F.53 - Combustion regulation fault

What does F.53 mean?

The boiler's combustion regulation system has detected an issue, which could relate to gas pressure or the type of gas being used.

• Gas flow pressure is too low.
• Incorrect gas coding resistance used (e.g., liquid gas resistance with natural gas).
• Defective gas valve or mass flow sensor/Venturi (if fault recurs).
• Mass flow sensor/Venturi is wet or blocked (do not wet the sensor or use lubricants on the O-ring).

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 and that there is sufficient gas pressure to your property.

3. 3

   Verify that the boiler's gas coding resistance (a small component) matches the type of gas being used (natural gas or liquid gas). This typically requires a technician.

4. 4

   If the fault recurs, contact customer service. The gas valve or mass flow sensor/Venturi might be defective, wet, or blocked.