Error Code
high
Unox ZERO range – Error WF33/AF40: Corrupted SD Card
On your CHEFTOP MIND.Maps™ ZERO unit, error WF33/AF40 signals a corrupted SD…
Unox ZERO range - Error AF03: Temperature Probe Damage Alarm
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 MIND.Maps™ ZERO unit, error code AF03 indicates an issue with the oven's temperature probe or the main power board. This alarm requires immediate attention as it impacts temperature regulation and oven operation. Begin by inspecting the temperature probe's connection and resistance, then replace the probe or the power board if the issue persists.
Technical Details
Repair Steps:
- Safety First: Turn off the power supply to the oven at the main breaker and allow the unit to cool down completely before proceeding. This is critical for safety.
- Access Internal Components: Carefully open the back panel of the oven to gain access to the internal components, including the main control board and the temperature probe.
- Locate and Check Probe Connection: Identify the oven’s internal temperature probe. Visually inspect its connection to socket P14 on the main power board. Ensure the connector is securely seated and free from any signs of corrosion or damage.
- Test Temperature Probe Resistance: Disconnect the temperature probe from the P14 socket. Set a multimeter to ohms (Ω) and measure the resistance across the probe’s terminals. At an ambient temperature of 25°C (77°F), the expected resistance value should be approximately 110Ω. Note that resistance values will vary with temperature; a colder probe will read lower, a warmer probe higher.
- Evaluate Probe Condition: If the measured resistance value deviates significantly from the expected 110Ω at 25°C, or if it reads open circuit (infinity) or short circuit (near zero), the temperature probe is faulty. Replace it with a genuine UNOX replacement part.
- Reconnect and Retest Oven: If the probe tested correctly, or after replacing a faulty probe, securely reconnect it to P14. Close the back panel, restore power to the oven, and test its operation to check if the AF03 alarm has cleared.
- Evaluate Power Board: If the temperature probe measured within the correct resistance range but the AF03 alarm persists after proper reconnection and retesting, the issue likely lies with the power board. In this scenario, the power board should be replaced by a qualified technician to resolve the error.
Common Questions:
Q: What does error code AF03 mean on my UNOX CHEFTOP MIND.Maps™ ZERO oven?
A: Error code AF03 on a UNOX CHEFTOP MIND.Maps™ ZERO unit indicates a malfunction with the oven’s internal temperature probe or, less commonly, an issue with the main power board. This directly affects temperature regulation and oven safety.
Q: Can I continue to operate my UNOX oven if the AF03 error is present?
A: No, it is strongly advised not to use the oven when the AF03 error is active. A faulty temperature probe can lead to inaccurate temperature control, potential overheating, undercooking, or other safety hazards. Continued operation could also damage the unit.
Q: Why is the power board mentioned as a possible cause for AF03 if it’s a temperature probe error?
A: While AF03 primarily points to the temperature probe, the power board is responsible for reading and interpreting the probe’s signal. If the probe itself is functional but the board cannot correctly process its input, the error will persist, making the power board the underlying issue.
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.