How do you access the door switches for the microwave.

Door Switch Start Your Repair Here
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- Takes less than 15 mins
We have 13 installation instructionsThere are many reasons your microwave won't turn on, one of which might be a faulty door switch. The door switch, also known as an interlock switch, signals other microwave components to begin powering when the door is closed, and to stop when the door opens. For this reason, everything else may appear in working order but the microwave will not begin heating. To access the door switch or interlock switch, unplug the microwave and dismantle the cabinet. The switches have terminals which are marked C for common and NO for normally open. Check each terminal with a multi-meter for continuity. If there is continuity while the actuator button is engaged, that means the switch is working. If there is no continuity, replace the switch. You can also take this opportunity to make sure the door hooks are working properly.
Ceramic Fuse Start Your Repair Here
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We have 1 installation instructionIf your microwave won't start and the display is blank and unresponsive, the issue may be with the ceramic fuse. 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. To access the ceramic fuse, located inside the cabinet near the power cord, first unplug your microwave. Use a multi-meter to test the continuity of the fuse. 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. If you are unaware of the reason for the fuse failure, you may want to test other microwave parts such as the magnetron, high voltage diode, capacitor, and transformer.
Thermal Fuse or Cut Out Start Your Repair Here
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- Takes less than 15 minsA problem with the thermal fuse or cut out could be the reason your microwave won't turn on. The thermal cut-outs, also known as thermal fuses, help keep the oven from overheating. When the thermal cut-outs fail, your microwave won't turn on as a safety precaution to keep it from getting too hot. To access the thermal cut-outs, first unplug your microwave and then remove the cabinet. Once you locate the thermal fuse, disconnect its wires from the terminals. Use a multi-meter to test for continuity, and replace the thermal cut-outs if there is no continuity. Take this opportunity to also check that the cooling fan is working and not causing the microwave to overheat by cutting off airflow.
Door Latch Assembly Start Your Repair Here
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We have 4 installation instructionsYour microwave may not start because of an issue with the door latch assembly. Most door latch assemblies are made of plastic hooks that stick out of the door and engage the door switch when the door is closed, signalling the rest of the controls to power the microwave. If the hooks are damaged or lacking tension due to worn-out springs, the switch will not latch properly meaning the microwave won't turn on. To access the door latch, first disconnect the microwave from its power source, and remove the inside door panel, which is held in place with plastic tangs. Inspect the door latch and replace it if it appears to be damaged.

James,
You might have a problem with one of the micro-switches in the door sequence. If one of the micro-switches has gone bad, it usually causes a short and that is what blows the fuse. If you have access to a meter, you can check the continuity of each switch and figure out which one is bad and replace it. Just remember to unplug your microwave before attempting any repairs. Usually, there are 3 switches and 2 of them usually are normally open switches and the 3rd is a normally closed switch. Hope this helps!

BEFORE DOING ANYTHING DISCONNECT OVEN FROM POWER. I do NOT recommend doing repair by yourself, if you NOT are really very familiar with electric repair, or have at least basic training in electric device repair and maintenance.
"When door is opened display goes dark. When door shuts display lights all characters and then says "touch clock"."
Obviously, by opening door, oven gets disconnected form power line.
This is mostly caused by loose connections on wiring socket, and can be anywhere inside. Check security micro switch on door latch. This switch normally disables only running the oven when door is open, for security reasons. In your case, it seems that opening door disconnects oven from input power. Sometimes the switch is loose, or wires are not firmly pushed in the socket. If the power line wiring is loose, and by opening door looses contact with socket, it can touch metal housing inside, cause short, electric shock, serious even mortal injury and fire. This is dangerous high voltage switch, and to access it one must open oven from the back and take off the cover. I do not recommend doing it by your self.
Rem: Replacement micro switch is couple dollars.

When microwaves first got popular I used to be a helper with my next door neighbor who fixed them. I does sound like you should have covered it with those switches. If you close the door very slowly, pulling back on the door see if you can hear all 3 switches clicking. You should be able to hear them easily. If you only hear the first 2 try pushing on the door to hear the 3rd. If it will click with pressure on the corners or in the middle then you door is tweaked, possibly from pulling on the door hard to open it or smacking into something on the edge. If you can hear all 3 switches and it still wont start then its going to be the sensor that receives the signal from the switches. I'm not sure how accessible those are on today's models since they make them as disposables now, back then they cost around $500 so they were serviced.

I would strongly consider replacing the microwave oven, prices have dropped considerably. The problem you are describing is in the keypad controller board.

Hello :

This happens because of a bad door switch . The plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door .

Check also the turntable . It could be out of it's right place .

WARNING :

1:Don't slam your microwave door because this may cause the fuse to blow and this is the reason of bad door switch problem .
2: A microwave is capable of giving you a serious electrical shock even when it's unplugged , so I recommend you to call a repair technician for help .

please don't forget to rate .

good luck .

Hi


Thanks for using FixYa. 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. Also 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.


Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks
Rylee

HAVE YOU CHECKED OUT THE DOOR SWITCHES THERE ARE USUALLY 2-3 MICRO SWITCHES.

You need a couple of cheap microswithes that the door latches hit when you close the door and a new control for your display problem which sharp has had a problem with

GH918 4xLQ-1 Microwave
Runs for a few seconds, stops, and displays F7.
I've lost my manuel. Thank you!

Robin Newell
1702 Dover Circle
Salina, Ks. 67401
(785)827-6185
[email protected]