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F.447, F.448

F.447, F.448 — Burner in a fault state (Deviation, ionization current signal)

Viessmann · Vitodens 200-W Boilers

What does F.447, F.448 mean?

The burner is in an error state, indicating a deviation in the ionization current signal. This signal is critical for the appliance's ability to detect a flame.

Common Causes

  • BCU burner control unit faulty

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reset the appliance.

  2. 2

    If the fault persists, contact a qualified technician.

  3. 3

    Ensure the appliance has been reset correctly after the initial fault.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

Connection errorConnection error and triangle symbol — Problem with connection to programming unitF.100F.100 — Electronics modules connected to PlusBus not functioning (Voltage error PlusBus)F.104F.104 — External fault message input active
Source: Viessmann Vitodens 200-W Boilers
Open Manual (Page 70)Search more codes in this manual