Vaillant · Turbomax Plus Boilers
This error code signifies a general problem with the EcoMax Pro boiler's ignition system, meaning it's unable to light the burner.
Click steps to track your progress.
Check your gas supply by verifying other gas appliances work.
Turn off the boiler at the main switch, wait for 30 seconds, and then turn it back on.
Ensure the condensate pipe is not frozen if it runs outside.
If the fault continues, contact a qualified heating engineer to investigate the ignition components.