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5

Fault 5 — Flame failure during stabilization

Viessmann · Vitodens 200/222 Boilers

What does 5 mean?

The boiler has experienced a flame failure during the stabilization phase of ignition. This indicates that the flame ignited but could not be maintained or properly detected.

Common Causes

  • Flame failure during stabalization

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the ionization electrode for proper positioning, cleanliness, and any damage.

  2. 2

    Ensure all electrical connections to the ionization electrode are secure and tight.

  3. 3

    Press the reset button R on the boiler.

  4. 4

    If the fault persists, contact a qualified technician to inspect the combustion system.

Browse all codes in this manual (33)
Verified technical data. Last updated: April 2026

Related Faults

2Fault 2 — No or low gas pressure detected29Fault 29 — Open circuit at power pump module terminals 1 and L3Fault 3 — No boiler water circulation detected
Source: Viessmann Vitodens 200/222 Boilers
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