Your microwave may turn on but not heat up. How to test a microwave high voltage diode with a multimeter. The process for setting the power level (other than 100% which is automatic) on your ME18H704SFW Microwave varies depending on whether you're using single stage or multi-stage cooking. Use a multi meter and check the fuses/cut outs in microwave. The microwave main fuse will cut the flow of electricity if too much current passes through it. The power goes off before the set time haselapsed • If there has not been a power outage, removethe plug from the outlet, wait ten seconds, thenplug it in again. This part protects other microwave components from power fluctuations, and causes a complete loss of power when it fails, meaning your microwave won’t work. If you are aware of the cause of the fuse failure, such as opening or closing the microwave door, you can also test the door switch to see if that is working. That means you should be able to cook and heat food in a typical microwave oven for 2,000 hours before the oven loses power. This may not seem like a lot of time until you think about how you use your microwave oven. We bought all new Samsung appliances just over a year ago, and every single one has been repaired. If the control is not in child lock and you can't change the power level then the control most likely has a shorted keypad. If you can program the microwave and the fans and lights work but it doesn't heat then then problem can be as simple as a fuse or as major as an magnetron/transformer. Unplug the microwave, wait at least a minute and reconnect the power to cancel demo mode. Check the breaker box to ensure the microwave breaker is not tripped. The capacitor is in the back side lower corner. You may have to hold a few buttons once the power comes back on to completely cancel demo mode -- check your manual. The most common cause for a microwave oven not working at all is a blown main fuse. Unplug your microwave before beginning this inspection. The typical microwave magnetron tube has an average life of 2,000 hours of operation. Causes of microwave not working but has power; Why not to put aluminium foil in microwave; Microwave stopped working, no power? For step-by-step instructions, please refer to page 16 of the User Manual that comes with the unit. Check to see if microwave is plugged into a power outlet. The capacitor must be discharged before beginning any repair. I contacted support, and they said my warranty was up two months ago, but offered no assistance to resolve the issue. In my case, since the microwave oven has stopped working and unplugged power for a long time and there is one discharge resistor in the circuit, so I didn't show the discharge steps. When this happens, the fuse is considered “blown” and the fuse will need to be replaced with a new one before the microwave will start working again. Learn how to fix it; A detailed guide on over the range microwave installation; Microwave exhaust fan not working: Causes and solutions; Everything you need to know about Smart Ovens The only thing worse than a Samsung … The controls light up, and the oven accepts input, but the timer often runs at double speed. I agree with the comments of instructablers. If you had a power outage and now the microwave does not work, the most probable reason is a fuse in the microwave is blown. My Samsung Microwave also will not heat. This could be caused by a problem with the high voltage diode, which helps to power the magnetron. Locate and remove your high voltage diode to test it for continuity.

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