133 — Ignition failure (5 attempts)

What does 133 mean?

The boiler failed to ignite after five consecutive attempts. This prevents operation and indicates a problem with the burner or gas supply.

• The gas valve is not open or there is air in the gas supply circuit
• Insufficient gas supply pressure
• Faulty flame sensing electrode or ignition components
• Condensate drainage issues

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 open and that other gas appliances in your home are working.

3. 3

   If the fault persists, contact an Authorised Service Centre to check gas supply and ignition components.