Bosch
All Bosch Microwave Error Codes
Every known Bosch microwave error code with plain-English explanations, difficulty ratings, and step-by-step DIY fix guides.
10 error codes
E01
The magnetron has overheated and the protection circuit has activated.
Advanced Fix
30–60 minutes
E02
The oven cavity temperature sensor has failed.
Advanced Fix
30–60 minutes
E04
The door switch circuit is not functioning correctly.
Advanced Fix
30–60 minutes
E08
The inverter board that controls microwave power has failed.
Professional Required
Professional service required
E3
There is a problem with the door opening or closing mechanism.
Moderate
10–20 minutes
E11
The humidity sensor is malfunctioning or sending incorrect readings.
Easy Fix
5–15 minutes
Er4
Dangerously high temperatures detected inside the microwave cavity.
Professional
Varies
Er11
One or more buttons on the control panel are dirty or mechanically jammed.
Easy Fix
5–10 minutes
Er18
A general technical fault has been detected in the microwave's electronics.
Professional
Varies
E723
The microwave detects the door is not securely closed.
Easy Fix
5–10 minutes