BoilerFaultCodesViessmann 92 Fault Code
The Viessmann 92 fault code means: your solar heating system has a faulty sensor or a wiring problem that is preventing it from correctly monitoring the temperature of the roof panels.. It appears on 6 Viessmann models in our database.
Technical description: Control mode - Solar: Collector temperature sensor shorted out
What causes the Viessmann 92 fault?
This fault occurs when the electrical signal from the roof-mounted solar sensor is interrupted or distorted, usually due to a physical break in the cable or water ingress into the sensor housing. Over time, exposure to extreme roof temperatures and UV light can cause the protective wiring to degrade or the internal sensor component to fail entirely.
This fault is more common following a heatwave or a severe storm, as extreme high temperatures can degrade the sensor while heavy rain can enter damaged wiring connections.
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 92 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 92 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 manual (PDF)
- Viessmann Vitodens 100-W B1GA manual (PDF)
- Viessmann Vitodens 100-W WB1A manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026