Unox AM03 Error Code
Slowtop safety thermostat alarm.
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox AM03 mean?
AM03 is a safety thermostat alarm on the Slowtop accessory. The Slowtop's safety thermostat has tripped on overheating, so the accessory stops to protect itself. The main oven can still be used while the Slowtop is in alarm.
Symptoms
- AM03 shown referencing the Slowtop
- Slowtop stops heating
- Slowtop 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 Slowtop cool, reset the thermostat, and consider causes of overheating.
Check heating control
Verify the Slowtop 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
AM03 is a safety thermostat trip on the Slowtop 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.