F.49
Vaillant fault code
Vaillant F.49: eBUS fault
Engineer only
Vaillant describes F.49 on ecoTEC plus boilers as: eBUS fault. Possible causes Vaillant lists, for an engineer to check: short circuit on the eBUS, eBUS overload, or two power supplies with different polarities on the eBUS.
What you can safely do
There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.
Call a Gas Safe engineer if
- Book a Gas Safe registered engineer.
Find a Gas Safe engineer near you
Opens the official Gas Safe Register search.
Applies to: ecoTEC plus. Codes can differ between models, so check your manual.