The belt wraps the drum and the motor pulley. It breaks with age or when the drum is overloaded, and the symptom is a motor that runs with a drum that does not turn.
Brand repair hub
Bosch Appliance Repair
Bosch is part of BSH Home Appliances, which also owns Thermador and Gaggenau. Bosch laundry and cooking appliances use European-style components that differ from Whirlpool and GE designs.
Find the model plate
Bosch model and FD numbers are on the door frame or the inner edge of the appliance door.
Bosch repair guides by appliance
Bosch Dryer
Parts, test order and brand-specific notes for dryer repairs.
Open guide →Bosch Oven
Parts, test order and brand-specific notes for oven repairs.
Open guide →Bosch Stove or cooktop
Parts, test order and brand-specific notes for stove or cooktop repairs.
Open guide →Bosch Range
Parts, test order and brand-specific notes for range repairs.
Open guide →Bosch Washer
Parts, test order and brand-specific notes for washer repairs.
Open guide →Bosch Washer-dryer
Parts, test order and brand-specific notes for washer-dryer repairs.
Open guide →Parts for Bosch appliances
The idler keeps tension on the belt. A worn pulley bearing produces a chirp or squeal that changes with drum speed, and a seized pulley will shred a new belt.
The thermal fuse is a one-shot safety device on the exhaust path. It opens when the dryer overheats, which is why replacing it without clearing the lint blockage leads to a repeat failure.
Electric dryer elements are coiled resistance wire in a metal frame. They break with age or heat cycling, and a broken coil is often visible as a gap or a blistered section.
The igniter is a ceramic element that glows to light the gas burner. It is fragile, and a cracked igniter will glow weakly or not at all while the dryer tumbles without heat.
The blower moves air through the drum and out the vent. A cracked hub or stripped center lets the wheel spin on the shaft, so the dryer runs quietly but airflow drops and clothes stay damp.
Always order by the full model and serial number. A part that looks identical can differ in mounting, wattage or connector.