E129 — Frequent loss of flame during ignition

What does E129 mean?

The boiler has repeatedly lost its flame during the ignition sequence, even with maximum correction attempts.

• Faulty or dirty sensing electrode or spark electrode.
• Damaged cable to the electrodes.
• Insufficient gas supply or unstable gas pressure.
• Flue gas recirculation.

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 and spark electrodes, their cables, and the gas supply.