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KItchenAid microwave KHMS1850S: interlock switches replaced, but fuse keeps blowing

I had replaced 2 of the interlock switches in the microwave since the light would not turn off when closing door, and the microwave would not start cook mode. After plugging in and closing door, the fuse blows. I may have incorrect wires connected. Does anyone have a service manual for this model?

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Http://kitchen.manualsonline.com/manuals/mfg/kitchenaid/khms1850s.html

Posted on Jan 27, 2015

Testimonial: "Firefly22, unfortunately this is a user's manual, not a service manual. The user manual does not contain wiring diagrams (ie. wire colors to which lead)."

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How can I obtain a service manual for KitchenAid microwave KHMS1850S,need wiring diagram to interlock switches.


Pulled up a schematic on this will try and help the first pic looks as though you removed the secondary switch the bottom one if so that is the wrong switch it should be a normally open switch that one is normally closed this switch goes up top on the other side of the primary switch the one with 3 terminals, look at the second pic the switch with 3 terminals that red wire in the wrong spot the skinny orange goes there the switch I just told you to put up top the red goes to one terminal the white and brown middle form the 3 terminal goes to the other terminal, the blue/white and blue go to the bottom switch this is a normally open switch if you don't know how to read a switch look at the switch look at com follow the line to where it stops if it is NO=normally open, NC=normally closed your primary switch is in the right spot you want the switch next to it to be NC and the bottom switch NO it blew the 20 amp fuse once you correct the switches and wiring and put in a new fuse if you have no power then it blew past the fuse and burnt out the filter board happens some times about 60 bucks let me know if this helps

Jan 25, 2015 | KitchenAid Microwave Ovens

1 Answer

R-820js wont heat


see this causes and fix it .God bless you
f the microwave will not work at all, make sure power is on at the outlet and test the electrical cord. Test the fuse and replace it if it is faulty. Also check the door to make sure it closes properly. Test and, if needed, replace the fan. If the oven doesn't cook or cooks only intermittently but the display is on, check the door interlock switch, the thermal cutout (see the Applaince Controls Fix-It Guide), and the fan, replacing parts that don't pass the test.
If the oven keeps blowing fuses, check for a faulty door interlock or monitor switch.

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Oct 02, 2012 | Sharp R820JS 900 Watts Convection ...

1 Answer

GE microwave oven model#JVM1441BH04 when you close door on switch activates and oven comes on. Only goes off when door is opened.


HELLO.

the problem your are experiencing with your microwave oven is a failed interlock switch.
Be careful when closing your microwave door. Slamming the door too hard is one of the main reasons that the interlock switch is damaged.

Slamming the microwave door shut can easily blow the microwave fuse, but they can also blow due to problems with the interlock switches.
A microwave oven will not function until the fuse is replaced.

Instruction on how to replace fuse on microwave.

1. Unplug the microwave from the electrical outlet to prevent electrocution. Place the microwave in a well-lit area to be able to locate the fuse.

2. Use a screwdriver to remove the outer cabinet of the microwave, and follow the power cord to the fuse. The fuse is located 2 to 3 inches within the microwave and is attached to the power board.

3. Observe the fuse to determine if it is blown. Blown glass fuses will produce burn marks on nearby surfaces, or the internal fuse wire will be black and melted, while ceramic fuses show no outward appearance of being blown.

4. Determine if a ceramic fuse is blown by testing it with an ohmmeter. If the ohmmeter reads zero ohms, your fuse is not blown. Other readings on the ohmmeter show that your fuse is blown.

5. Replace the blown fuse by popping it out of its holder, and snapping a new fuse in its place. Tighten the fuse clips by squeezing them together with your fingers.

6. Replace the outer cabinet of the microwave, and plug the microwave back into the electrical outlet. Test the microwave to see if it's working properly.

thanks.

Sep 22, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Does a kitchenaid microwave have a fuse inside


Yes it does, unplug unit, remove back cover, "2 to 6 screws" on the right side look for a silver rectangular capacitor, discharge it across the two pins with a long screwdriver, next look for a ceramic fuse, "white body with silver ends" remove and replace with same type and rating. If the fuse blows again it indicates a bad door switch.

Jun 20, 2011 | KitchenAid Microwave Ovens

1 Answer

Microwave fuse keeps blowing on my Panasonic Microwave NN-9854P


I would check the door interlock switches and then if that doesn't fix it replace the invertor board and possibly magnetron.

Feb 21, 2011 | Panasonic NN-P295SF Microwave Oven

1 Answer

No power braker ok


There is an internal fuse on most microwaves, it will "Blow" if the door interlock switches are not happy, sometimes the fuse just blows, like some circuit breakers do.. get a few extra, replace it and see what happens..if it doesn't blow again, you're most likely ok, if not, there are more causes for the internal fuse to blow, beyond the interlocks, it's not going to be cheap.

Oct 25, 2009 | Maytag Microwave Ovens

1 Answer

Emerson model 8117w stop working all at once


This microwave has three door interlock switches and a fuse that are easily replaced by the consumer. Unplug the microwave. Remove the cover by unscrewing the 5 screws on the cover. Four are on the back, one on the lower right. One or more of the screws may be torx T15S (security)(bit available at hardware stores). As in all microwaves the capacitor should be discharged by shorting the cap terminals together. Note that the three switches are in a single black plastic carrier. Remove the two screws securing the carrier and the switches can be released by hand. Replace one at a time so as not to confuse the wiring which is push on spade terminals. Replace the fuse with a 20 amp 125v slow blow (radio shack). Do not plug in power until all the switches are reinstalled as a safety feature will cause the fuse to blow again. If fuse blows repeatedly it is most likely that all three interlock switches are not closing properly. Check to make sure that all switches are seated correctly in the black plastic switch carrier and that the 2 carrier screws are tight. Observe the switches as the door is closed. Replace switches and/or carrier as needed. While the cover is off you may want to clean off the fan and/or replace the bulb. Also check for proper seating of the control board connections.

Aug 13, 2009 | GE Microwave Ovens

1 Answer

Panasonic NNA554W blows 10a fuse when microwave comes on


Possibly the interlock monitor switch is bad or out of adjustment. This switch is designed to create a short circuit across the power line (and then blow the fuse) if you attempt to defeat the door interlock and operate the oven with the door open. A shorted capacitor or diode could also cause the fuse to blow. Because of lethal voltages inside and the possibility of microwave leakage if repairs aren't done correctly, you are best off leaving microwave service to professionals.

May 15, 2009 | Panasonic NN-SN657SMicrowave Oven

1 Answer

Fuse


The Interlock Monitor Switch is an added
safety check on the Primary and
Secondary Interlock Switches. If the
Primary and Secondary Interlock Switches
allow the oven to operate with the door
open, the Monitor Switch will blow the
fuse.

You can get more information about adjuting the interlock switch from this link

http://136.166.4.200/contents/Microwave/LMVM1935xx/LMVM1935xx_Service_Manual.pdf

sections 7-11 thru 7-12 discuss the door interlock adjustment that will cause the 20A fuse to blow if it isn't set up right. I hope this helps you...

Aug 03, 2008 | LG LMVM1935 Convection/Microwave Oven

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