F.24
Vaillant fault code
Vaillant F.24: safety switch-off: temperature rise too fast
Engineer only
Vaillant describes F.24 on ecoTEC plus boilers as: safety switch-off: temperature rise too fast. Possible causes Vaillant lists, for an engineer to check: pump blocked, insufficient pump output, air in the boiler, system pressure too low, non-return valve blocked or incorrectly installed.
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.