Southbend EZ Com Oven Error Code Err bu:tn: Stuck Button
Err with bu:tn on a Southbend EZ Com combination oven means a control panel button is stuck down, or a button was held during power-up. Free the button, then turn the oven off and on.
Low: the cause is a single key, and releasing it and restarting usually clears the code.
- Code
- Err + bu:tn
- Maker
- Southbend
- Equipment
- Convection ovens
- Applies to
- Southbend EZ Com control
What does Southbend error code Err + bu:tn mean?
At power-up and during operation the controller scans the keys. If a key reads as pressed continuously, because it is stuck down or because someone was holding it when the oven was switched on, the controller flags a button error. On the EZ Com oven the TEMPERATURE display shows Err and the TIME display shows bu:tn. The manual lists two causes: a stuck button and a button held during start-up. The remedy is to free the stuck button or release the held button, then turn the unit off and on. Grease, steam and the sticky residue from cleaning are all common in a combination oven kitchen, so the first thing to look at is whether a key looks sunken or tacky. A stuck key that will not free itself needs a technician, since the panel has to be opened.
Affected models and control systems
Southbend EZ Com combination ovens CG/12SC and CG/22SC.
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
- Err shows in the TEMPERATURE display and bu:tn in the TIME display
- A key on the panel feels stuck or does not spring back
- The code appears right after switching the oven on
- Keys seem unresponsive
Possible causes
Listed in Southbend's documentation
- Stuck button
- Button held during start-up
Other likely causes — what usually sits behind error code Err + bu:tn on this control. A technician confirms which one it is before any part is replaced.
- Grease or cleaning residue under a key that keeps it pressed
- A panel overlay lifted or swollen by steam so a key sits down
Safe checks before calling for service
- Look at the keys on the control panel for one that sits lower than the rest.
- Press each key once and release it to see if it springs back.
- Switch the oven off, wait a moment, and switch it on without touching the panel.
- If it persists, write down which key looks stuck and call us.
How a technician diagnoses error code Err + bu:tn
- Read the code and confirm Err and bu:tn on the displays.
- Identify which key reads as pressed.
- Check the panel overlay for swelling or damage.
- Check for grease or moisture under the keys.
- Test the keypad connection.
- Replace the keypad or overlay if a key stays stuck.
- The keypad ribbon connects to the controller behind the panel.
- Panel work needs the oven powered down.
- A damaged overlay may let steam into the controller.
How error code Err + bu:tn differs from similar codes
Bu:tn is a keypad problem, while CP:U is a controller memory problem.
Technical reference
- Maker documentation
- Southbend owner support
- Edition
- Part No. 1182851, Rev. 2
- Models / control
- Southbend EZ Com control
- Section
- Troubleshooting, Control panel error codes (manual p. 26; Gas Error flowchart p. 30)
- 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
Did I cause this by holding a key?
If a key was held at power-up, yes, and releasing it and restarting clears it.
Will cleaning fix a stuck key?
Gentle cleaning around the key may help, but do not spray liquid into the panel.
Is bu:tn serious?
It is usually a minor problem, but it blocks normal operation until cleared.
Need help with Southbend error code Err + bu:tn?
A technician confirms the cause on site and gives you the price in writing before any work starts.