This error occurs when the boiler's printed circuit board (PCB) detects inconsistent or conflicting signals from the temperature sensors. Common culprits include:
For the Vaillants, the adoption of the f/64 aesthetic was particularly significant in the realm of portraiture. Unlike landscape photography, where a small aperture is often used to capture the grandeur of a scene, portraiture requires an intimacy that the "sharpness" doctrine handles differently. Edward Vaillant’s portraits from the 1930s demonstrate a rigorous adherence to texture—the weave of a suit, the stray strand of hair, the weathering of skin. This aligns with the Group f/64 belief that the photograph should reveal the essential nature of the subject. By rejecting soft-focus gimmickry, Vaillant did not merely document a face; he presented an unflinching psychological study. The camera, in his hands, became an instrument of truth, stripping away the romantic haze to reveal the character beneath. f 64 vaillant