Cooktop Diagnostics

Bosch Cooktop
Error Codes

Meanings, severity levels, safe checks you can perform, and when to call a technician.

Enter the code shown on your cooktop display

Is it safe to keep using it?

Depends on code severity. Low/Medium codes often allow continued use, High severity requires immediate stop.

Can error codes be reset?

Some codes clear after power cycle. Persistent codes indicate underlying issues needing repair.

When should I stop using it?

Stop immediately for water leak codes, burning smell, or any High severity error.

Most Common Codes

F8 U400 F5 F6 F4 F1 F2 E9000

All Codes

E9000 F1 F2 F4 F5 F6 F8 U400

Error Code Directory

Click any code for detailed troubleshooting steps

Low Medium High

Code Meaning Severity Common Symptom

E9000 Incorrect Supply Voltage High No zones respond, no lights, no display — the cooktop is completely dead. View F1 Zone Overheated Medium A single cooking zone turns off automatically while other zones continue working. View F2 Electronics Overheated Medium A specific zone fails while others continue to function normally. View F4 All Electronics Overheated High All zones go dark simultaneously. No cooking zone will respond. View F5 Cookware Near Controls Low A cooking zone shuts off when a hot pot or pan is moved near the control area. View F6 Zone Heat Limit Medium The zone powers down when used at maximum setting for an extended time. View F8 Auto Time Limit Low The zone shuts off after 1-10 hours (varies by power setting) without any user input. View U400 Voltage Out of Range High Zones flicker between power levels or turn on and off unpredictably. View