129 — Loss of flame at ignition

What does 129 mean?

The boiler detected a flame during ignition but then lost it shortly after. This can indicate an unstable flame or a problem maintaining combustion.

• Faulty flame sensing electrode or incorrect positioning
• Issues with electrode wiring or ignition components
• Fumes recirculation affecting combustion stability
• Insufficient gas supply

Click steps to track your progress.

1. 1

   Press and hold down the Reset button for 2 seconds to try clearing the fault.

2. 2

   Ensure the main gas tap to the boiler is fully open.

3. 3

   Check if other gas appliances in your home are working to confirm gas supply.

4. 4

   If the fault persists, contact an Authorised Service Centre to inspect the flame sensing electrode and check for fumes recirculation.