What does the Viessmann Vitodens 100-W F71 fault code mean?
The F71 fault code on the Viessmann Vitodens 100-W indicates a problem with the time setting of the boiler. This may affect the operation of the heating system and could lead to incorrect heating schedules.
Common Causes
- Incorrect Time Settings: The time and date may not be set correctly on the boiler’s control panel, causing the system to malfunction.
- Power Interruption: A power cut or interruption may have reset the boiler’s internal clock, leading to the F71 error code.
Can I fix it myself? (DIY)
You can attempt to fix this issue by checking and resetting the time and date settings on the boiler’s control panel. If the problem persists or if you are unsure, it is recommended to call a Gas Safe Engineer for assistance.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for a technician to resolve the F71 fault code is approximately £100-£150, which includes diagnostics and any necessary adjustments to the time settings. This cost reflects the typical service charge for a qualified engineer in the UK.