E133 — Gas Supply Interruption or Ignition Failure

What does E133 mean?

This code signifies that the boiler has failed to ignite or detect a flame, or the gas supply has been interrupted. The display shows 'E1' alternating with '33'. This will prevent the boiler from producing heat or hot water.

• Main gas supply turned off.
• Gas meter isolation valve closed.
• Faulty ignition electrodes or flame sensing electrode.
• Issue with the gas valve.

Click steps to track your progress.

1. 1

   Turn the selector switch fully anticlockwise to the 'Reset' position and hold for 5 seconds.

2. 2

   Check that the main gas supply to your property is on (e.g., check other gas appliances like a hob).

3. 3

   Verify that any gas isolation valves near the boiler are open.

4. 4

   If the error persists, contact a qualified heating engineer to check the gas supply and ignition system.