Unox WF38 Error Code
Flame control board warning.
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox WF38 mean?
WF38 is a flame control board warning on gas ovens. The board that manages burner ignition and flame detection has reported a problem. As a warning the oven keeps limited operation while flagging that the flame-control electronics need attention.
Symptoms
- WF38 warning on a gas oven
- Intermittent ignition or flame detection issues
- Possible related gas alarms
- Warning recurs during gas operation
Common causes
- Flame control board fault
- Wiring fault to the flame board
- Flame-detection electrode or sensing issue
- Connector problem at the board
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Diagnostic steps
Power down and inspect
Turn off the appliance and inspect the flame control board and its connections.
Check flame detection
Verify the flame-detection electrode and wiring are intact and correctly positioned.
Test the board wiring
Check the wiring to the flame control board with a multimeter.
Replace the board
Replace the flame control board if it remains faulty and retest ignition.
When to call a professional
WF38 concerns the gas flame-control system. All work on ignition, flame detection and the flame control board must be done by a technician qualified to service gas appliances. Do not keep operating a gas oven with unresolved flame-control warnings.
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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.