E133 — Gas supply fault or ignition failure

What does E133 mean?

The boiler has failed to ignite, indicating a problem with the gas supply or the ignition system. This includes cases where the condensate trap is frozen or blocked.

• No gas supply or interrupted gas supply.
• Faulty spark electrode or sensing electrode, or their cables.
• Flue gas recirculation.
• Blocked or frozen condensate trap.

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 valve to your property is fully open and other gas appliances are working.

3. 3

   Check the condensate drain pipe outside for blockages or freezing, especially in cold weather.

4. 4

   If the error persists, a qualified technician should inspect the ignition system, gas supply pressure, and condensate trap.