Fault FC (Detailed 190) — Burner fault: faulty gas valve or blocked vent system

What does FC mean?

The burner is in fault mode because either the gas valve is faulty, there's an issue with the modulation valve control, or the vent system is blocked. This impacts gas supply and exhaust, preventing safe operation.

• Gas valve faulty or faulty modulation valve control
• Vent system blocked

Click steps to track your progress.

1. 1

   Check the gas valve for proper operation and inspect its connections.

2. 2

   Inspect the vent system for any blockages, such as debris or animal nests.

3. 3

   Press the reset button R on your boiler.

4. 4

   If the fault persists, contact a qualified technician to inspect the gas valve, modulation control, or vent system.