Bosch Dryer: not starting

Professional Repair Guide

What is this symptom?

If your Bosch dryer won't start, it may be frustrating. You might notice that pressing the Start button results in no drum movement or response, even though the dryer is plugged in. This issue can stem from several common causes, including power supply problems, a faulty door switch, or a blown thermal fuse. Understanding these factors can help you troubleshoot effectively.

Urgency: Medium

Important Tips for Bosch Models

  • Bosch official guidance emphasizes checking power, door closure, and correct program selection before any internal repairs.

Possible Causes

Power supply or basic setup issue

How to Identify: Dryer shows no lights or display, no response when Start is pressed; other devices in the same outlet also have no power.

Part: Power cord / outlet / breaker

Door latch/door switch not engaged or faulty

How to Identify: Dryer displays no start, and pressing door firmly until a click sometimes allows start; multimeter continuity of switch fails.

Part: Door switch / latch

Blown thermal fuse

How to Identify: Dryer has no power to motor even when door and settings are correct; multimeter shows no continuity at the thermal fuse.

Part: Thermal fuse

Faulty start switch

How to Identify: No sound or response when pressing Start button; multimeter test shows no continuity when switch is pressed.

Part: Start switch

Control board malfunction

How to Identify: All basic checks pass but dryer still doesn’t start; visible board damage or no voltage output to motor.

Part: Control board

Drum belt or belt switch issue

How to Identify: Dryer makes no movement; belt broken or idler pulley problem evident; some models have belt switch that kills start if belt is broken.(Repair Clinic

Part: Drive belt / belt switch

DIY Solutions

Verify power and basic settings

Easy 5-10 minutes
  1. Confirm the dryer plug is fully inserted into a live outlet.
  2. Test the outlet by plugging another device into it.
  3. Check and reset the circuit breaker or replace a blown fuse if needed.
  4. Ensure a drying program is selected and child lock / delayed start functions are disengaged.
⚠️ Safety First: Do not plug dryer into extension cords or power strips.

Check and adjust door latch/switch

Moderate 10-20 minutes
Tools Needed: Screwdriver, multimeter
  1. Open and close the dryer door firmly to ensure it latches completely.
  2. Listen for audible click on latch engagement.
  3. Unplug dryer, remove access panel and test the door switch for continuity with a multimeter.
  4. Replace the door switch if it has no continuity when the door is closed.
⚠️ Safety First: Always disconnect power before accessing internal components.

Test and replace thermal fuse

Moderate 20-40 minutes
Tools Needed: Screwdriver, multimeter, replacement thermal fuse
  1. Unplug dryer and remove rear or access panel to locate thermal fuse.
  2. Use a multimeter to test continuity of the thermal fuse.
  3. If no continuity is present, replace the thermal fuse with correct rating.
  4. Reassemble and test dryer operation.
⚠️ Safety First: Thermal fuse indicates possible airflow issues; inspect venting to prevent repeated failures.

Professional Repairs

Replace Start Switch

Estimated Cost: $30 - $90

Control Board Diagnostics and Replacement

Estimated Cost: $150 - $400

Drive Belt and Idler Pulley Replacement

Estimated Cost: $40 - $120

When to Call a Professional

Internal electrical issues beyond DIY testing
Control board suspected faulty
Burning smell or smoke
Water damage or significant internal damage

Preventive Maintenance

  • Clean lint filter: Vent blockage and overheating leading to fused thermal fuses
    Frequency: after every use
  • Inspect and clean exhaust vent: Overheating and blown thermal fuse
    Frequency: annually

Frequently Asked Questions

Why is my Bosch Dryer not starting?
Common reasons include power supply issues, a faulty door switch, or a blown thermal fuse.
How do I fix Bosch Dryer not starting myself?
Check the power supply, ensure the door latches properly, and test the thermal fuse for continuity.
How much does it cost to fix not starting?
Professional repairs for a Bosch dryer not starting typically range from $30 to $400 depending on the issue.
When should I call a technician for not starting?
If basic troubleshooting fails or if issues like control board malfunction arise, it's time to call a technician.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

50%
DIY Success Rate Difficulty: DIY

Common Issues Reported by Users

  • Motor issues (kill switch, belt) (1 mentions)

User Suggested Solutions

  1. Press the motor kill switch after removing the belt

    Success rate: 25.0%
Analysis based on 3 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Bosch - Nexxt 500 Series Dryer - Does not start/engage drum-...
  2. Bosch vision dryer won't start, no error displayed.
  3. Bosch Nexxt 500 dryer replacement parts?

Community Discussions

dryer won't start, no error displayed

The motor had a kill switch that needed to be pressed after removing the belt.

DIY View on Reddit →

won’t start

Issue with the door switch.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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