FA — Ionization current remains after controlled shutdown

What does FA mean?

The boiler detects an ionization current (indicating a flame) even after it has attempted a controlled shutdown. This is a safety critical issue as gas may still be burning or leaking.

• Incorrect ionization signal from the electrode.
• The ionization electrode or its connection cable is damaged or faulty.
• A gas valve issue, potentially allowing gas to pass even when closed.

Click steps to track your progress.

1. 1

   Check the ionization electrode and its connection cable for any damage, disconnections, or incorrect positioning.

2. 2

   Ensure the gas valve is closing completely and correctly after the burner shuts down.

3. 3

   Due to safety concerns, this issue requires inspection by a qualified gas technician to check the gas valve and other components.