Error Code: E21 Difficulty: Moderate
Problem: Control module failure; Fault with the dryer’s electronic components
How to Fix E21 Error (Step-by-Step)
- Turn the dryer off, unplug it from the power source, wait for a few minutes, and then plug it back in to reset the electronics.
- If the error persists after a power cycle, professional service is required to diagnose and replace the control module.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
- Check for simple blockages (lint screen, drain path, or filter) and clean anything you find.
- Make sure all doors, lids, and hoses are fully closed and seated correctly.
- Run a short test cycle to see if the error clears.
- Stop the cycle if the same error comes back right away, and avoid repeated restarts.
Recommended Replacement Part
What to Check Next on This Bosch Dryer
Use these checks before ordering parts for Bosch dryer E21. They keep the diagnosis tied to the appliance instead of turning the page into a reset-only guide.
- Unplug the dryer before touching the lint housing, rear vent, lower service area, or any wiring.
- Clean the lint screen, moisture sensor bars, condenser area if equipped, and the full vent path so airflow problems do not imitate part failures.
- Run a short timed cycle with a light load and note whether the fault appears immediately, after heating starts, or near the end of the cycle.
- If the fault returns with clean airflow, inspect the part categories below using the full model number from the dryer tag.
- Stop repeated test cycles if you smell heat, see moisture near electrical areas, or hear grinding from the drum drive.
- 00661229
- 00631326
- 481590
Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.
More options (for a better recommendation)
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Expert: Mike Sullivan
EPA Section 608 Certified Technician with 18+ years experience.
Read Editorial Standards →When It’s Better to Replace Than Repair
Dryer repairs are often worth it for small parts, but repeated heating, motor, drum, or control failures can point toward replacement.
Confirm gas vs electric, venting, voltage, doorway clearance, and laundry-space dimensions before ordering.
For repair parts, verify exact fit with the full dryer model number before buying; these links are general replacement-appliance shopping options.
- [OK]Thermal fuse or heater failures keep returning
- [OK]Belt, roller, or motor repairs exceed unit value
- [OK]Door switch or control issues stack with other faults
- [OK]Older dryer has long dry times even after vent cleaning
Recommended Dryer Replacement Options
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