F.28 - Failure during start-up: Ignition unsuccessful

What does F.28 mean?

The boiler failed to ignite during the start-up sequence. This can be caused by numerous issues related to the gas supply, ignition system, or electrical connections.

• Gas meter or gas pressure monitor fault, air in gas, or low gas flow pressure.
• Condensate duct blocked or incorrect gas restrictor.
• Faulty gas valve or its connections to the PCB.
• Defective ignition system (transformer, cable, plug, electrode) or earthing, or electronics fault.

Click steps to track your progress.

1. 1

   Press the reset button on the boiler display up to three times to try and clear the fault.

2. 2

   Ensure the main gas supply valve to the boiler is fully open.

3. 3

   Check for any obvious blockages in the condensate duct and clear if necessary.

4. 4

   Contact customer service. This fault has many potential causes related to gas supply, ignition, and electrical connections that require expert diagnosis.