Vaillant · Turbomax Plus Boilers
This indicates a problem with the Turbomax Plus boiler's gas valve's ability to close properly. This could potentially lead to the boiler exceeding its maximum safe temperature, causing a shutdown.
Click steps to track your progress.
Turn off the boiler at the mains and allow it to cool down completely.
Restart the boiler after a short wait (e.g., 5-10 minutes).
If the error reoccurs, contact a qualified heating engineer immediately as this relates to gas safety components.