Have whirlpool microwave oven, installed 5/20/11, Model #WMH 116 3XVS - 2, Serial # TR O5O 13549. The plastic packet of instructions we received did not include an owner's manual with instructions as to how to operate the microwave. Please provide one or tell us how to get one.\r\nThank you.

Question edited for clarity and add MAKER!

Replacements

https://www.google.com/search?q=whirlpool+30+over+the+range+microwave

They all come in standard widths. Any 30" microwave should be fine.

Whirlpool MH2175XST
1.7 Cu. Ft. Over-the-Range Microwave with 1,000 Cooking Watts, Warm Hold Cycle and Sensor Cooking Cycles: Bisque 4.6 quick specs
Style: Over the Range
Width: 29 7/8 Inch
Depth: 15 3/4 Inch
Height: 17 1/8 Inch
Capacity: 1.7 Cu. Ft.

It certainly sounds like something is wrong. My first GE microwave was like this and it wasn't advertised as anything special. After a long life I replaced it with a Sharp (makes most all microwaves) and was disappointed at the cycling on and off. Now Panasonic makes what they call Inverter microwaves with continuous power. I recently bought a GE (probably made by Panasonic) with this Inverter technology and am very pleased with it. Make sure the microwave you have says AccuWave on it, if it does, it sounds like the magnetron may have been replaced with a non-continuous type of magnetron. Was it bought refurbished/returned/clearanced? I think when I was researching this that it MAY have something to do with the type of power supply to the magnetron and not so much the magnetron itself.

Your parts list is here:
http://www.kitchenaid.ca/assets/pdfs/literature/Repair%20Part%20List%20-%20W10315513.pdf
Installation instructions are here:
http://www.kitchenaid.ca/assets/pdfs/literature/Installation%20Instructions%20-%20W10247296.pdf
Owners manual is here:
http://www.kitchenaid.ca/assets/pdfs/literature/User%20Instructions%20-%20W10182518A.pdf

Hopefully this is what you wanted.
If none of the links work use this link:
http://shared.whirlpoolcorp.com/product_literature/search_results.jsp?searchTerm=WMH2175XVT&siteCd=WHRCOM&userType=Servicer and then type your model number on the search window. Do not use dashes in the model number and exclude the last digit if nothing comes up.
Thanks for choosing FixYa,
Kelly

The manual for this model is available on this page:

http://shared.whirlpoolcorp.com/product_literature/search_results.jsp?searchTerm=MH1160&siteCd=WHRCOM&userType=Consumer

Whirlpool customer service is here and you can also enter your model number on that page to download your owner's manual, installation instructions, etc.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

These interlock systems consist of the Interlock, Cam Plate, and Interlock Spring and you can find them listed and purchase them (if needed) here.

Enter your full model number (MH8150XJT0 or MH8150XJT1) and look on the "Interior and Ventilation" diagram for reference numbers 11, 12, and 13.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

Or you can get them there.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

sears should be able to get you the installation instructions and maint manual for this also, get on line go to sears.com and look up uour microwave part number like you did and look for the manuals

You can download GE owner's manuals and installation instructions here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Whirlpool customer service is here and you can also enter your model number on that page to download your owner's manual, installation instructions, etc..

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

htmYou can usually find helpful exploded view diagrams and order parts by entering your full model number here.

-.htmWe're happy to help and we appreciate your thoughtful rating of our answer.