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Appliance Fix Guide

Bosch Dryer error code

Bosch Dryer Error F42

Issue with the carbon brushes in the motor.

Issue with the carbon brushes in the motor.

Updated Aug 18, 2026
✅ WORTH FIXINGParts under $100
Bosch dryer repair guide for error F42
Error codeF42Dryer

Try these first

Start here before buying a part or taking the appliance apart.

  1. 1
    Check 1

    Verify the dryer is plugged into a dedicated circuit and check your home's circuit breaker.

  2. 2
    Check 2

    Reset the electronics by turning the dryer off and unplugging it for a few minutes.

  3. 3
    Check 3

    Inspect the dryer's power cord for any signs of physical damage.

A quick explanation

What does F42 mean?

Issue with the carbon brushes in the motor.

The answer you came for

How to fix Bosch dryer error F42

Start with the safest checks and work from simple to technical.

  1. 1

    Step 1

    1. Disconnect the dryer from the power source.

  2. 2

    Step 2

    2. Remove the necessary panels to gain access to the dryer's motor.

  3. 3

    Step 3

    3. Locate the carbon brushes on the motor housing.

  4. 4

    Step 4

    4. Disconnect the electrical leads attached to the brushes.

  5. 5

    Step 5

    5. Remove the screws or clips holding the old carbon brushes in place and remove them.

  6. 6

    Step 6

    6. Insert the new carbon brushes and secure them.

  7. 7

    Step 7

    7. Reconnect the electrical leads and reassemble the dryer.

Read the additional checks from the current guide

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.

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.

If the code comes back

Do not keep replacing parts based only on the code. Repeat the safe checks above. If the fault remains, stop and arrange qualified service rather than ordering from the code alone.

What may be causing it?

  • Inadequate power supply
  • Tripped circuit breaker
  • Damaged power cord
  • Internal fault in the main control board

These are possibilities to investigate, not proof that one part has failed.

Recommended part

Recommended part for this error code

Main Control Board

Price noted in the current guide: $10-$77

Why this part is shown: It is associated with Bosch Dryer error F42 in the current guide. The error code alone does not prove this part has failed.

Compatibility varies by model. Confirm that the Amazon listing includes your complete dryer model number before ordering.

Amazon part link View recommended part on Amazon

You can open the recommendation now. Check model compatibility on the Amazon page before purchasing.

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Replacement options

Ready to replace your dryer?

If repairing this dryer no longer feels worthwhile, compare three replacement paths below.

Why shop your replacement on Amazon?

  • Fast, free delivery

    Prime members can get fast, free delivery on eligible items.

  • Convenient delivery options

    Select large appliances may offer scheduled or Room of Choice delivery.

  • Haul-away options

    Haul-away may be available for select appliances and delivery areas.

  • Installation help

    Installation or assembly may be available on select items.

Delivery and service options, fees, and availability vary by item, seller, and delivery ZIP code. Confirm available services at Amazon checkout.

Affiliate disclosure: qualifying purchases may earn this site a commission at no additional cost to you.

Make the money decision

Repair or replace calculator

Use the age and total repair estimate to get a simple comparison. This is guidance, not a guarantee.

Safety first

Disconnect power before opening panels or touching internal parts.

When to stop
  • Stop if you see burned wiring, melted connectors, water near electrical parts, or a gas smell.
  • Do not perform live-voltage testing unless you are trained and equipped for it.
  • Use the exact model manual or service information before replacing electronic controls.

Free quick sheet

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