Atosa Prep Table Error Code OF / on: Keyboard Lock
OF and on are keyboard lock messages on an Atosa prep table with the digital controller: OF means the keyboard is locked and on means it is unlocked. The table is working normally. To lock or unlock, hold the two lower keys for 3 seconds.
Low: an operator status message; the table keeps cooling normally.
- Code
- OF / on
- Maker
- Atosa
- Equipment
- Prep tables
- Applies to
- Atosa prep table digital controller
What does Atosa error code OF / on mean?
Messages OF / on are not alarms. The digital controller has a keyboard lock that stops accidental changes to the set point or settings during a busy shift. When you lock it, the display shows OF. When you unlock it, the display shows on. In either state the table keeps cooling as normal. People usually meet OF because the lock was set by accident, often by someone leaning on the keys while cleaning. The manual's list reflects this: a keyboard locked by accident, a button held down during cleaning, settings that cannot change while locked, and a worn keypad that locks or beeps on its own. The last item is the only one that suggests a failing part. To lock, hold the two lower keys for 3 seconds. To unlock, hold the same two keys for 3 seconds until on shows. Then make your change and lock again if you wish. If a key does not respond, do not force it.
Affected models and control systems
This applies to Atosa MSF and MPF refrigerated prep tables with the digital controller, such as the MSF8302GR, MSF8307GR and MPF8202GR. Other controller generations use different codes.
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
- OF appears when a key is pressed
- The set point will not change
- on flashes briefly after the keys are held
- The keypad seems dead after cleaning
Possible causes
Listed in Atosa's documentation
- Keyboard locked by accident
- A button held down during cleaning
- Settings locked so they cannot change
- A worn keypad that locks or beeps on its own
Other likely causes — what usually sits behind error code OF / on on this control. A technician confirms which one it is before any part is replaced.
- A wet cloth that held the two lower keys while the surface was wiped
- A new employee who held the keys while trying to read the set point
- A membrane keypad worn so the two lower keys register by themselves
Safe checks before calling for service
- To lock, hold the two lower keys for 3 seconds.
- To unlock, hold the same two keys for 3 seconds until on shows.
- Make your change, then lock again if you wish.
- If a key does not respond, do not force it.
- If the lock keeps setting itself, tell us which key and when.
How a technician diagnoses error code OF / on
- Confirm the lock state shown and the unlock sequence works.
- Test each key for response and for sticking.
- Check the keypad membrane for wear or liquid damage.
- Check the ribbon connection to the control.
- Verify the settings did not change while locked.
- Replace the keypad or control only if the keys misbehave.
- A worn keypad is a replacement part and not a cleaning job.
- Forcing keys can break the membrane.
- Settings changed by accident have to be checked against the original values.
Technical reference
- Document
- Atosa Instruction Manual (Salad prep table / Pizza prep table / Undercounter / Work top / Chef base), section 9 Alarm signalling
- Models / control
- Atosa prep table digital controller
- Section
- 9. Alarm signalling, printed p. 21 (PDF p. 22; table is an image)
- 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 Atosa prep table error codes
Is OF an error?
No. It means the keyboard is locked, and the table is working normally.
Why did it lock by itself?
Usually the lower keys were held during cleaning. A worn keypad can do it too.
How do I unlock it?
Hold the two lower keys for 3 seconds until on shows.
Need help with Atosa error code OF / on?
A technician confirms the cause on site and gives you the price in writing before any work starts.