BoilerFaultCodesViessmann 52 Fault Code
The Viessmann 52 fault code means: your boiler has detected an electrical fault in the sensor that monitors the temperature of the water flowing through the system, causing the unit to stop operating as a safety precaution.. It appears on 4 Viessmann models in our database.
Technical description: Short circuit, flow sensor
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 52 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 52 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 WB1B manual (PDF)
- Viessmann Vitodens 242-F FB2B manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026