Error Code: F42 Difficulty: Hard
Problem: Issue with the carbon brushes in the motor.
How to Fix F42 Error (Step-by-Step)
- Disconnect the dryer from the power source and confirm the error stays cleared during a full test cycle.
- Remove the necessary panels to gain access to the dryer’s motor.
- Locate the carbon brushes on the motor housing and confirm the error stays cleared during a full test cycle.
- Disconnect the electrical leads attached to the brushes and confirm the error stays cleared during a full test cycle.
- Remove the screws or clips holding the old carbon brushes in place and remove them.
- Insert the new carbon brushes and secure them and confirm the error stays cleared during a full test cycle.
- Reconnect the electrical leads and reassemble the dryer and confirm the error stays cleared during a full test cycle.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
Recommended Replacement Part
What to Check Next on This Bosch Dryer
Use these checks before ordering parts for Bosch dryer F42. 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.
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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
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