UNOX Combi Oven Error Code AF23: Gas Rearm, No Gas Supply
AF23 on a UNOX gas combi oven reads GAS REARM and means the oven reports that no gas is being supplied, so the burner cannot re-arm. Check that the gas supply to the oven is open and then call for service. If you choose IGNORE, the manual says the oven cannot be used.
High: with no gas the burner cannot light, so a gas oven cannot be used.
- Code
- AF23
- Maker
- UNOX
- Equipment
- Combi ovens
- Applies to
- CHEFTOP-BAKERTOP MIND.Maps PLUS (gas models)
What does UNOX error code AF23 mean?
UNOX MIND.Maps PLUS ovens show alarms and warnings on a dedicated screen. On a gas model the control expects gas to be available whenever the burner is asked to light. When the oven reports that no gas is being supplied, the burner cannot re-arm, and the control raises the warning AF23. The screen reads "AF23 - GAS REARM" and sits on a WARNINGS panel that also prints the UNOX SERVICE phone number, with an IGNORE button and an OTHER N button. IGNORE brings up a warning screen, and the manual states that an ignored alarm leaves the oven unusable. The manual gives a single listed cause for this alarm, which is the absence of gas supply, and a single action, which is to contact UNOX support using the number shown.
Affected models and control systems
The manual is for the CHEFTOP and BAKERTOP MIND.Maps PLUS ovens. AF23 applies to the gas models only, since an electric oven has no burner to re-arm.
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
- AF23 - GAS REARM on the warnings screen
- Burner not lighting and the oven not heating
- Oven unusable after IGNORE is pressed
Possible causes
Listed in UNOX's documentation
- No gas supply
Other likely causes — what usually sits behind error code AF23 on this control. A technician confirms which one it is before any part is replaced.
- Building gas shutoff or the oven's own shutoff valve closed after cleaning or a gas company visit
- Flexible gas connector kinked or pushed against the wall when the oven was moved
- Gas interruption on the line that came back after the oven had already raised the alarm
Safe checks before calling for service
- Look at the gas shutoff valve on the supply line to the oven and confirm the handle is in line with the pipe, which is the open position.
- If you smell gas at any point, leave the area, keep flames and switches alone, and call the gas utility first.
- Do not keep pressing IGNORE to try to cook, because the manual says the oven cannot be used with the alarm ignored.
- For the service call, note the exact text shown, which model size the oven is, and whether other gas appliances were running.
How a technician diagnoses error code AF23
- Read the alarm text and confirm AF23 on a gas model, and check the oven's rating label for gas type and pressure.
- Verify gas is present at the supply, with the line open and the gas utility supplying it, using a manometer at the appliance connection.
- Inspect the flexible connector, regulator and any filter or shutoff in the supply line for restriction.
- Test the burner's gas valve and control response only after supply is proven, following UNOX's service procedure.
- Run a heat-up cycle to confirm the alarm no longer appears.
- Gas piping and connectors carry a leak risk, and only a licensed technician should open, test or adjust them.
- Measuring supply pressure at the appliance requires a manometer and knowledge of the correct pressure for the gas type.
How error code AF23 differs from similar codes
AF23 is a gas-specific alarm. An electric MIND.Maps oven would not show a gas rearm warning.
Technical reference
- Document
- CHEFTOP / BAKERTOP MIND.Maps PLUS USE & MAINTENANCE (Translation of the original instructions)
- Edition
- LI2450B0 D00-LDI-01 (WEB)
- Models / control
- CHEFTOP-BAKERTOP MIND.Maps PLUS (gas models)
- Section
- Alarms & Warnings | Oven user interface, p.76
- 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.
Can I use the oven if I press IGNORE?
The manual says that if the alarm is ignored the oven cannot be used. IGNORE only lets you see the warning screen.
Does AF23 mean the oven itself is broken?
The manual's only listed cause is no gas supply, so the oven may be working correctly and simply not receiving gas.
What is the OTHER N button?
It shows a list of additional service phone numbers, alongside the UNOX SERVICE number on the panel.
Need help with UNOX error code AF23?
A technician confirms the cause on site and gives you the price in writing before any work starts.