Error Code
high
Unox OVEN – Control Panel or USB Board Defective – Buzzer Does Not Sound
On your CHEFTOP and BAKERTOP MIND.Maps™ unit, a non-sounding buzzer often indicates…
Unox OVEN - Motors Do Not Invert Sense of Rotation - 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, motors failing to invert rotation leads to uneven cooking. This issue often stems from a faulty braking element or the power board. Begin by checking the braking element's resistance; if it's within spec, the power board likely requires replacement.
Technical Details
Repair Steps:
- Safety First: Safely power down and disconnect the UNOX CHEFTOP or BAKERTOP MIND.Maps™ oven from its electrical supply. Allow any hot components to cool.
- Locate and Access: Carefully open the oven’s service panels to gain access to the motor assembly and its associated braking element. Refer to your oven’s technical manual for precise location and access instructions.
- Measure Braking Element Resistance: Using a multimeter set to ohms, measure the resistance of the braking element. Disconnect one lead of the braking element from the circuit before measuring to ensure an accurate reading.
- Compare to Specifications: Consult your UNOX technical service manual or wiring diagram to find the specified resistance value for the braking element.
- Replace Braking Element (If Faulty): If the measured resistance does not match the technical data (or reads open/short circuit), the braking element is faulty. Replace it with a genuine UNOX spare part. Reassemble and test the oven.
- Replace Power Board (If Braking Element is Good): If the braking element’s resistance is correct and within the specified range, the issue likely resides with the power board. Replace the power board, ensuring proper connection of all cables and components.
- Test Operation: After replacing the necessary component(s) and reassembling the oven, reconnect power and conduct a test cycle to confirm that the motors now invert rotation correctly and the oven heats evenly.
Common Questions:
Q: Why is motor rotation inversion important for even cooking in my UNOX oven?
A: Motor rotation inversion, often controlling the convection fan, ensures hot air is circulated uniformly throughout the oven cavity. Without proper inversion, specific areas can become hotter or colder, leading to inconsistent cooking results, burnt spots, or undercooked sections, compromising food quality.
Q: How do I safely test the braking element’s resistance on my UNOX CHEFTOP?
A: Always ensure the oven is completely powered off and unplugged before any electrical testing. Locate the braking element (refer to your service manual), disconnect at least one of its wires from the circuit, then use a multimeter set to ohms to measure across its terminals. Compare this reading to the specified value in your UNOX technical documentation.
Q: What are the potential long-term consequences of ignoring motors that don’t invert rotation?
A: Beyond immediate issues like uneven cooking and wasted product, continued operation with this fault can put additional stress on the motor itself, other electrical components, and the power board, potentially leading to more extensive and costly failures over time. It’s crucial to address this issue promptly to maintain oven performance and longevity.
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.