: It resets the "filtered weight counter" (typically 150 lbs). Without entering this valid, unique code, the machine will eventually and prevent further recovery operations. Common Issues & Maintenance Tips Lock-out Warnings

For Elias, that number wasn't just a tracking code for a filter—it was a timestamp. He remembered the day he’d etched his initials next to it with a screwdriver, back when the shop was still his father’s and the air smelled more like coffee than Freon.