Bosch Dryer Drum Not Spinning: Causes and Safe Checks

Most Common Reasons a Bosch Dryer Drum Is Not Spinning

• The dryer never completed its start conditions: Bosch's US support starts with the plug and fully closed door; the checked WQB manual also requires a selected program and Start/Pause. The useful visible evidence is whether the display responds, the door clicks shut, and Start/Pause changes the state. If correcting one of those conditions restores tumbling, no drive repair is proved; if it does not, diagnosis must confirm supply, door-input, and accepted-start states before the drive system is blamed.
• Laundry is trapped or the load cannot move normally: The checked Bosch WQB manual identifies laundry caught at the opening as a closure problem, while an overpacked load can hide whether tumbling can begin. A caught article at the seal or a drum packed tightly enough that items cannot lift is visible evidence. If removing the obstruction or reducing the stopped load restores normal tumble, the branch ends without an internal repair; otherwise a technician must inspect the door/seal path and drum clearance for the exact E-Nr.
• The drive belt or tension system no longer transmits motor movement: This remains a service hypothesis, not a verdict from the symptom. The owner-visible clue is a start response or motor/airflow sound while the drum stays stationary, sometimes after a new rhythmic sound; silence or easy hand movement does not prove a belt failure. A technician must inspect the exact E-Nr belt path, tension system, and motor-to-drum transmission before naming a part.
• The drum support system is dragging or jammed: Prior rhythmic thumping, scraping, an off-center drum, or increasing resistance can point toward supports or foreign-object contact. Bosch layouts vary by E-Nr, so a technician must reproduce the drag with power isolated and inspect the documented supports, clearances, and hidden object paths rather than infer a roller or glide from sound alone.
• The motor, wiring, or control is not producing rotation: If the visible Bosch start checks pass and no mechanical obstruction is found, the commanded drive may not develop rotation. The visible endpoint is an accepted start with no tumble after the safe checks. Diagnosis must separate a stalled motor or mechanical load from wiring, feedback, and control output using the exact E-Nr data.

Use the Visible State to Choose the Next Action

• No display or response: Use the separate no-power/no-start route; this state does not yet prove a drum-drive failure.
• Display responds but no start is accepted: Preserve the display and complete the single documented visible-start pass below.
• The start is accepted but the drum stays still: Stop after that observation and capture the evidence listed below for drive-system diagnosis.
• Scraping or rhythmic noise came before the no-tumble state: Do not restart; preserve the timing and a prior recording if one already exists.
• “Hot” appears while the drum still rotates: On current WQB heat-pump models Bosch identifies this as cooling, so it is not the stationary-drum state.

Bosch Platform Boundaries

• WQB heat-pump: Compressor, fan, and condensate-pump operation does not explain a stationary drum. Refrigerant circuit work is never an owner step.
• WTG/WTB condenser: Do not convert a no-tumble complaint into a condenser-cleaning diagnosis. The heat exchanger affects drying performance; the drive system still needs separate proof.
• WTA legacy vented: The exhaust path matters for heat and drying, but a blocked vent does not by itself identify why the drum is stationary. Exact legacy E-Nr documentation controls the drive layout.

What You Can Check Safely

• Identity and state: Photograph the complete E-Nr/FD and the unchanged display before pressing anything again.
• Visible start pass: Only when no start was accepted and no stop signal is present, confirm the plug, select the intended drying program, clear a documented delay or control lock, and press Start/Pause once.
• Door and stopped load: Remove only laundry caught at the opening, close the door without force, and reduce a visibly overpacked load.
• Evidence: Record whether that one attempt produced silence, a click, a hum, scraping, or any drum movement.

What Not to Do and When to Stop

• Do not open the cabinet, bypass the door switch, or run live-voltage tests.
• Do not force the drum or repeatedly restart a humming machine.
• Do not order a belt, motor, roller, or control from the symptom alone.
• Disconnect the dryer and do not try it again for a hum without rotation, metal scraping, a hot electrical or rubber odor, smoke, visible damage, water near electrical areas or a repeated breaker trip.

What Diagnosis Must Confirm

A repair diagnosis should prove whether the control accepted the start command, whether the door input is stable, whether the drum and supports rotate without abnormal mechanical load, whether the exact belt/tension path is intact, and whether the motor receives and converts the commanded output into rotation. Stored faults and wiring must be checked against the exact E-Nr documentation before a part is condemned.

What to Record Before Service

• Identity: Full E-Nr and FD, including the suffix.
• Start state: Display, selected program and whether Start/Pause changed anything.
• Movement: Whether the drum never moved or stopped after beginning.
• Sound: Silence, click, hum, scrape or earlier rhythmic noise.
• Safety event: Odor, smoke, leak, visible damage or breaker trip.