Step-by-Step DIY Fix Guide
- SAFETY: Unplug the dryer from the wall outlet.
- Check that the drum rotates freely by hand (with the door open and power off).
- If the drum does not turn freely, the belt may have snapped — call a technician.
- Reset by unplugging for 30 seconds, then restoring power.
- If E28 returns, call Bosch Customer Support at 1-800-944-2904.
If the warning comes back after restart
- If airflow still seems weak after the basic checks, the fan path or a deeper obstruction becomes more likely.
- If the warning returns immediately after a clean restart, the sensor or wiring path becomes more likely than a one-time glitch.
- Any recurrence after power reset — E28 always requires professional repair
What This Error Means
Error E28 on your Bosch dryer means: The dryer has detected a fault in the motor speed sensor (tachometer). This sensor monitors drum rotation speed and reports to the control board. The machine's self-diagnostic system has detected this condition and stopped the current cycle to prevent further damage or unsafe operation.
The most frequent cause is failed motor speed sensor (tachometer/hall sensor). Work through the causes listed below in order — starting with the simplest and most accessible.
Bosch's official guidance classifies E28 as a technician-only fault. The components involved require electrical testing equipment and safe internal access. Contact Bosch Customer Support at 1-800-944-2904.
Electronics faults prevent the dryer from operating safely and the machine is right to stop. A 30-second power reset resolves occasional transient faults. If the code returns, the component needs physical diagnosis — there is no further DIY path.
Most Likely Cause by Symptom
The Bosch dryer may stop, pause, or refuse to complete the cycle normally.
Likely cause: Failed motor speed sensor (tachometer/Hall sensor)
Check first: SAFETY: Unplug the dryer from the wall outlet.
The warning may return immediately because the appliance is detecting an internal fault.
Likely cause: Worn or broken drive belt causing the drum to stop rotating
Check first: Check that the drum rotates freely by hand (with the door open and power off).
Common Causes
- Failed motor speed sensor (tachometer/Hall sensor)
- Worn or broken drive belt causing the drum to stop rotating
- Motor winding failure reducing or stopping rotation
- Wiring fault between motor sensor and control board
What Not to Do
- Do not force a drum that won't turn freely — the drive belt may be broken
Model and Display Variation Notes
Model-family notes
- Bosch dryer display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Service option
Bosch service visit if the warning returns after the basic checks are complete.
Manual and model check
Check your exact model and manual before ordering any Bosch dryer parts.
Common parts
- Drive belt ($10–$30)
- Motor speed sensor/tachometer ($20–$50)
- Drive motor ($80–$180)
This section stays service-first because the page points more strongly toward support or professional repair than a routine parts purchase.
When Not to Keep Troubleshooting
Any recurrence after power reset — E28 always requires professional repair
How to Prevent It Recurring
- Clean the lint filter after every cycle to reduce motor strain from restricted airflow
- Do not overload the dryer drum — excess weight stresses the drive belt and motor
Related Error Codes
E09
The dryer has detected an electronics fault in the main control unit. The control board manages all dryer functions and has reported a critical error.
E08
The dryer has detected an electronics fault in the NTC (negative temperature coefficient) sensor circuit. The NTC sensor monitors drum or exhaust temperature to control the heating cycle.
Extra notes
- This page is based on Bosch support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-07
Based on: Based on Bosch support material and edited into consumer-safe guidance for the exact code family on this page.
Model coverage note: Bosch dryer code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.