Appliance
Maintenance Code or Reminder Light: Filter, Descale, Vent Check

What it
usually means.

Modern appliances track their own upkeep. A refrigerator counts days or gallons since the filter was changed and lights a reminder; a hood counts fan hours and asks for its grease or charcoal filters; a steam oven counts steam cycles and asks to be descaled; a dishwasher shows rinse aid and salt symbols; a front-loading washer counts washes and asks for a tub clean; many laundry machines watch their own airflow and show a vent or exhaust warning when it falls. These are maintenance codes: they clear when the job is done and the reminder is reset, and no part is needed. Other codes report problems that upkeep causes and upkeep fixes, such as a drain that is slow because the filter is full, a warm-temperature alarm on a unit whose coil is clogged or whose door was left open, or a water code from a kinked supply line or a clogged inlet screen. Then there are codes that mean a part has failed: a sensor reading open, a board that failed its self-test, a motor that did not start. Those are repairs, and the sister repair site for that appliance has them by make. The same code means different things on different makes, so the make and model always come first. On this site, codes are grouped into families by what they ask for: reminders, filters, vents and airflow, water, fill and drain, scale and descaling, temperature, sensors, and controls and power.