Question about Sharp R-340 Microwave Oven

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My Sharp R-340D microwave works perfectly but Does NOT HEAT FOOD

Dear All , I have a Sharp Microwave model R-340D . it has worked fine for about 2 years . but suddenly , It stoped to heat at all . All other functions operates pretty well , ie , the lamp is on and the motor rotates during heating . and the timer operates we during the setted heated period . However , NO HEATING occurs . There is NO buzzling sound . What do you recommend me to do . Thanks, Best Regards, Eng.Waleed Said Mohamed .

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Re: My Sharp R-340D microwave works perfectly but Does...

Waleed, Since the microwave is going through all its motions we can feel safe that the oven and magnetron thermostats are ok. If they were bad you would not have a display. Just inside the control panel to the left, you have 3 switches which the door activates. A primary (top switch) a secondary (bottom switch) and a monitor switch (middle). If the primary or secondary switch is not closing when the door is shut, you high voltage side will not activate, therefore no heat. If the monitor switch failed or found either the primary or secondary switch closed with the door open, it would blow the main fuse and the oven would be dead. Therefore Im leaning on either the primary or secondary switch not operating correctly. When checking these switches, unplug and discharge the capacitor. This is high voltage. Good luck

Posted on Jun 17, 2006

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Re: My Sharp R-340D microwave works perfectly but Does...

Check the relay for the magnetron it is the big relay burned contacts


Posted on Oct 10, 2007

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I remember last time when it was working. I pressed the start botton before I closed the door. So it didn't start automatically, and I pushed start and it worked(it still heat up the food), but it doesn't work now. Help Please!!!
I have a Whirlpool Gold GH5184XPQ.

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