Bosch Dryer: error code F:03
What is this symptom?
If your Bosch dryer displays the error code F:03, it indicates a drainage issue related to condensation. This often happens due to a blocked or kinked drain hose, a clogged sump, or a malfunctioning condensation pump. When this error occurs, the dryer will stop running to prevent further damage. Resolving this issue promptly can restore your dryer's functionality and prevent costly repairs.
Important Tips for Bosch Models
- Bosch documentation lists similar codes (E03) as condensation drainage hose blocked or kinked, recommending hose check/cleaning
Possible Causes
Blocked or kinked condensation drain hose preventing water removal
How to Identify: Error appears when water is not draining; hose bent, crimped, or clogged with lint/debris
Part: condensation drain hose
Clogged condensation sump or drain path inside dryer
How to Identify: Cleaning external hose does not fix error; water remains in sump area
Part: internal drain pan/sump
Condensation pump failure
How to Identify: No water being pumped even when drainage path clear; error persists after cleaning hose
Part: condensation drain pump
DIY Solutions
Clean and clear the condensation drain hose
- Unplug dryer and pull it forward
- Locate condensation drain hose at rear and check for kinks
- Detach hose and blow air/compressed air or brush through to clear lint/debris
- Reinstall hose straight without sharp bends
- Plug in and test dryer
- Run short cycle to verify F:03 no longer appears
Deep clean internal condensation path and sump area
- Unplug dryer and remove access panels (top/front per model)
- Locate internal condensation sump and drain path
- Vacuum out lint and debris from sump and nearby areas
- Ensure drain outlet from sump to hose is clear
- Reassemble panels and reconnect power
- Test dryer with an empty load
Next step
Choose the next step for error code F:03
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Drain Hose
Carries waste water from the drain pump to your home's standpipe or sink drain.
- Typical part-only price
- $15 - $30
- DIY difficulty
- Easy
- Estimated time
- 15-30 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Dryer parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Dryer Vent Cleaning Kit
Helps remove routine lint buildup from an accessible dryer vent path. It does not diagnose or repair an E-code or failed component.
Lint Trap Cleaning Brush
A narrow brush for routine cleaning around an accessible lint screen and housing.
Dryer Vent Hose Kit
A replacement exhaust duct option for visibly crushed or damaged external venting. Check diameter, length, local code, and installation clearance.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Professional Repairs
Replace condensation drain pump
Technician internal inspection and repair
When to Call a Professional
Preventive Maintenance
-
Regularly clean condensation drain hose and sump: F:03 drainage blockage errors
Frequency: every 3–6 months -
Clean lint filters after every cycle: excess lint entering internal paths and drainage system
Frequency: after each use
Frequently Asked Questions
Why is my Bosch Dryer error code F:03?
How do I fix Bosch Dryer error code F:03 myself?
How much does it cost to fix error code F:03?
When should I call a technician for error code F:03?
References & Sources
- Bosch Dryer Error Codes Overview Official
Community Analytical Insights
Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions
Common Issues Reported by Users
- Blocked venting system causing overheating
- Faulty temperature sensor malfunction
- Defective control board or wiring issue
User Suggested Solutions
-
Inspect and clean the venting system. Disconnect the dryer from power, remove the vent hose, and check for lint buildup. Clean the duct thoroughly and reattach.
-
Test the temperature sensor using a multimeter. If it shows a reading outside the normal range (typically 10k ohms at room temperature), replace it.
-
Inspect the control board for visible damage or burnt components. If found, replace the control board. If no visible damage, check wiring connections for loose or damaged wires.
Limited-source guidance; percentages and success-rate claims are not shown
View
Sources
Data compiled from real discussions on r/appliancerepair and r/Appliances:
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