Official Bosch microwave parts

Common replacement parts for Bosch microwaves

• Magnetron. The magnetron generates the high-energy radio waves that heat food in the microwave. When the microwave won't heat, a failed magnetron could be causing the problem. Diagnosing and replacing a magnetron are tasks that should only be performed by a service technician. Microwaves have high-voltage capacitors in their control systems that retain a lethal electrical charge even when the microwave is unplugged from the electrical outlet. Have a service technician diagnose and repair your Bosch microwave when it's not heating.
• Light bulbs. Replace the interior light bulb and cooktop light bulbs by following the directions in the owner's manual for your Bosch microwave.
• Door handle. The door handle can eventually wear out or get damaged because it sees such frequent use. Although replacing a microwave door handle seems like a simple repair, the procedure is often somewhat complicated because you need to remove shielding to access door handle screws. The microwave shielding should be tested for leakage after replacing the door handle. Because you likely won't have the testing equipment needed to check the shielding for leakage, you'll likely need to have a service technician replace the door handle when it breaks.
• Door switches. Door interlock switches prevent the microwave from starting when the door is open. These switches should be replaced and tested by a service technician to make sure the microwave operates safely.

How to troubleshoot your Bosch microwave when it won't power up

Check the power cord. Make sure the power cord is plugged into a working electrical outlet. Check the electrical outlet for power by plugging a night light or small appliance into the outlet. If the outlet is dead, reset the house circuit breaker for the outlet. Check the power cord for damage and replace the power cord if it's torn or frayed.

If the power cord is good and the electrical outlet works, then a failed electronic control board or a blown fuse inside the microwave could be preventing the unit from powering up. These types of failures should be diagnosed and repaired by a service technician because accessing internal microwave components can expose you to the high-voltage capacitor which retains a lethal electrical charge even when the microwave is unplugged.