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Microwave oven Repair Aid....
Always remember Electricity is dangerous and should be treated with respect. Microwaves are very dangerous, they can still shock you even unplugged!! These pages are to help give you indications of what might be wrong and some safe "how to check" or repair help.
Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it. With the microwave unplugged. This is a common way to do this....
Common problems and solutions -
Q - My microwave seems to shut off every once in a while, what might be wrong? A - Make sure you hear the fan is still operating in your microwave. Next is to make sure the air intake grill on your microwave is not plugged up with air borne dust and dirt.
Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food? A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.
Q - My microwave is running and sounds like it is working but will not heat up anything. A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running. A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
Q - My microwave went dead when I opened the door ( same problem as closed the door ). A - This often is a stuck or faulty door switch and it has blown the interior microwave fuse.
Q - My microwave is completely dead. A - House fuse has blown or interior fuse inside the microwave has blown ( usually a part inside the microwave makes this fuse blow ) Sometimes a bad fuse holder inside the microwave cannot hold the fuse tight enough and the fuse will blow as well.
Q - The fan in my microwave oven is not running will this hurt my microwave? A - YES, the fan cools the magnetron and electronics, take the microwave in for service, most fans are not too expensive to replace.
Q - My microwave blows the fuse inside itself as soon as I push the start button. A - Usually a shorted high voltage capacitor...see components section. A copy and tip from Prashanth: Description of problem (Maytag
CMV1100Q) : Solution: High-voltage
capacitor shorted.
Replaced it and microwave works fine. Remove the vent fan hood Microwave works great now.
Q - I burnt something in my microwave and now it is dead...help! A - The fuse inside the microwave may have blown, but more commonly the flame/oven thermostat has sensed the over cooked food and the flame/oven/cavity thermostat has opened up - Info on that
IMPORTANT DISCLAIMER: The Author of this web site assumes no responsibility for inconveniences or damages resulting from use of the information he supplies. The consumer or reader is individually responsible for his or her use of the information supplied and uses this information at their own risk. The author of this site has no liability for errors, omissions, or any defects whatsoever in the information or instructions, or for any damage or injury resulting from the utilization of said information or instructions....
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Use an old tooth brush to help clean off the grille area.
