Error Code
high
Unox OVEN – Control Panel or USB Board Defective – Buzzer Does Not Sound
On your CHEFTOP and BAKERTOP MIND.Maps™ unit, a non-sounding buzzer often indicates…
Unox OVEN - Error AF43: Single-point or multi-point core probe completely damaged
Critical / Stop Operation
Warning: The information provided here is for educational purposes only.
Working with commercial kitchen equipment involves high voltage, gas, and high temperatures.
We strongly recommend contacting a certified service technician for any repairs.
We are not responsible for any damage or injuries resulting from DIY repair attempts.
This information is provided 'as is' without any guarantees of completeness or accuracy.
TLDR
On your UNOX CHEFTOP and BAKERTOP MIND.Maps™ unit, error code AF43 indicates a completely damaged single-point or multi-point core probe. This critical component failure prevents accurate internal food temperature monitoring, halting cooking processes that rely on it. You must inspect and likely replace the core probe and its associated wiring.
Technical Details
Repair Steps:
- Safety First: Disconnect the oven from its electrical power supply to prevent electric shock hazards before performing any inspections or repairs.
- Visual Inspection of the Core Probe: Carefully examine the entire length of the core probe, including the handle, cable, and the metal tip, for any signs of physical damage such as bends, cuts, nicks, cracks, melting, or exposed wiring. Pay close attention to the area where the cable exits the probe handle.
- Inspect the Probe Cable and Connector: Trace the core probe cable from the probe itself to its connection point on the oven (either an external jack or an internal connection on the main control board). Look for any signs of crimping, fraying, burning, or rodent damage along the cable path. Ensure the connector is clean, free of corrosion, and securely seated in its port.
- Test Probe Resistance (Advanced): If you have access to a multimeter and the UNOX service manual for expected resistance values (typically a PT100, PT1000, or NTC thermistor), you can test the probe’s resistance. An open circuit (OL reading) or a short circuit (near 0 ohms) will confirm the probe is internally damaged. Consult the manual for specific pinouts and temperature-resistance charts.
- Core Probe Replacement: If the visual inspection or resistance test confirms damage, the core probe must be replaced. Source a genuine UNOX single-point or multi-point core probe that is compatible with your CHEFTOP or BAKERTOP MIND.Maps™ model.
- Reassembly and Testing: Once the new probe is installed and securely connected, restore power to the oven. Initiate a cooking program that utilizes the core probe to verify that the error code AF43 no longer appears and that temperature readings are accurate.
- Persistent Error: If the error persists after replacing the core probe, the issue might extend to the wiring harness connecting the probe port to the main control PCB, or the core probe input circuit on the main control PCB itself. At this stage, it is advisable to contact a certified UNOX service technician.
Common Questions:
Q: What is the function of the core probe in my UNOX oven?
A: The core probe is a critical temperature sensor designed to be inserted directly into food items. It accurately measures the internal temperature of the food, allowing the oven’s control system to cook to a precise internal doneness, ensuring both quality and food safety.
Q: Can I continue cooking without a working core probe?
A: While some cooking modes that don’t rely on the core probe (like time-based cooking without internal temperature monitoring) might still function, any program requiring precise core temperature control will be disabled or will not operate correctly. Operating with a damaged core probe is not recommended as it compromises cooking accuracy and food safety.
Q: Is core probe damage typically covered under warranty?
A: Core probe damage is often due to physical impact, misuse, or wear and tear, and may not be covered under standard manufacturer warranties. Review your specific UNOX warranty terms, and be prepared for potential replacement costs if the damage is deemed external or operational.
When to call a technician
For this error, we recommend calling a certified technician. Do not continue operation or attempt repair yourself.
- Equipment shows a critical or stop-operation fault.
- You smell gas, burning, or see smoke or sparks.
- Error returns after following the steps above.
- You are not trained to work on this equipment.
- Warranty or safety could be affected by DIY repair.