Unox OVEN - Temperature Probes Switched Or Damaged Or Power Board Defective - Does Not Cook Evenly

🛑 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 CHEFTOP and BAKERTOP MIND.Maps™ unit, uneven cooking typically indicates either incorrectly connected or damaged temperature probes, or a defective power board. First, verify the probe connections on the power board. If connections are correct, measure the resistance of the probes to identify any faults; otherwise, the power board may require replacement.

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Technical Details

Repair Steps:

  1. Verify Temperature Probe Connections: Carefully inspect the connections on the power board. The temperature probe located near the fan on the bottom side of the cooking chamber should be connected to the P19 – CMB 1 socket of the power board. The temperature probe situated near the door or ceiling of the cooking cabinet should be connected to the P16 – CMB2 socket of the power board.
    • If the temperature probes are not connected correctly, switch their connections on the power board.
  2. Measure Temperature Probe Resistance: If the temperature probes are connected correctly, use a multimeter set to ohm to measure the resistance of the probe circuit. A healthy probe circuit should typically read approximately 110 Ω at 25 °C (77 °F).
    • If the resistance reading is not 110 Ω at 25 °C (77 °F), the temperature probe is damaged and must be replaced.
  3. Replace the Power Board: If the temperature probes are connected correctly and their resistance measurements are within the specified range (approximately 110 Ω at 25 °C), then the power board is likely defective and requires replacement.

Common Questions:

Q: Why is my UNOX CHEFTOP or BAKERTOP MIND.Maps™ oven cooking unevenly?

A: Uneven cooking often points to issues with temperature sensing, such as incorrectly connected or damaged temperature probes, or a defective power board failing to accurately process the temperature signals.

Q: How do I test the temperature probes in my UNOX oven?

A: You can test the resistance of the temperature probe circuit using a multimeter set to ohms. A properly functioning probe should typically read around 110 Ω at 25 °C (77 °F).

Q: What are the correct connection points for the temperature probes on the UNOX power board?

A: On the power board, the probe near the fan (bottom side) connects to P19 – CMB 1, and the probe near the door or ceiling connects to P16 – CMB2.

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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