F29 Start-up failure — Ignition unsuccessful (Gas supply/flue recirculation issue)

What does F29 mean?

The boiler failed to ignite. This could be due to a temporary interruption in the gas supply, flue gas recirculation, a blocked condensate duct, or a defective earthing of the product.

• Gas supply temporarily stopped
• Flue gas recirculation
• Condensate duct blocked
• Defective earthing of product
• Ignition transformer has spark failure

Click steps to track your progress.

1. 1

   Check inlet standing and working pressures of the gas supply (requires specialist tools).

2. 2

   Take combustion readings (requires specialist tools).

3. 3

   Check the condition of the electrode and its lead.

4. 4

   Perform a strip service (cleaning burner, clearing flue) (requires specialist tools).

5. 5

   Ensure the condense trap is not blocked.