There is proper display and the timer is functioning,inside light is also functioning, the instrument is getting off after the fixed time but the contents are not getting heated, the sound is louder
With no heat and louder noise, chances are you have a shorted high voltage rectifier diode or bad magnetron.
Here are some links you or someone you know can use for test help, but read their safety warnings first:
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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microwave oven is not functioning
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