What does the Viessmann Vitodens 111-W F93 fault code mean?
The F93 fault code on the Viessmann Vitodens 111-W indicates a calibration issue within the heating circuit. This can affect the boiler’s ability to maintain the desired temperature and may lead to inefficient operation.
Common Causes
- Incorrect Sensor Readings: Faulty temperature sensors can provide inaccurate data, leading to calibration errors.
- System Airlocks: Air trapped in the heating circuit can disrupt flow and affect calibration, causing the fault to trigger.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves complex calibration and potential gas safety risks. Attempting to fix it without proper training could lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F93 fault could be around £150 to £250, primarily due to the need for professional diagnosis and potential replacement of faulty sensors or addressing airlocks in the system.