Fault EF (Detailed 138) — Burner fault: flame lost immediately after ignition

What does EF mean?

The burner is in fault mode because the flame is lost almost immediately after it has successfully ignited, during the safety time. This indicates an instability or failure to maintain combustion.

• Flame is lost immediately after it has built (during the safety time)

Click steps to track your progress.

1. 1

   Check your gas supply, including gas pressure and the gas regulator.

2. 2

   Inspect the flue gas/ventilation air system for any signs of flue gas recirculation.

3. 3

   Check the ionization electrode: verify its distance to the burner gauze assembly and check for contamination (replace if required).

4. 4

   Press the reset button R on your boiler.