Unox AM04 Error Code
Slowtop motor thermal protection alarm (T > 150 °C / 302 °F).
Source: Unox/Unox_XACC-0513-EPLM_ServiceManualAll_CommercialKitchen.pdf
What does Unox AM04 mean?
AM04 is a motor thermal protection alarm on the Slowtop accessory, occurring above 150 °C (302 °F). The Slowtop fan motor's thermal protection has tripped because the motor overheated, so the accessory stops. The main oven can still be used while the Slowtop is in alarm.
Symptoms
- AM04 shown referencing the Slowtop
- Slowtop fan not running
- Slowtop stops at high temperature
- Alarm recurs after restart
Common causes
- Slowtop motor overheated and thermal protection opened
- Failed motor capacitor
- Motor mechanically stuck
- Wiring fault to the motor
- Inadequate cooling
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Diagnostic steps
Allow cooling
Let the Slowtop cool so the motor thermal protection can reset.
Check the motor mechanically
With power off, confirm the fan turns freely and is not stuck.
Test the motor circuit
Measure the motor windings and capacitor and check the wiring with a multimeter.
Replace the motor if needed
Replace the motor or capacitor if out of specification and retest.
When to call a professional
AM04 involves the Slowtop fan motor and its thermal protection. Testing windings, capacitors and wiring is mains-voltage work for a qualified Unox technician; do not keep restarting a motor that repeatedly trips on thermal protection.
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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.