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F.161

F.161 — Burner in a fault state (BCU data memory access error)

Viessmann · Vitodens 200-W Boilers

What does F.161 mean?

The burner is in a fault state indicating an error accessing the data memory of the Burner Control Unit (BCU). This can prevent the burner from storing or retrieving necessary operational data.

Common Causes

  • BCU data memory access error
  • BCU burner control unit faulty

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reset the appliance.

  2. 2

    If the fault recurs, 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 65)Search more codes in this manual