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6

6 — Boiler temperature has exceeded the monitoring limit

Viessmann · Vitodens 200-W B2HB Boiler

What does 6 mean?

The boiler is in a hold/wait state because its internal temperature has exceeded a safe monitoring limit, indicating potential overheating.

Common Causes

  • Faulty boiler temperature sensor
  • Insufficient water circulation
  • Overheating due to blockage

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Allow the boiler to cool down naturally.

  2. 2

    Check that the heating system's water pressure is within the recommended range.

  3. 3

    Contact a qualified heating technician to check the boiler temperature sensor and ensure proper water circulation.

Browse all codes in this manual (56)
Verified technical data. Last updated: April 2026

Related Faults

0F0F — Boiler requires service1010 — Short circuit on outdoor temperature sensor1818 — Outdoor temperature sensor cable broken
Source: Viessmann Vitodens 200-W B2HB Boiler
Open Manual (Page 82)Search more codes in this manual