F54 Fault — Insufficient gas supply

What does F54 mean?

There is not enough gas supply for the boiler to operate, often occurring with F.28/F.29 faults. This can be due to closed gas isolation cocks, low gas pressure, or a defective gas valve.

• Insufficient gas supply to operate the unit
• Gas isolator cock(s) closed
• Gas flow pressure is too low
• Gas valve defective

Click steps to track your progress.

1. 1

   Ensure all gas isolation cocks leading to the boiler are fully open.

2. 2

   Complete a gas family check in the installer menu (requires installer access).

3. 3

   Check standing and working gas pressures (requires specialist tools).

4. 4

   Take combustion readings (requires specialist tools).

5. 5

   Make sure the filter on the inlet of the gas valve is not blocked and check the flue run.