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F.299

F.299 — Time/date incorrect (Real time clock setting incorrect)

Viessmann · Vitodens 200-W Boilers

What does F.299 mean?

The appliance display shows an incorrect time or date, indicating an issue with the real time clock setting. This can affect scheduled operations.

Common Causes

  • Real time clock setting incorrect

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Set the correct time and date on the appliance.

  2. 2

    Ensure the new settings are saved.

  3. 3

    If the time or date frequently resets or displays incorrectly, contact a qualified technician.

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