Electrolux Professional EtUb Error Code

What does Electrolux Professional EtUb mean?

EtUb signals a boiler over-temperature on the SkyLine oven that stops boiler cycles but is recoverable. The alarm clears once the boiler cools. It is most often caused by missing water or limescale build-up in the boiler, and the manual links the fix to the boiler descaling procedure using the specified cleaning tablets.

Symptoms

• EtUb displayed and boiler cycles stopped
• Boiler runs hotter than normal
• Alarm clears after the boiler cools
• May follow a missed descale interval

Common causes

• Missing water in the boiler (electric-heated appliances)
• Limestone accumulation in the boiler
• Parameter BOT set too low

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Diagnostic steps

1. Wait for the boiler to cool

   The alarm will disappear once the boiler temperature drops.

2. Run the maintenance boiler cycle

   Run the maintenance boiler cycle using the quantity of C25 tablets given in the manual's boiler descaling procedure.

3. Descale again if needed

   If the alarm re-appears, descale the boiler again following the same procedure.

4. Check water supply

   Confirm the boiler is receiving water so it does not run dry.

5. Call Service if it persists

   If the problem persists after descaling, call Service.

When to call a professional

Run the documented descaling cycle first. If EtUb persists after descaling and confirming water supply, call an Electrolux Professional service centre. A boiler that keeps overheating despite descaling can have a deeper scaling problem, a sensor fault, or an incorrect BOT parameter, none of which kitchen staff should attempt to adjust. Repeated boiler over-temperature alarms warrant professional inspection.