Unox OVEN - Temperature Probe Not Calibrated (Fan/Bottom) - Does Not Cook Evenly

⚠️ Caution / Monitor Closely
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, an uncalibrated temperature probe near the fan/bottom of the cooking chamber can lead to uneven cooking. To resolve this, measure the actual chamber temperature with a calibrated probe. If a difference of 5°C or less is found between set and actual temperatures, an offset can be applied via the MIND.Maps™ Service and User Menu to correct the discrepancy.

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Technical Details

Repair Steps:

  1. Confirm Uneven Cooking: Observe the oven’s performance for signs of uneven cooking or temperature discrepancies within the cooking chamber, which indicates an issue with the back/bottom temperature probe calibration.
  2. Obtain a Calibrated Reference Probe: Acquire a certified, calibrated temperature probe that can accurately measure internal oven temperatures. This is crucial for determining the precise temperature difference.
  3. Perform Temperature Measurement: Place your calibrated reference probe inside the UNOX cooking chamber, positioning it as close as possible to the oven’s internal temperature probe (typically near the fan guard on the bottom side). Set a stable cooking temperature (e.g., 180 °C) on your UNOX unit and allow the oven to reach and stabilize at this temperature.
  4. Calculate the Temperature Difference: Once stabilized, record the oven’s set temperature (Tset) and the actual temperature measured by your calibrated reference probe (Tchamber). Calculate the difference: Difference = Tset - Tchamber. For example, if Tset = 180 °C and Tchamber = 176.9 °C, the Difference is +3.1 °C.
  5. Determine the Offset Value: If the calculated temperature difference is 5 °C or less, an offset can be applied. The offset value to input into the UNOX system is the difference multiplied by 10. If Tset - Tchamber = +3.1 °C, you should set -31 in the back/bottom probe offset to compensate. (0.1 °C equals 1 in the scale of values). A positive difference (Tset > Tchamber) means the oven is running colder than it thinks, so the offset should be negative to make the probe read lower and cause the oven to heat more.
  6. Apply the Offset in the Service Menu: Access the “MIND.Maps™ Service and User Menu” on your UNOX CHEFTOP or BAKERTOP unit. Navigate to the section dedicated to temperature probe offsets and locate the setting for the “back/bottom probe offset.” Input the calculated offset value.
  7. Monitor and Verify: After applying the offset, run the oven through typical cooking cycles and observe its performance. Verify that cooking is now even and that the internal temperatures are consistent with the set values across the cooking chamber.

Common Questions:

Q: What causes uneven cooking in a UNOX oven?

A: Uneven cooking in UNOX CHEFTOP and BAKERTOP MIND.Maps™ can be caused by an uncalibrated temperature probe, particularly the one located near the fan or bottom of the cooking chamber. This results in the oven’s control system misinterpreting the actual internal temperature.

Q: How do I know if my UNOX oven’s temperature probe needs calibration?

A: If you observe inconsistent cooking results, such as uneven browning, different doneness levels across the cooking chamber, or if the oven display temperature significantly deviates from a known accurate external thermometer, your probe may need calibration.

Q: Is it safe to continue using a UNOX oven with an uncalibrated temperature probe?

A: While the oven may still operate, using it with an uncalibrated probe will lead to inconsistent and potentially undercooked or overcooked food, compromising food safety and quality. It is recommended to address the calibration issue promptly.

When to call a technician

Consider calling a certified technician if:

  • The error keeps coming back after you've tried the steps above.
  • You're not comfortable doing the checks or repairs yourself.
  • You notice unusual noise, smell, or behaviour.
  • Equipment is under warranty and you want official service.
  • You need the unit back in service quickly with minimal downtime.

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