Bosch Oven: fan not turning off

Professional Repair Guide

What is this symptom?

Is your Bosch oven's fan running continuously, even after the oven is turned off? This issue may stem from normal cooling cycle operation or, less commonly, blocked ventilation. If the fan doesn't shut off after a reasonable time, troubleshooting is essential to restore proper function.

Urgency: Medium

Important Tips for Bosch Models

  • Bosch ovens use a designed cooling fan that runs after cooking; long durations especially after high heat or self‑clean cycles can be normal.
  • Bosch models may use variable speed fans and sensors — motor/sensor faults can cause erratic nonstop operation.

Possible Causes

Normal cooling cycle operation

How to Identify: Fan runs for a period then stops without other issues.

Part: Cooling fan / convection fan

Blocked ventilation / restricted airflow

How to Identify: Extended cooling beyond normal; vents blocked by cabinetry or items on oven; high ambient temps.

Part: Vent system

DIY Solutions

Observe normal cooling cycle

Easy Up to 60 minutes
  1. After shutting oven off, wait and monitor fan operation for up to ~30–60 min.
  2. Determine if fan eventually stops as internal temp drops before investigating further.
⚠️ Safety First: No internal access needed.

Power reset (hard reset)

Easy 10 minutes
  1. Turn off oven’s circuit breaker for ~5–10 minutes.
  2. Restore power and observe if fan shuts off normally.
⚠️ Safety First: Ensure breakers are handled carefully.

Inspect and clean vents

Moderate 15–30 minutes
Tools Needed: Screwdriver if needed for vent access
  1. Ensure vents are not blocked or obstructed by objects or debris.
  2. Clean visible dust/grease ensuring clear airflow around rear/top vents.
⚠️ Safety First: Do not insert objects while power is connected.

Professional Repairs

Temperature sensor replacement

Estimated Cost: $30 - $100 (parts only)

Control board/ relay replacement

Estimated Cost: $150 - $400

Fan motor assembly replacement

Estimated Cost: $100 - $300

When to Call a Professional

Fan runs continuously for hours/days without stopping
Fan makes unusual mechanical noises or vibrates
DIY diagnostics (sensor test, reset) do not stop issue
Internal parts inspection or replacement required

Preventive Maintenance

  • Keep vents clear and clean: Excessive cooling fan run time due to restricted airflow
    Frequency: Monthly
  • Occasional oven internal cleaning: Heat retention from grease/debris leading to longer fan operation
    Frequency: Every few months

Frequently Asked Questions

Why is my Bosch Oven fan not turning off?
The fan may be operating in a normal cooling cycle or could be obstructed by blocked ventilation.
How do I fix Bosch Oven fan not turning off myself?
Wait to see if the fan stops after 30-60 minutes, perform a power reset, or clean any blocked vents.
How much does it cost to fix fan not turning off?
Professional repairs range from $30 for a temperature sensor to $400 for control board replacement.
When should I call a technician for fan not turning off?
If DIY solutions fail or if you suspect a more complex issue, it's best to consult a professional.

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: Professional

Common Issues Reported by Users

  • Faulty control board malfunctioning and sending continuous power to the fan
  • Stuck fan relay that fails to open and cut power to the fan
  • Temperature sensor issues causing the fan to run longer than necessary

User Suggested Solutions

  1. Inspect the control board for any visible damage or burnt components. If damaged, replace the control board.

  2. Check the fan relay for proper function. If it is stuck, replace the relay.

  3. Test the temperature sensor with a multimeter. If it shows incorrect readings, replace the sensor.

Analysis based on 1 community discussions
View Sources

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

  1. Bosch range convection fan won’t turn off?

Community Discussions

convection fan won’t turn off

Resetting the circuit breaker stopped the fan; potential control board issue.

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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