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ED

ED — Internal fault (control unit)

Viessmann · Vitodens 200-W B2HB Boiler

What does ED mean?

The burner is in a fault mode due to an internal fault within the boiler's control unit.

Common Causes

  • Malfunction of the control unit
  • Damaged internal components

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Attempt to reset the boiler by pressing the reset button 'R'.

  2. 2

    Ensure the main power supply to the boiler is stable and secure.

  3. 3

    Contact a qualified heating technician to diagnose and replace the control unit.

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
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