E7 — Ionization current too low during calibration

What does E7 mean?

The burner is in a fault mode because the ionization current detected during calibration is too low.

• Incorrect distance of the ionization electrode to the burner gauze assembly
• Contamination of the ionization electrode
• Loose or damaged connecting lead and plug-in connections for the electrode
• Flue gas recirculation in the flue system

Click steps to track your progress.

1. 1

   Press the reset button 'R' on the boiler.

2. 2

   Contact a qualified heating technician to check and adjust the distance of the ionization electrode to the burner gauze assembly.

3. 3

   A technician should also check for contamination of the electrode, verify connecting lead integrity, and inspect the flue system for recirculation.