BoilerFaultCodesViessmann 59 Fault Code
The Viessmann 59 fault code means: your boiler has stopped working because it cannot accurately measure the temperature of the water leaving the unit, usually due to a fault in a sensor or its wiring.. It appears on 10 Viessmann models in our database.
Technical description: No DHW heating: Cylinder temperature sensor 2 lead break
What causes the Viessmann 59 fault?
This fault occurs when the boiler's control board loses communication with the sensor that monitors the heat of the water leaving the unit. It is usually caused by a physical break in the internal wiring or the sensor itself failing due to wear and tear. Because the boiler cannot safely confirm the water temperature, it shuts down to prevent the system from overheating.
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 59 fault code
Click a model for the full fault code list and model-specific repair notes.
- Vitodens 050-W Repair: £120-£200
- Vitodens 050-W BPJD Repair: £120-220
- Vitodens 100-W Repair: £120-220
- Vitodens 100-W B1GA Repair: £120-450
- Vitodens 100-W WB1A Repair: £120-220
- Vitodens 100-W WB1B Repair: £150-250
- Vitodens 111-W Repair: £150-250
- Vitodens 222-F Repair: £120-£200
- Vitodens 242-F B2UA Repair: £120-190
- Vitodens 242-F FB2B Repair: £120-190
Source
Viessmann 59 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 100-W B1GA manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026