F.73
Vaillant fault code
Vaillant F.73: water pressure sensor signal in the wrong range (too low)
Engineer only
Vaillant describes F.73 on ecoTEC plus boilers as: water pressure sensor signal in the wrong range (too low). Possible causes Vaillant lists, for an engineer to check: break or short circuit in the water pressure sensor or its supply line, or water pressure sensor defective.
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.