cause on site and gives you the price in writing before any work starts.