BoilerFaultCodesViessmann E3 Fault Code
The Viessmann E3 fault code means: your boiler has detected that it is overheating because it cannot effectively move the heat away from its internal components, causing it to shut down for safety.. It appears on 6 Viessmann models in our database.
Technical description: Heat transfer too low during calibration. Temperature limiter has responded.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Viessmann models that show the E3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann E3 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
- Viessmann Vitodens 050-W BPJD manual (PDF)
- Viessmann Vitodens 100-W manual (PDF)
- Viessmann Vitodens 111-W manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026