Sharp R-340 Microwave Oven Logo
Waleed Makarem Posted on Jun 17, 2006
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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 .

  • Anonymous Mar 22, 2014

    no heat

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  • Posted on Jun 17, 2006
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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

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  • Posted on Oct 10, 2007
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Check the relay for the magnetron it is the big relay burned contacts

 

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