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 - Heating Elements or Contactors Damaged: Does Not Heat
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, an oven that fails to heat typically points to damaged heating elements or faulty contactors. Systematically measure the oven's amp consumption and verify the voltage supply to the contactors. Depending on diagnostic findings, replacement of the power board, contactors, or individual heating elements will resolve the issue.
Technical Details
Repair Steps:
- Safety First: Always disconnect power to the UNOX CHEFTOP/BAKERTOP MIND.Maps™ oven before performing any electrical checks to prevent injury or further damage.
- Measure Oven Amp Consumption: Use a clamp meter to measure the total amp consumption of the oven directly on the main terminal block.
- Compare to Technical Data: Refer to the technical data (available on Infonet) for your specific UNOX model. If the measured phase consumption does not match, proceed to check the contactors.
- Check Contactor Circuit Closure: Verify if the contactors responsible for activating the heating elements are closing the circuit properly.
- Measure Contactor Coil Voltage: If the contactors are not closing, use a multimeter set to V AC to check the voltage between the A1 and A2 pins of the contactor coil. Ensure the power board is supplying the correct activation voltage.
- Assess Power Board Output: If the power board is supplying 230 V AC (or the specified control voltage) to the contactor coil, but the contactor is not engaging, then replace the faulty contactors.
- Replace Power Board (if no voltage): If the power board is NOT supplying the correct voltage to the contactor coil, then the power board itself is likely faulty and requires replacement.
- Measure Individual Heating Element Consumption: If the contactors are found to be functioning correctly, proceed to measure the amp consumption of each individual heating element using the clamp meter.
- Replace Faulty Heating Elements: If any individual heating element shows 0 A consumption, it indicates an open circuit or damaged element. Replace the specific heating element(s) that are not drawing current.
- Restore Power and Test: Once all repairs are complete and components are securely installed, restore power to the oven and thoroughly test its heating function across all modes.
Common Questions:
Q: What are the common symptoms of damaged heating elements or contactors in a UNOX oven?
A: The primary symptom is the oven failing to heat at all, or heating inconsistently. You might also notice tripped circuit breakers, a lack of element glow, or the oven remaining cold even after extended operation.
Q: Where can I find the technical data for amp consumption for my UNOX CHEFTOP/BAKERTOP MIND.Maps™?
A: Technical data, including specific amp consumption values and wiring diagrams, is typically available on the UNOX Infonet portal for certified technicians or within the oven’s comprehensive technical manual. Access to Infonet may require a professional account.
Q: Is it safe to operate the oven if I suspect a heating element or contactor issue?
A: No, it is not safe. Issues with heating elements or contactors can pose serious electrical hazards, including fire risk, and can lead to further, more extensive damage to the appliance’s electrical system. Always disconnect power and contact a qualified technician for diagnosis and repair.
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.