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F.404

F.404 — Burner in a fault state (BCU burner control unit faulty)

Viessmann · Vitodens 200-W Boilers

What does F.404 mean?

The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.

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 69)Search more codes in this manual