Microwave Diagnostics

Bosch Microwave
Error Codes

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

Enter the code shown on your microwave 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

ER11 ER1 ER4 E11 E17 E3 E2

All Codes

E2 E3 E11 E17 ER1 ER4 ER11

Error Code Directory

Click any code for detailed troubleshooting steps

Low Medium High

Code Meaning Severity Common Symptom

E2 Auto Safety Shutoff Medium The microwave shuts itself off partway through a cooking cycle and displays E2. View E3 Door System Malfunction Medium The microwave door doesn't latch shut or won't release when pressing the open button. View E11 Moisture in Controls Medium Pressing buttons produces unexpected results or multiple inputs register. View E17 Preheat Failed Medium The microwave attempts to preheat in convection mode but never reaches the set temperature. View ER1 Temp Sensor Faulty High Convection cooking doesn't maintain the set temperature — food burns or stays raw. View ER4 Extreme Overheating High Visible smoke or a strong burning odor from the microwave cavity or vents. View ER11 Button Jammed Low One button on the control panel feels stuck or doesn't spring back. View