True Refrigerator Display Loc / PoF / Pon: Keypad Lock
Loc, PoF and Pon are keypad lock messages on True cabinets with LAE or Dixell controls. The cabinet is working normally, but the buttons will not change settings until the lock is released. If the keys do not respond, do not force them and call us.
Low: a keypad lock; the cabinet keeps cooling.
- Code
- Loc / PoF / Pon
- Maker
- True
- Equipment
- Reach-in refrigerators
- Applies to
- LAE and Dixell
What does True error code Loc / PoF / Pon mean?
Loc means the keypad is locked on an LAE control. On a Dixell control, PoF means the control is locked and Pon means it is unlocked. The lock is a protection against accidental changes to set point and alarm limits, so the cabinet runs normally while the keys do nothing. These messages often appear after someone leans on the keypad, a button is held down during cleaning, or someone tries to adjust the set point. Some controls lock themselves after a time. The message tells you which state the control is in, so watch which one appears after you try to release it. The way to release it, per the manual, is to hold the up and down arrow keys together until PoF or Pon shows on the display.
Affected models and control systems
True cabinets with LAE or Dixell controls. Loc is the LAE message; PoF and Pon are the Dixell messages.
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
- Loc, PoF or Pon on the display
- Keys that do not change the set point
- Cabinet running normally
- A message flashing briefly after pressing keys
Possible causes
Listed in True's documentation
- Keypad locked by accident
- A button held down during cleaning
- Settings changes needed that the lock is blocking
- A control that locks itself after a time
Other likely causes — what usually sits behind error code Loc / PoF / Pon on this control. A technician confirms which one it is before any part is replaced.
- A cleaning cloth pressing two keys while the cabinet was wiped
- A staff member trying a set point change without knowing the lock was active
Safe checks before calling for service
- Hold the up and down arrow keys together until PoF or Pon shows on the display.
- Watch which message appears so you know whether the control is now locked or unlocked.
- Try the setting change again.
- Do not force the keys; call us if they do not respond.
- Tell us which message you saw.
How a technician diagnoses error code Loc / PoF / Pon
- Identify the control brand and message.
- Release or set the keypad lock using the control's key sequence.
- Verify the setting that needed changing and enter it.
- Test each key for response.
- Inspect the keypad membrane for damage or moisture.
- Replace the keypad or board only if keys fail.
- The set point and alarm limits that the lock protects are service settings.
- A sticking or wet keypad needs the control opened beside live wiring.
- Changing settings without the cabinet's data can cause nuisance alarms.
Technical reference
- Document
- Commercial Refrigeration General Control Guide TEC_TM_001 Rev C, LAE p.110 Display Code Definitions
- Edition
- TEC_TM_001 | REV. C | EN, 09/3/2025, P#811072
- Models / control
- LAE and Dixell
- Section
- Electronic Control (with Display) - Display Code Definitions: Carel p. 74, Danfoss ERC/ETC p. 87, Dixell p. 96, LAE p. 110
- 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 True reach-in refrigerator error codes
Is Loc an error?
No. It says the keypad is locked, and the cabinet is running normally.
What is the difference between PoF and Pon?
On Dixell, PoF means locked and Pon means unlocked.
The keys still do nothing after unlocking. What now?
Do not force them. The keypad may be damaged or wet, and we can check it.
Need help with True error code Loc / PoF / Pon?
A technician confirms the cause on site and gives you the price in writing before any work starts.