F53 Fault — Combustion regulation fault

What does F53 mean?

The combustion regulation system has detected a fault. This can be caused by low gas flow pressure, using the wrong gas coding resistance, or a defective gas valve or mass flow sensor.

• Gas flow pressure too low
• LPG coding resistance used when operating with natural gas
• Gas valve defective
• Mass flow sensor/Venturi defective, wet or blocked

Click steps to track your progress.

1. 1

   Ensure the coding resistor is the correct one for your gas type (Natural Gas or LPG).

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

   Ensure the mass flow sensor/Venturi is not wet or blocked.