E128 — Flame failure during operation

What does E128 mean?

The boiler has experienced a flame failure during normal burner operation, meaning the flame extinguished unexpectedly.

• Faulty or dirty sensing electrode.
• Damaged cable to the sensing electrode.
• Insufficient gas supply.
• Flue gas recirculation.
• Issues with combustion parameters.

Click steps to track your progress.

1. 1

   Press the 'Reset' button on the boiler for 1-3 seconds.

2. 2

   Ensure the main gas supply to the property is open and other gas appliances are working.

3. 3

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

4. 4

   If the error persists, a qualified technician should check the sensing electrode, its cable, gas supply, and the flue system.