Vaillant · Turbomax Plus Boilers
This indicates a problem with the flow Negative Temperature Coefficient (NTC) thermostat cable in your Turbomax Plus boiler. The cable may be defective, broken, or have a faulty connection.
Click steps to track your progress.
Check all visible cable connections to the boiler's NTC sensor for any looseness or damage.
Restart the boiler by switching it off and on at the main power supply.
If the error persists, contact a qualified heating engineer to inspect or replace the NTC cable.