E70 — Flame signal problem or micro interruption

What does E70 mean?

The boiler is experiencing issues with its flame detection system, including possible brief interruptions of the flame signal.

• Faulty or dirty sensing electrode.
• Damaged cable to the sensing electrode.
• Poor electrical continuity between the burner and earth.
• Flue gas recirculation.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the boiler, wait 30 seconds, then turn it back on.

2. 2

   Attempt to reset the boiler if a reset button is available.

3. 3

   A qualified technician should check the sensing electrode, its cable, and the earthing of the burner.