Unox WF20 Error Code
Rotor valve EG1 fault.
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox WF20 mean?
WF20 is a warning related to rotor valve EG1, part of the oven's water/steam circuit. The oven has detected that valve EG1 is not operating as expected. As a warning it allows limited operation while flagging that this valve needs attention.
Symptoms
- WF20 warning on the control panel
- Steam or rotor function not working correctly
- Valve not actuating on command
- Warning recurs during the affected cycle
Common causes
- Rotor valve EG1 stuck or faulty
- Valve coil failure
- Wiring fault to EG1
- Blockage or scale in the valve
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Diagnostic steps
Power down and locate EG1
Turn off power and identify rotor valve EG1 in the water/steam circuit.
Check valve operation
Verify EG1 actuates when energised and is not stuck or blocked by scale.
Test the coil and wiring
Measure the valve coil and check its wiring with a multimeter.
Replace the valve
Replace rotor valve EG1 if it does not operate correctly and retest.
When to call a professional
WF20 involves a specific solenoid valve in the steam circuit. Testing the coil, wiring and replacing the valve combines electrical and plumbing work best done by a qualified Unox technician if a basic check does not clear the warning.
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Other Unox Error Codes
Motor thermal protection alarm (permanent error) — the fan motor's thermal protection has tripped.
Safety thermostat alarm — the chamber safety thermostat has tripped above its limit.
Temperature probes alarm — a cooking chamber temperature probe is damaged or disconnected.
Communication error with the power board — the control board lost communication with the power board.
Gas alarm — a fault in the gas burner/ignition system (split into multiple AF23 conditions on later software).
Wrong position of Pollo valve.
Trolley is missing.
Tank missing or safety thermostat fault.
Chamber ceiling temperature too high.
Chamber over-temperature condition (Case 1: T > 150 °C / 302 °F; Case 2: T < 150 °C).
Single-point or multi-point core probe completely damaged.
Chamber temperature probe warning.