⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.
Error Code: KEY SYMBOL Difficulty: Easy
Problem: The childproof lock is activated, locking the control panel.
How to Fix KEY SYMBOL Error (Step-by-Step)
- Identify the key symbol on the display, which indicates the childproof lock is active and the controls are locked.
- Locate the button or buttons used to activate and deactivate the child lock. This is often indicated by a small key icon next to a button.
- Press and hold the designated button (often the ‘Finished in’ or ‘Time Dry’ button) for approximately 3-5 seconds.
- Watch the display for the key symbol to disappear, which confirms the control panel is now unlocked.
- You can now operate the dryer normally by selecting a program and pressing ‘Start’.
- To reactivate the child lock, repeat the process of pressing and holding the same button for 3-5 seconds until the key symbol reappears.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.
Most DIY parts are $50–$250. If you have a quote, use the total.
More options (for a better recommendation)
⚡ Don’t Risk a DIY Fail!
Get the ‘Secret Service Mode’ Cheat Sheet for your Bosch model. Includes an easy-to-read list of every error code and quick diagnostic tips.
✅ Join 15,000+ DIYers • Instant PDF Download
Browse More Codes
📖 View All Error Codes
Expert: Mike Sullivan
EPA Section 608 Certified Technician with 18+ years experience.
Read Editorial Standards →Browse all Bosch error codes: Bosch Error Codes


Leave a Reply