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FD

Fault FD (Detailed 227) — Burner fault: boiler coding card missing (B7 displayed)

Viessmann · Vitodens 200/222 Boilers

What does FD mean?

The burner is in a fault state, and an additional fault B7 is displayed, indicating that the boiler coding card is missing. This card contains essential operational parameters for the boiler.

Common Causes

  • Boiler coding card is missing

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the boiler coding card is correctly inserted into its slot.

  2. 2

    Press the reset button R on your boiler.

  3. 3

    If the fault persists after inserting the card and resetting, the control unit may need to be replaced by a qualified technician.

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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