Is it safe to run a microwave without food in the cavity?

Running a microwave with no load can cause serious damage to electrical components. When food is placed in the oven, microwave energy generated by the magnetron is absorbed by the food. When no food is in the oven, there is nothing to absorb the energy. The energy bounces around the cavity and is channeled back through the waveguide. This can cause arcing, fire and may burn out the magnetron.

Posted in: Microwave Safety