con
Vaillant fault code
Vaillant con: no communication with the PCB
Engineer only
Vaillant describes con on ecoTEC plus boilers as: no communication with the PCB. Possible causes Vaillant lists, for an engineer to check: communication fault between the display and the PCB in the electronics box.
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.