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 - Does Not Pump In Water - Does Not Produce Steam
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 UNOX CHEFTOP and BAKERTOP MIND.Maps™ unit, if the oven does not pump water or produce steam, first ensure the tap water supply is open. Next, check for power to the steam solenoid and inspect the steam pipe for clogs. The issue typically points to a faulty steam solenoid, a power board problem, or a blocked pipe.
Technical Details
Repair Steps:
- Verify Tap Water Supply: Ensure that the tap water valve connected to the oven is fully open. A closed or partially closed valve is a common cause for no water intake.
- Check Power Supply to Steam Solenoid: With a multimeter set to V AC, measure the power supply reaching the steam solenoid.
- If there is no power supply, the power board is likely faulty. Proceed to replace the power board.
- If power is present, move to the next step.
- Inspect Steam Pipe for Clogging: Check the steam pipe for any signs of obstruction or clogging, often caused by scale or mineral deposits.
- If the pipe is clogged, carefully clean it out. Also, assess and improve the quality of your incoming water supply to prevent future clogging.
- If the steam pipe is clear, proceed to the final diagnostic step.
- Replace Steam Solenoid: If tap water is open, power is supplied to the solenoid, and the steam pipe is not clogged, the steam solenoid itself is likely defective. Replace the steam solenoid valve.
Common Questions:
Q: Why is my UNOX CHEFTOP or BAKERTOP MIND.Maps™ oven not pumping water?
A: This issue commonly stems from a closed tap water supply, a lack of power reaching the steam solenoid, a clogged steam pipe, or a failure of the steam solenoid valve or the main power board itself.
Q: How do I test the steam solenoid in my UNOX oven?
A: To test, set a multimeter to V AC and measure the voltage across the terminals of the steam solenoid when the oven attempts to call for steam. If voltage is present but no water flows, the solenoid is likely faulty.
Q: What causes the steam pipe to clog in UNOX combi ovens?
A: Steam pipe clogging is typically caused by mineral buildup, such as limescale, from hard water. Regularly checking water quality and ensuring proper water treatment (e.g., using a water filter or softener) can prevent this.
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.