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Whether or not it’s safe to use a buzzing microwave depends on what’s causing the noise. If a loose fastener or a dirty cooling fan is the underlying issue, it’s safe to use your microwave, although you may do damage to the fan motor if you don’t clean the blades first. If the issue is stemming from something else, you could do further damage to your appliance and potentially even start a house fire if you don’t repair it before continued use. If the microwave is buzzing when not in use, shut the power and call an emergency electrician, as this could lead to a fire.

It's good to contact the manufacturer first to see if any warranties still exist, and if they have any specific repair persons they recommend. Some specialty units or smart units may require the assistance of a manufacturer-approved technician. Oven issues can be more challenging to diagnose than other appliances in the home because many of the parts are difficult to access for inspection or replacement. Some common oven repairs involve replacing damaged burners, heating coils, or electric cables. Purchasing additional parts, such as a new heating coil may also increase the total repair cost. 

The magnetron, which is the component that generates the microwave energy used to heat your food, is the most likely piece to cause your appliance to fail. Unfortunately, your microwave won’t serve any purpose without a functioning magnetron, so not only is this the most common repair, but it’s also the most important. 

Repairing a broken magnetron usually costs between $100 and $200 or $175 on average. About half of that cost goes toward labor, and the other half is for a new magnetron. Higher-end microwaves may demand larger or more complex components, which could increase your repair cost.

A microwave can last anywhere from five to 10 years. To get the most out of this appliance, you should follow a few maintenance tips:

• Immediately clean up spills and food bits. To help with stuck-on food, heat a bowl of water with ¼ cup of lemon juice for one minute.

• For over-the-range microwaves, clean the grease filter that’s underneath it. This will ensure the microwave runs efficiently.

• Never put anything metal in the microwave, as it can create a fire hazard. Also, avoid dishes with metal trim for the same reason. 

• Avoid slamming the door. With years of use, the door switches could easily break.