F.68
Vaillant fault code
Vaillant F.68: unstable flame signal
Engineer only
Vaillant describes F.68 on ecoTEC plus boilers as: unstable flame signal. Possible causes Vaillant lists, for an engineer to check: air in gas, gas flow pressure too low, incorrect air ratio, condensate duct blocked, incorrect gas restrictor, ionisation flow interruption.
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.