Dear Management

We are supplying these TIP SHEETS in an effort to minimize catastrophic failures of your commercial microwave ovens.

Microwave Ovens are, for the most part, a misunderstood piece of equipment in the way they work as well as how they heat food. In many ways this is why commercial microwaves fail to perform after years of use.

Please affix this sticker to the upper
left corner of the window.
tips sticker

All commercial microwave ovens have to be maintained. This is simply a routine cleaning at the end of each day. Do not use commercial oven cleaners, abrasives or harsh cleansers. The easiest way to clean the oven cavity is to steam up the interior cavity, which loosens up all the foreign matter. To do so, use a large microwavable container filled to one third with water and heat for about five minutes on HIGH power. Carefully remove the boiling water and simply wipe out the cavity with a clean moist cloth.

The plastic shield in the top of the cavity is a stirrer cover. This is where microwave energy comes from. This shield protects the stirrer mechanism from foreign matter splattering on to it and causing damage by arcing. This cover is easily removed by either thumbscrews or thumb tabs, and should be wiped clean as needed.

Panasonic and Sharp commercial microwaves have a ceramic shelf which has silicon molding around the edges. This creates a tight seal to prevent liquids from seeping under the shelf. After time and use, this seal can be damaged. We have witnesses where some kitchen help will try to clean the shelf with a metal spatula, tearing the silicon seal and allowing foreign matter to seep underneath. This can lead to arcing, which is terminal "cancer." Using a butter knife or similar, pry this shelf up starting in the middle of the front edge. Be careful as this shelf is about $90.00. (Try steaming the cavity first to loosen the seal). Wipe out any foreign matter.

The air filter, which is usually accessible near the bottom front oven should be cleaned periodically. Just rinse with water. We do not recommend putting these through a commercial dishwasher for fear of losing or destroying the filter.

To better understand the inner workings of a commercial microwave oven we are showing the explored view below of a typical microwave oven. Most commercial models feature dual magnetrons, which are connected to wave guides delivering the microwave energy to the stirrer systems. One delivering microwave energy from the top of the cavity and one on the bottom. Please note the bottom stirrer assembly, which is located under the ceramic shelf, is where there's greater concern for arcing due to foreign matter that might seep through the seals of the ceramic shelf which will in turn cause arcing which is usually fatal.


Please feel free to get in touch if we can be of further assistance.

Best Regards,

Jim Stratton
Microwave Specialties




8671 Cherry Lane
Laurel, Maryland 20707

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