Unox AM04

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

Diagnostic steps

1. 01

   Allow cooling

   Let the Slowtop cool so the motor thermal protection can reset.

2. 02

   Check the motor mechanically

   With power off, confirm the fan turns freely and is not stuck.

3. 03

   Test the motor circuit

   Measure the motor windings and capacitor and check the wiring with a multimeter.

4. 04

   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.