Unox AS02 Error Code
Static oven floor or ceiling safety thermostat alarm (with AS01).
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox AS02 mean?
AS02 (listed with AS01) is a floor or ceiling safety thermostat alarm on the static oven accessory. A safety thermostat for the floor or ceiling heating has tripped on overheating, stopping the static oven to protect it. The main oven can still be used while the static accessory is in alarm.
Symptoms
- AS02 shown referencing the static oven
- Static oven stops heating
- Floor or ceiling overheating before the trip
- Alarm recurs after a reset attempt
Common causes
- Safety thermostat tripped by overheating
- Heating control fault driving the element too hot
- Thermostat fault
- Wiring fault to the thermostat
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Diagnostic steps
Allow cooling and reset
Let the static oven cool, reset the thermostat, and review possible causes of overheating.
Check heating control
Verify the floor/ceiling heating is not being driven continuously by a stuck control.
Test the thermostat
With power off, test the safety thermostat continuity with a multimeter.
Repair or replace
Restore faulty wiring and replace the thermostat if it does not test correctly.
When to call a professional
AS02 is a safety thermostat trip on the static oven indicating a possible over-temperature condition. Diagnosing the heating control and thermostat is mains-voltage work for a qualified Unox technician; never bypass the safety thermostat.
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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.