Unox WL02 Error Code
Prover power board over temperature alarm.
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox WL02 mean?
WL02 is a power board over-temperature alarm on the prover accessory. The prover's power board is running too hot. As a warning the prover continues with reduced function while flagging the overheating electronics, usually a cooling or installation issue.
Symptoms
- WL02 warning referencing the prover
- Prover power board running hot
- Warning during extended use
- Warning clears as the board cools
Common causes
- Inadequate cooling of the power board
- High ambient temperature around the prover
- Cooling airflow issue
- Power board fault
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Diagnostic steps
Allow cooling
Let the prover cool and check whether the warning clears.
Check cooling airflow
Verify cooling airflow over the board and adequate clearance around the prover.
Check the installation
Confirm the prover is installed per the manual with proper ventilation.
Service the board
If overheating persists with correct cooling, have the power board checked and replaced if faulty.
When to call a professional
WL02 affects the prover electronics. Diagnosing the cooling and power board requires accessing the accessory and mains-voltage work; have a qualified Unox technician investigate if a cool-down does not resolve it.
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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.
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