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F.377

F.377 — Burner in a fault state (Stabilization conditions for post calibration not met)

Viessmann · Vitodens 200-W Boilers

What does F.377 mean?

The burner is in an error state because the stabilization conditions required after calibration were not met, possibly due to an incorrect gas type setting or an issue with the Burner Control Unit.

Common Causes

  • Gas type setting incorrect
  • 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 to check the gas type setting and potentially replace the BCU burner control unit.

  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 68)Search more codes in this manual