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 Water - Cleaning Cycle Not Effective
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 fails to pump water, this is a critical issue that prevents steam generation and cleaning cycles. Immediate troubleshooting involves checking the external water supply, inspecting for clogged pipes, and testing the water solenoid valve for proper power supply. Rectifying this issue is essential to restore full oven functionality.
Technical Details
Repair Steps:
- Verify Water Supply Valve Position:
First, ensure the external tap water supply valve to the UNOX CHEFTOP and BAKERTOP MIND.Maps™ oven is fully open. A partially closed or completely shut valve will prevent water from entering the unit.
- Inspect for Clogged Water Inlet Pipes:
Carefully inspect the water inlet pipes leading to the oven for any signs of clogging or blockages. Disconnect the pipes if necessary (with water supply off) and physically check for sediment, scale buildup, or foreign objects. While inspecting, also consider the water quality; excessive hardness or impurities can lead to blockages. Consult UNOX specifications for recommended water chemical composition.
- Test Water Solenoid Valve Power Supply:
Using a multimeter set to V AC, measure the voltage supply at the terminals of the water solenoid valve. This test should be performed when the oven is attempting to pump water (e.g., during a preheating cycle or when initiating a cleaning program).
- If there is no power supply (0 V AC), this indicates a potential issue with the power board. Proceed to replace the power board as it is failing to energize the solenoid.
- If there is adequate power supply (typically 120V or 230V AC depending on model and region), this suggests the power board is functioning correctly, and the issue lies downstream.
- Replace Water Solenoid Valve:
If you’ve confirmed adequate power supply to the water solenoid valve and ruled out clogged pipes, the solenoid itself is likely faulty. A common failure mode is a seized plunger or a burnt-out coil preventing it from opening or closing. Replace the water solenoid valve with a genuine UNOX replacement part.
Common Questions:
Q: What causes a UNOX CHEFTOP/BAKERTOP MIND.Maps™ oven to not pump water?
A: The most common causes include a closed external water tap, clogged water inlet pipes due to sediment or scale, a faulty water solenoid valve, or a malfunctioning power board that fails to supply power to the solenoid.
Q: How often should I check water quality for my UNOX oven?
A: Regularly checking water quality for hardness, pH, and chloride levels is crucial. The frequency depends on your local water supply, but quarterly checks are a good baseline, especially if you notice scaling or reduced performance. Always adhere to UNOX’s specifications.
Q: Is it safe to operate a UNOX combi oven that isn’t pumping water?
A: Operating a UNOX combi oven without proper water supply will disable steam generation and cleaning cycles. While dry cooking modes might still function, core combi capabilities are compromised. It’s recommended to troubleshoot and repair the issue promptly to maintain food quality and prevent potential damage to heating elements or the steam generator.
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.