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 - Error WF27: Lack of Water or EL1 Solenoid Valve Malfunction
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, error WF27 indicates insufficient water supply to the oven or a faulty EL1 water inlet solenoid valve. This will prevent proper operation and steam generation, halting cooking cycles. Begin by thoroughly checking the external water supply, filtration system, and then proceed to inspect the EL1 solenoid valve for blockages or electrical issues.
Technical Details
Repair Steps:
- Verify External Water Supply: First, ensure the main water tap supplying the UNOX CHEFTOP/BAKERTOP oven is fully open. Check the water pressure – UNOX ovens typically require a minimum of 2-6 bar (29-87 psi). A kinked or damaged water inlet hose can also restrict flow.
- Inspect Water Inlet Filter: Locate and carefully inspect the external water filter and any internal pre-filters for sediment, scale, or debris accumulation. A clogged filter will severely restrict water flow and trigger low water pressure warnings. Clean or replace the filter cartridge as necessary.
- Check EL1 Solenoid Valve: The EL1 valve is the primary water inlet solenoid. With the oven powered OFF and disconnected from the mains, visually inspect the valve for any physical damage or leaks. A qualified technician should:
- Measure the electrical resistance across the solenoid coil terminals. Refer to UNOX technical documentation for the expected Ohm value (typically around 0.8-1.5 kOhm). An open circuit or very low resistance indicates a faulty coil.
- Check for proper voltage supply to the valve during a water fill cycle (e.g., when the oven is attempting to generate steam or clean). No voltage suggests a control board issue, while voltage without valve opening points to a mechanical failure within the valve.
- If the valve is electrically sound, it might be mechanically stuck. Lightly tapping it might dislodge debris, but often replacement is required if it fails to open.
- Examine Water Pressure Switch/Sensor: Some UNOX models use a water pressure switch or sensor to detect adequate water flow. Locate this component (often near the water inlet) and inspect its connections. A faulty sensor could inaccurately report low water, even if pressure is adequate.
- Inspect Wiring and Connections: Trace the wiring from the EL1 solenoid valve and any associated sensors back to the main control board (PCB). Look for loose, corroded, or damaged wires or connectors. Ensure all plugs are securely seated.
- Consult Main Control Board (PCB): If all external components and wiring appear functional, the issue may lie with the main control board’s ability to send power to the EL1 valve or process signals from water sensors. This typically requires professional diagnosis and potentially a PCB replacement.
- Reset and Test: After performing any checks or repairs, reconnect power to the oven. Turn it on and attempt a function that requires water (e.g., steam cooking cycle or a cleaning program) to see if the WF27 error has cleared.
Common Questions:
Q: What does UNOX error code WF27 specifically indicate?
A: UNOX error code WF27 specifically indicates either a critical lack of water supply reaching the oven or a malfunction of the EL1 solenoid valve, which controls the main water inlet. Both conditions prevent the oven from operating correctly, especially for steam functions.
Q: How can I perform basic checks for a WF27 error on my UNOX oven?
A: Start by ensuring the main water supply valve to the oven is fully open and that water pressure is adequate. Then, inspect the external water filter for any blockages. For the EL1 valve, ensure it’s clean and its electrical connections are secure (with power off).
Q: Is it safe to operate my UNOX oven with a WF27 error?
A: No, it is not recommended to operate your UNOX oven with a WF27 error. Lack of water can lead to serious damage to heating elements, the steam generator, and other internal components. The oven will likely restrict or prevent operation until the issue is resolved.
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.