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 WF20: Rotor Valve EG1 Fault
Caution / Monitor Closely
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 code WF20 indicates a malfunction with Rotor Valve EG1, which controls water flow within the appliance. This points to a mechanical obstruction, electrical fault, or control circuit issue. Prompt repair is crucial to restore full functionality and prevent further problems.
Technical Details
Repair Steps:
- Safety First: Disconnect the combi oven from the main power supply before any inspection or service. Ensure proper lockout/tagout procedures are followed.
- Locate Rotor Valve EG1: Identify Rotor Valve EG1 within the oven’s plumbing system. Refer to the UNOX service manual for its exact location, often near the water inlet or steam generator.
- Visual Inspection: Check the valve and its surrounding connections for any visible damage, leaks, calcification, or obstructions. Ensure all wiring connections to the valve are secure and free from corrosion or burning.
- Electrical Continuity Test: With the power off, use a multimeter to check the continuity of the valve’s coil. Compare resistance readings against manufacturer specifications. An open circuit or incorrect resistance indicates a faulty coil.
- Voltage Supply Check: With caution and appropriate safety measures, reconnect power and check for the correct voltage supply to the rotor valve’s terminals when it’s supposed to be active (e.g., during a wash cycle or steam generation phase). No voltage or incorrect voltage points to a control board issue or wiring fault.
- Inspect Water Supply/Drain: Ensure adequate water pressure to the oven and verify that drain lines are clear and unobstructed, as blockages can indirectly affect valve operation.
- Replace Rotor Valve EG1: If the valve’s coil is faulty, it’s mechanically stuck, or if it doesn’t respond to correct voltage, replace the entire Rotor Valve EG1 unit with a genuine UNOX spare part.
- Reset Error: After replacement or repair, restore power and attempt to clear the error code through the oven’s control panel or by cycling the power.
Common Questions:
Q: What is Rotor Valve EG1’s function in a UNOX combi oven?
A: Rotor Valve EG1 is a critical component responsible for controlling the precise flow and distribution of water within the oven, often regulating water for the steam generator, washing cycles, or condensation management.
Q: Can a clogged water filter cause a Rotor Valve EG1 error?
A: While not a direct cause, severe restriction from a clogged water filter could potentially reduce water pressure enough to impede the proper functioning of water flow components like the rotor valve, leading to related errors or poor performance.
Q: Is it safe to operate the oven with a WF20 error?
A: It is generally not recommended to operate your UNOX oven with a WF20 error. The oven’s functionality, especially steaming and cleaning, will be compromised, and continued operation could potentially lead to further damage to other components.
When to call a technician
Consider calling a certified technician if:
- The error keeps coming back after you've tried the steps above.
- You're not comfortable doing the checks or repairs yourself.
- You notice unusual noise, smell, or behaviour.
- Equipment is under warranty and you want official service.
- You need the unit back in service quickly with minimal downtime.