F.346 — Burner in fault state: Ionization current calibration error

What does F.346 mean?

The burner is in a fault state due to an ionization current calibration error. This affects the boiler's ability to accurately detect and maintain a flame.

• Incorrect gas supply pressure
• Contaminated gas solenoid valve strainer
• Contaminated ionization electrode
• Flue gas recirculation
• Faulty connecting cable to the fan unit
• Condensate backup

Click steps to track your progress.

1. 1

   Check the gas supply pressure and ensure it is correct for your boiler.

2. 2

   Inspect the gas solenoid valve strainer on the inlet side for contamination.

3. 3

   Check the ionization electrode for contamination and the flue system for recirculation. Reset the boiler afterwards.