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Over the Range Microwave went dead while exhaust fan only was running. No power at all going to unit. Control

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  #1 (permalink)  
Old 12-11-2007, 05:14 PM
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Default Microwave Stumper - No Power
Model Number: MH6151XHT-1   Brand: Whirlpool   Age: 5 - 10 years   

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Over the Range Microwave went dead while exhaust fan only was running. No power at all going to unit. Control board has no function working or showing signs of power. In the inside of the computer control panel there is a wiring diagram, and based on the wiring and testing criteria; the thermal fuse, capacitor, diode, fan motor, and on the transformer, the primary and filament wiring test ok. I didn't test the secondary wiring of the transformer, as it is covered with a tape protective covering.

There is a MGT THERMAL FUSE shown in the wiring diagram, but I can't find it. Could that be the issue?

The secondary switch didn't doesn't appear to make contact with the door, so I held the switch down, and still no power to the unit. This might be an auxillary problem.

Is it possible that the $175 control board is dead? How do I test it for sure?

Any other ideas?

This one has been a learning experience for me, as this isn't my cup of tea. This board has been very helpful, and I hope someone can help me.


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  #2 (permalink)  
Old 12-11-2007, 07:33 PM
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Did you check the line fuse?

Did you check the power outlet for 120V?

The magnetron thermal cut off is mounted to the magnetron.

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Old 12-11-2007, 07:50 PM
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I was cooking Oatmeal this morning. after 20 seconds, the 6 year old GE emo3000cbb lost all power. The is still power at the plug. any Ideas?
signed,
cold oatmeal
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Old 12-11-2007, 08:00 PM
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The first thing I would do is check the line fuse.

- Here are the break down diagrams for the GE microwave Model EMO3000CBB02

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Old 12-12-2007, 11:30 AM
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In my post, it incorrectly states that I checked the thermal fuse. I checked the line fuse, and it shows continuity. From the plug to just before the line fuse where it connects to the case reads 120V.

Any other ideas???

TM
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Old 12-12-2007, 11:45 AM
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TM

Did you check the cavity thermal cut off (#7 on the interior break down diagram)?

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Old 12-12-2007, 05:11 PM
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thanks Gene, it was the fuse. What causes this?
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Old 12-12-2007, 05:25 PM
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Overheating or loose wire connection.

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