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Appliance tip of the week.

2 common Microwave issues discussed below...

I set something on fire in my microwave and now it is dead...help!

Microwave Thermostat

Most microwaves today have a flame-oven thermostat-safety built into them. This oven thermostat will open up ( no continuity ) when something has been overheated or set on fire in the oven. An example of where the flame-oven thermostat is in an over the range micro, usually the thermostat for the oven is on the top area....

microwave diagram

Click on the picture for a larger view

The flame-oven sensor-thermostat is suppose to be closed ( full continuity ) all the time and will open up ( no continuity ) when needed, like when something like a small fire in the oven occurs.

A wiring diagram showing where the flame/oven thermostat may be.

A sample picture of a couple different flame/sensor thermostats.

Sparks from inside the oven area....why?

Q - When there is small amounts of food in the oven, arcing occurs right behind the plate where the wave guide comes into the oven. Sometimes it works well and sometimes you can't even put in a bag of popcorn. Any ideas? Could food have 'dripped' in here and be causing a microwave short?

A - Yes! Food splatter or drips can continue to cook and will carbon over creating sparks/arcs from the wave guide cover. Usually can clean up the food on and under the wave guide cover, if the oven liner has been damaged we usually lightly sand and touch up those marks with touch paint. Do not let it go for too long as damage to the magnetron end is possible as well :( If the wave guide cover has been damaged, replace it!

A couple example of wave guide covers....

plastic cover

Plastic

mica cover

Micaboard