Unox WF31 Error Code
Fumes board temperature warning.
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox WF31 mean?
WF31 is a fumes board temperature warning. The gas fumes board itself is running outside its safe temperature range. As a warning the oven continues with reduced function while indicating the fumes electronics are overheating and need attention.
Symptoms
- WF31 warning on a gas oven
- Fumes board running hot
- Warning during extended gas operation
- Warning clears as the board cools
Common causes
- Inadequate cooling of the fumes board
- High ambient temperature around the electronics
- Cooling fan issue affecting the board
- Fumes board fault
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Diagnostic steps
Allow cooling
Let the appliance cool and check whether the warning clears.
Check cooling airflow
Verify cooling airflow over the fumes board and that any relevant fan runs.
Check the installation
Confirm the oven has adequate clearance and ventilation per the installation manual.
Service the board
If the board overheats despite correct cooling, have it checked and replaced if faulty.
When to call a professional
WF31 is on a gas appliance and indicates overheating electronics. Diagnosing the cooling and the fumes board should be done by a technician qualified to service gas appliances, particularly if the warning recurs after a cool-down.
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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.