Unox WF29 Error Code
Gas fumes temperature warning.
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox WF29 mean?
WF29 is a gas fumes temperature warning on gas ovens. The temperature of the combustion fumes is outside the expected range, which can indicate a combustion, flue or fumes-probe issue. As a warning the oven keeps running with reduced function while flagging the abnormal fumes temperature.
Symptoms
- WF29 warning on a gas oven
- Abnormal fumes/flue temperature
- Possible combustion irregularity
- Warning recurs during gas operation
Common causes
- Combustion running too hot or too cold
- Fumes temperature probe out of range
- Flue or exhaust restriction
- Burner setup or gas pressure issue
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Diagnostic steps
Inspect the flue
Check the fumes/exhaust path for restriction or blockage with the appliance off.
Check the fumes probe
Verify the gas fumes temperature probe is connected and reading plausibly.
Review combustion
Have the burner setup and gas pressure checked so combustion is within spec.
Escalate to gas service
If the fumes temperature stays abnormal, have a qualified gas technician run the gas fumes test.
When to call a professional
WF29 relates to gas combustion fumes. Any work on combustion, the flue or the fumes probe — including the CO/CO2 fumes test — must be done by a technician qualified to service gas appliances. Do not ignore recurring gas fumes 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.