Question about Whirlpool Microwave Ovens

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My whirlpool microwave heats up the top cover / outer metal casing. It seems to get hotter and hotter, even though the food inside may not be all that hot. Eventually it may even stop running the magnetron. Thing is, it is clean, has airflow out the back, and did this more or less from new. So it works, but doesn't heat as quickly as many others I have seen, and seems to soak some microwave energy into the casing. Any ideas?

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  • kim4468 Jul 13, 2008

    Hi, thanks for the quick response.



    It is not a cooling fan issue - that is running. I will do the heating test once I have a thermometer. Interesting thing to me is that the microwave definitely heats itself (i.e. outer casing) while it cooks. It is not a simple heat flow from hot food to casing, as it gets hot on top only. It has a grill, which I don't use, and isn't on, but could it be food-spatter / carbon in that area that absorbs microwave energy? I will continue investigating.



    Thanks again.

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  • Whirlpool Master
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If the cooling fan is not running, then that definitely needs to be addressed to prevent magnetron damage.

-.htmThere should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

-.htmYou can usually find helpful exploded view diagrams and order parts by entering your full model number here.

It might be useful to first do a standard heat test.

-.htmMICROWAVE HEATING POWER TEST

The following test will provide a suitably accurate measurement of the output power of any microwave oven. Variations or errors in performing this test will produce uncertain results. If the line voltage (from the electrical outlet) is low, the magnetron output will be correspondingly low.

Equipment needed:

- Microwave safe container with 1000 mL (1 Liter) gradation.

- Fahrenheit or centigrade thermometer

Procedure:

Pour exactly 1000 mL (1 Liter) of cool tap water into the container. Using the thermometer, stir the water, then measure and record the temperature. For accurate results the water should be about 60 degrees F (20 degrees C).

Place the container on the center of the oven cooking shelf (do not leave the thermometer in the container and remove any metal racks), and heat the water (at full power) for 63 seconds. Use the second hand of a watch, not the oven timer.

After the heating time is completed, immediately remove the container, stir the water, re-measure and record the temperature of the heated water.

Subtract the starting water temperature (step 2) from the ending water temperature (step 3) to obtain the temperature rise.

To determine the output power in watts, multiply the total temperature rise by a factor of 38.75 if you're using a Fahrenheit thermometer or 70 if you're using a centigrade thermometer.

-.htmWe're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jul 12, 2008

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