On some Hotpoint washer-dryer models with vertical drum, F16 indicates drum lock or position error; drum may not rotate.

Safety: Unplug the appliance before accessing internal components.

• Check for mechanical jams: Gently rotate the drum by hand. If it is jammed, inspect for foreign objects between drum and tub.
• Inspect position sensor: On models equipped with a drum position sensor, locate it near the drum shaft or lock mechanism. Check wiring and connector for damage.
• Test sensor (advanced): Use a multimeter to verify sensor operation according to service data (often a Hall sensor or microswitch). Replace if faulty.
• Control board: If the sensor and wiring are good, the PCB may not be reading the signal correctly and may require replacement.