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F.71

F.71 — Burner in a fault state (Fan speed too low)

Viessmann · Vitodens 200-W Boilers

What does F.71 mean?

The burner is in a fault state because the fan speed is too low, which can impact proper combustion and flue gas removal. This might be due to blockages or incorrect settings.

Common Causes

  • Fan blockage
  • Incorrect gas type setting
  • Incorrect flue system setting

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reset the appliance.

  2. 2

    Contact a qualified technician to check the fan for blockages.

  3. 3

    A technician should also verify the gas type and flue system settings in the commissioning assistant.

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 64)Search more codes in this manual