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Viessmann Vitodens 050-W fault 5A

Lead break, flow sensor

Gas boiler

What it means

Burner is blocked due to a lead break detected on the flow sensor.

Likely causes

  1. Lead break, flow sensor
  2. Faulty flow sensor A

Where to start

  1. Check connections and leads
  2. Replace sensor if required
  3. Drain the boiler on the DHW side.

The full answer, free

  • 4 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 56), 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 050-W. Check the model on the data plate before you order parts.

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