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Viessmann Vitodens 100-W fault 457

Burner in a fault state

Gas boiler

What it means

Fan is sluggish or blocked.

Likely causes

  1. Faulty fan connecting cables
  2. Fan power supply failure
  3. Fan sluggish or blocked

Where to start

  1. Check the fan connecting cables.
  2. Check the fan power supply.
  3. Check fan for sluggishness

The full answer, free

  • 15 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 83), right under the answer
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Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.

From the Viessmann manual for the Vitodens 100-W. Check the model on the data plate before you order parts.

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