Question about Emerson Mw8999rd Microwave Oven

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Runs but doesn't heat

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If it has a turntable does it move? Possible diode, inverter board (may have the diode on it or the Magnetron.

If an inexpensive unit it may be cheaper to replace than repair.

Posted on Nov 05, 2012

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

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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You can also download manuals, installations info, and parts lists here.

dee77f7.jpgWe're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Here is your free answer in under 10 minutes ...

You have a faulty door safety interlock switch. I wish you would have searched your problem here before you spent all that money on the magnetron. I have answered this question dozens of times here at this site.

When the oven runs but doesn't heat, more often than not it is nothing more than a faulty micro switch in the door latch system. When the switch doesn't work properly, the oven doesn't know the door is closed. If the door isn't closed, the oven will not energize the magnetron. Capacitors and magnetrons are **** and expensive answers but these items are extremely tough. It is the tiny contacts in the micro switch that can not stand the repeated abuse given them when we (read me in that number too) open the oven while it is energized causing a repeated flash across the contacts.

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HI>An oven is equipped with a heating filament that is called.Magnetron.Now if the motor is working but the unit is not heating .Then MAGNETRON is defective and must be replace.

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