Electrolux Professional GbCU

What does Electrolux Professional GbCU mean?

GbCU means the upper cavity gas burner on a gas SkyLine oven has locked out, and the cooking cycle is paused. The oven will not operate until burner function is restored. It is commonly caused by air in the gas line, a closed gas supply, an electrical supply issue to the burner system, or an internal burner failure.

Symptoms

• GbCU displayed and the cycle pauses
• Upper cavity gas burner not igniting
• Oven will not operate until burner restored
• 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 problem persists, call Service.

When to call a professional

Staff can confirm the gas main valve is open and power-cycle the oven. Call an Electrolux Professional gas engineer if GbCU persists after these steps, since air in the supply, an electrical fault in the burner system, or an internal burner failure require trained gas diagnosis. Gas burner faults must be handled by a qualified technician, both for correct repair and for safety.