Electrolux Professional GbbU

What does Electrolux Professional GbbU mean?

GbbU means the boiler gas burner on a gas SkyLine oven has locked out, which blocks the boiler. The oven will not operate the boiler until burner function is restored. The causes mirror the cavity gas-burner alarms: air in the gas supply, a closed gas supply, an electrical supply problem, or an internal burner failure.

Symptoms

• GbbU displayed; boiler blocked
• Boiler gas burner not igniting
• Steam unavailable from the boiler
• May follow repeated ignition attempts

Common causes

• Air in the gas supply
• Gas supply is closed
• Issue with the electric supply of the burner system
• Burner system internal failure

Diagnostic steps

1. 01

   Switch the oven off and on

   If the error occurs at cycle start, switch the oven OFF then ON.

2. 02

   Check the gas main valve

   If the error occurs after five ignition attempts, check that the gas supply main valve is open.

3. 03

   Reset and retry

   Reset the error and attempt a new cycle.

4. 04

   Power-cycle and retry again

   If the error persists, switch the oven OFF/ON and attempt a new cycle again.

5. 05

   Call Service if it persists

   If the error persists, call Service.

When to call a professional

Confirm the gas main valve is open and power-cycle the oven. Call an Electrolux Professional gas engineer if GbbU persists, since boiler gas-burner faults from air in the line, electrical supply problems, or internal burner failures require trained gas diagnosis. A locked boiler burner leaves steam unavailable, and gas repairs must be handled by a qualified technician for safety.