What does the Viessmann Vitodens 222-F F55 fault code mean?
The F55 fault code on the Viessmann Vitodens 222-F indicates a failure in the system reset process. This typically suggests that the boiler is unable to reset itself due to an internal fault or communication issue.
Common Causes
- Electrical Issue: A problem with the boiler’s electrical components, such as a faulty circuit board, can prevent the system from resetting properly.
- Sensor Malfunction: A malfunctioning temperature or pressure sensor may cause the boiler to misinterpret its operational status, leading to a reset failure.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it may involve complex electrical or gas components that require professional expertise to diagnose and repair safely.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F55 fault could range from £150 to £300, depending on whether a circuit board replacement or sensor repair is needed. This estimate accounts for parts and labour costs typical for such repairs.