Unox AS04 Error Code

What does Unox AS04 mean?

AS04 (listed with AS05) is a floor/ceiling temperature probe alarm on the static oven accessory. A temperature probe measuring the floor or ceiling has failed or is disconnected, so the static oven stops to avoid uncontrolled heating. The main oven can still be used.

Symptoms

• AS04 shown referencing the static oven
• Static oven will not heat correctly
• Implausible floor/ceiling temperature reading
• Alarm persists across restarts

Common causes

• Floor or ceiling probe disconnected
• Probe out of range or failed
• Wiring fault to the probe
• Connector problem

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Diagnostic steps

1. Power down and check the probe

   Turn off power and confirm the floor/ceiling temperature probe is connected.

2. Measure the probe

   Measure the probe with a multimeter to confirm it is within range.

3. Inspect the wiring

   Check the wiring between the probe and the static oven board.

4. Replace the probe

   Replace the temperature probe if it is out of specification and retest.

When to call a professional

AS04 affects the static oven accessory. Confirming the probe and wiring requires accessing the accessory; have a qualified Unox technician verify and replace the probe if reconnecting it does not clear the alarm.