F7 — Incorrect ionization signal

What does F7 mean?

The boiler is detecting an incorrect ionization signal, which means there's a problem with how the flame is being detected or confirmed. This can lead to safety shutdowns.

• The ionization electrode or its connection cable is damaged, dirty, or incorrectly positioned.
• The heat exchanger is dirty or obstructed, affecting combustion.
• Problems with gas connection pressure or the main gas valve.

Click steps to track your progress.

1. 1

   Check the ionization electrode and its connection cable for any damage, dirt, or signs of wear.

2. 2

   Inspect the heat exchanger for any dirt or debris that could be affecting its operation.

3. 3

   Verify that the gas connection pressure is correct and the main gas tap is fully open.

4. 4

   If problems persist, professional inspection and cleaning or component replacement may be required.