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EE

Fault EE — Ignition or gas train issue

Viessmann · Vitodens 200-W B2HB Boiler

What does EE mean?

The boiler displays Fault EE when there is an issue with ignition, the gas combination valve, or the ionization current during the startup sequence. This means the burner is not able to establish or maintain a flame.

Common Causes

  • Faulty ignition module
  • Issues with the gas train (e.g., control voltage, gas supply pressure)
  • Incorrect ionization electrode adjustment
  • Airlocks in the gas line
  • Flue gas recirculation or leakage in the flue gas system
  • Insufficient gas flow pressure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the gas supply to the boiler to ensure it is open and at adequate pressure.

  2. 2

    Verify the ignition electrode is correctly adjusted and positioned.

  3. 3

    Inspect the gas line for any signs of airlocks or blockages.

  4. 4

    Check the flue gas system for tightness and any signs of recirculation.

  5. 5

    If the issue persists, a qualified technician should check the ignition module and gas train control voltages.

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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