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 AF04: Communication Error With Power Board
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 AF04 signals a critical communication breakdown between the control board and the power board. This issue typically stems from faulty interconnecting cables or a malfunctioning control or power board itself. Immediate action involves checking all wiring and component connections.
Technical Details
Repair Steps:
- Perform Initial Assessment and Power Cycle: Observe if the oven attempts to restart or if the AF04 alarm reappears immediately after a power cycle. This helps confirm the persistence of the fault.
- Inspect and Disconnect External Connections: Carefully examine the P10, P11, and P12 sockets on the control board. If any external accessories or additional plugs are connected to these ports, disconnect them temporarily to rule out interference or accessory-related faults.
- Test Continuity of Main Communication Cable (P09): With the oven powered off and safely isolated, disconnect the communication cable connected to the P09 socket. Use a multimeter set to ohm mode to measure the electrical continuity (pin-to-pin) of this cable. Verify that there is proper conductivity and no open circuits.
- Test Continuity of Accessory Cables (P10, P11, P12): If the issue persists after checking P09 and disconnecting accessories, test the electrical continuity (pin-to-pin) of any cables that were previously connected to the P10, P11, or P12 sockets. Check for both open circuits and short circuits. Replace any cable found to be faulty.
- Replace Communication Cable: If continuity tests on the P09 cable reveal a fault (open circuit or short), replace the entire control/power board communication cable. Restore connections and test the oven’s operation.
- Replace Control Board: If the AF04 alarm persists after verifying and replacing all relevant cables, the control board is the next component to suspect. Before installation, carefully recover the SD card from the old control board and insert it into the new one. After replacement, perform a forced software upgrading procedure as per UNOX service documentation.
- Replace Power Board: If replacing the control board does not resolve the problem, reinstall the original control board (if functional) and proceed to replace the power board.
- Consider Accessory Board Replacement: If the error is still unresolved and was linked to a specific accessory connected to P10, P11, or P12, consider replacing the circuit board of that connected accessory.
Common Questions:
Q: What does error code AF04 signify on a UNOX BAKERLUX SHOP.Pro oven?
A: Error code AF04 indicates a communication error between the main control board and the power board, which is crucial for the oven’s operational functions.
Q: What are the primary troubleshooting steps for an AF04 error?
A: Start by inspecting and testing the continuity of the main communication cable (P09) and any cables connected to accessory ports (P10, P11, P12). Disconnecting accessories can also help isolate the issue.
Q: Which components are most commonly involved when troubleshooting an AF04 error?
A: The main components typically involved are the control board, the power board, the communication cable connecting them, and potentially the circuit boards of any connected accessories.
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.