Error Code
high
Unox BAKERLUX SHOP.Pro – Contactors are Chattering
On your BAKERLUX SHOP.Pro unit, chattering contactors typically indicate an unstable power…
Unox BAKERLUX SHOP.Pro - Error AL02/A09: Prover Communication Error
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 AL02/A09 indicates a critical lack of communication between the oven power board and the prover power board. This prevents the prover from operating correctly and performing its essential proofing function. Begin troubleshooting by checking and reseating the communication cable to different available sockets on both boards.
Technical Details
Repair Steps:
- Inspect and Reseat Communication Cable: Locate the communication cable connecting the oven power board and the prover power board. Disconnect it and reconnect it to a different available socket on both boards. Specifically, try P9, P10, P11, or P12 on the oven power board and P5 or P6 on the prover power board. Power cycle the unit and check if the alarm persists.
- Replace Communication Cable: If the AL02/A09 alarm continues after trying different sockets, the communication cable itself may be faulty. Replace the connection cable with a new, known-good cable. Power cycle the unit and re-evaluate the alarm status.
- Replace Prover Power Board: Should the alarm persist after replacing the cable, the next most likely component at fault is the prover’s control electronics. Replace the prover power board with a new one. Test the unit to see if the communication is restored.
- Replace Oven Power Board (If Necessary): If replacing the prover power board does not resolve the issue, reinstall the original prover power board. The root cause may then be with the main control system. Proceed to replace the oven power board. This is the final step in diagnosing the communication path between these two critical components.
Common Questions:
Q: What does AL02/A09 specifically indicate on my UNOX BAKERLUX SHOP.Pro?
A: AL02/A09 signifies a critical communication breakdown between the main oven’s power board and the dedicated power board for the prover base. This prevents the prover from receiving commands or status updates, rendering it inoperable for proofing cycles.
Q: Where are the specific connection points (P9-P12, P5-P6) located for this cable?
A: These connection points are located directly on the respective power boards. P9, P10, P11, P12 are typically found on the oven’s main power board, while P5 and P6 are on the prover’s power board. Always refer to your unit’s wiring diagram or service manual for precise locations.
Q: Is it safe to operate the oven if the prover communication error (AL02/A09) is active?
A: While the oven heating elements might still function, the prover will not operate correctly, if at all. This means you cannot perform integrated proofing and baking cycles. Continued operation with this error is not recommended as it indicates a core system communication fault, potentially impacting other functionalities or leading to further issues.
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.