In simpler terms: The boiler’s printed circuit board (PCB) detects a flame signal when the burner should be , or the flame signal persists longer than expected before ignition starts.
No. Because F.64 involves internal electrical components and the boiler's control system, it must be diagnosed and repaired by a . Recommended Steps f 64 vaillant
You can try pressing the reset button (usually marked with a flame symbol or a crossed-out flame). If the error was a temporary "glitch," the boiler may restart. In simpler terms: The boiler’s printed circuit board