Resetting the boiler If the burner fails to ignite after five attempts, the boiler will not operate and switches to “Fault”. This is indicated by the fault code F.28 or F.29 (1) and a corresponding plain text display on the display, e.g. for F.28. “Failure during starting, ignition unsuccessful” (2).The boiler will only ignite automatically again once you have reset it manually.
To reset the boiler manually, press the reset button (3) and hold for one second.
If you are unable to resolve the ignition problem yourself by resetting the boiler three times, then consult your approved competent person.