Unox BAKERLUX SHOP.Pro - Error AF02: Safety Thermostat 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 BAKERLUX SHOP.Pro unit, error code AF02 indicates a safety thermostat alarm, triggered by an oven over-temperature exceeding 320°C (608°F). This critical safety measure stops operation. Allow the oven to cool down, then reset the thermostat and investigate potential causes like installation, external heat, or component failure.

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Technical Details

Repair Steps:

  1. Initial Actions: Immediately turn off the oven and allow it to cool completely. The safety thermostat triggers at 320 °C (608 °F), requiring a full cooldown before any reset attempt.
  2. Reset the Safety Thermostat: Once the oven is cool, locate and manually reset the safety thermostat. Consult your oven’s technical diagrams for its precise location, typically on the back or side panel.
  3. Analyze Possible Causes: Investigate factors that could lead to over-temperature. Check the oven’s installation for proper ventilation, ensure no external heating sources are affecting the chamber, and inspect for obvious physical damage to components like the chamber probe. Also, check for potentially blocked contactors.
  4. Electrical Continuity Test (Thermostat Circuit): Turn on the power supply to the oven. Disconnect the P6 socket of the main contactor. Using a multimeter set to ohms, test for electrical continuity between pin 4 and pin 5 on the power board, which correspond to the TSA and TSR labels. If there is NO continuity, proceed to test the thermostat directly.
  5. Safety Thermostat Continuity Test: With the power off, isolate the safety thermostat itself and measure its electrical continuity. If there is NO continuity, the safety thermostat is faulty and must be replaced.
  6. Cable Harness Continuity Test: If the safety thermostat has continuity but the circuit test (step 4) failed, test the electrical continuity of the relevant section of the cable harness leading to the safety thermostat. If there is NO continuity, replace the faulty cable harness.
  7. Restore and Re-test: After replacing any faulty components (thermostat or cable harness), restore all connections and re-test the oven’s operation. If the AF02 alarm persists after these steps, proceed to the final step.
  8. Power Board Replacement: If all previous checks and component replacements do not resolve the AF02 alarm, the issue likely lies with a damaged power board. Replace the power board.

Common Questions:

Q: What does error code AF02 signify on a UNOX BAKERLUX SHOP.Pro oven?

A: Error code AF02 indicates that the oven’s safety thermostat has tripped due to an internal temperature exceeding 320°C (608°F). This is a critical safety measure to prevent overheating and potential damage, causing the oven to stop operation.

Q: What are the common reasons for the safety thermostat to trigger this alarm?

A: Common causes include improper oven installation leading to poor ventilation, external heat sources affecting the oven chamber, a defective chamber temperature probe, blocked contactors that continuously supply power, or a damaged power board failing to regulate heating correctly.

Q: Can I reset the AF02 alarm on my UNOX oven myself?

A: Yes, after ensuring the oven has completely cooled down, you can manually reset the safety thermostat. However, it is crucial to investigate and address the root cause of the over-temperature to prevent recurrence and ensure safe operation. Professional diagnosis is recommended if the alarm persists.

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.

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