Question about Sharp R-1874 Convection/Microwave Oven

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My r-1874 microwave unit will not run unless a small wood handle is put under the door. This has worked in the past but now this little trick does not work. Any idea the part that not working properly

Microwave will not heat unless a small piece of wood is under the door. Now this trick does not work. Any Idea what part is broken

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  • Sharp Master
  • 9,047 Answers

I would say the mount for your bottom or top door switch is loose, misaligned, or broken. And you may have a failed door as well. See my help file on door switches here.

Slamming the door and opening the door while it's cooking instead of hitting the "Stop" pad before opening it both contribute to door switch trouble.

The service manuals covering this model are here and here.

You can order Sharp parts from Encompass here or you can call them toll-free at 866-779-5835.

Posted on Feb 17, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

red-pt
  • 2 Answers

SOURCE: Over the range microwave

I have the R-1460 in the same series with the identical symptoms. After reading MicrowaveSvc's solution I started taking apart to view the door switches and found the upper door switch to be the problem, but not a switch failure a support failure. A small bottom plastic support post that holds the switch in place was broken (probably from repeated use/abuse) allowing the switch to move when the door hooks were engaged, thus not actuating the button switch. Since the problem was mechanical rather than an electrical bad switch, I made a small support arm for the switch from an old plastic mechanical pencil and glued it in place to hold the switch in its correct position. Problem solved, microwave works! Thanks to MicrowaveSvc's description of door switches.

Posted on May 26, 2007

SOURCE: Fans continues to run.

door switches or control circuit, may be loose contact or open check all wiring and circuit...

Posted on Dec 18, 2007

ginko
  • 19396 Answers

SOURCE: Microwave not heating up

Check the door switch, when it is faulty the oven will turn on but turntable, fan and magnetron wont operate.

Regarding parts, contact the seller here to purchase parts.

You can also order from MicrowaveSvc , they also provide parts.

Posted on Apr 27, 2009

  • 353 Answers

SOURCE: Kenwood microwave not heating

cheaper to buy a new one

Posted on Jun 30, 2009

bulldogchief
  • 388 Answers

SOURCE: microwave popped and now does not heat

Okay, first we need to separate the situations. You were boiling water on the stove and had the range hood fan running to **** up the steam. Then you put something in the microwave to heat and you heard a pop and then zip-o.

The water on the stove has nothing to do with the situation, the fan you turn on is not part of the microwave, so it has nothing to do with the microwave.

The pop you heard and then the humming suggests the magnetron failed. You said you found a blow fuse and replaced it and still nothing, right? The magnetron is the most likely culprit...I would think it is safe to say that the magnetron shorted and drew enough current to blow the fuse.

Replace the magnetron and if that doesn't work, let me know here. Good Luck!

Posted on Sep 14, 2009

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1 Answer

Sharp R-1874 works only by pressing the door in


Your connection is bad. Start with a good and complete cleaning of the product. UNPLUG FIRST. Sometimes in the hinges things gum it up. DO NOT STICK anything into the door latch area.
If this continues, you have an issue that must be decided if you should REPLACE or repair. Repair will cost more than replacing. Sorry.

Mar 06, 2014 | Sharp R-1874 Convection/Microwave Oven

1 Answer

I found the real fix to install a new handle on a KitchenAid Kitchenaid KHMS155LSS Microwave...none have been correct until I seen this posting...it works! Use this link to see the...


Here's my standard post on getting into the doors:

Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.

Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.

You can find handy exploded views and order parts by model number here.

9f32bc4.jpg

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

Jul 07, 2011 | KitchenAid KHMS155LSS 1000 Watts Microwave...

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Tappan Convectionaire stove with built in microwave. Purchased in 1985. This is the 4th time the handle on the microwave door has broken off. We were able to replace it in the past, but I cannot find it...


we have the same tappan oven/microwave combination. We are looking for the knobs for this. Its a great oven, but we need these parts. Our microwave handle broke a long time ago and we had one made from wood. If you are going to ditch the old oven would you be willing to sell the knobs?

Aug 25, 2010 | Tappan TMT104E1 Microwave Oven

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R-1874 shuts down after 59 seconds


That switch is supposed to tell the computer if the damper door is open or closed. If it does not go to zero ohms, the CPU doesn't know what to do. Check the thermistor too...... just in case...

Sep 12, 2009 | Sharp R-1874 Convection/Microwave Oven

1 Answer

My door handle is broken. Is it posssible to


You should be able to buy only the door handle and avoid having to replace the entire door. Appliancepartspros.com carries the handle. Just type in the model number you provided and look for item #3 under the parts listing. The part number and price varies based on the color you need. Make sure you order the correct color. To access the door handle mounting screws on MOST microwave ovens, you have to remove the inner door panel that goes around the perimeter of the glass. You can use a small screwdriver to carefully pry the plastic up and work your way slowly around the perimiter of the glass. Most microwave ovens also have grooves in the panel that you can insert the screwdriver into. Use care not to pry against the glass. The glass is tempered and also has an RF shield that prevents harmful microwaves from potentially harming the consumer. If you break the glass, you will need to purchase a new door.

The door handle screws are located behind the inner panel. Simply remove the broken handle and install the new one. Re-insert the inner door panel carefully and gradually work your way around the perimeter of the door glass and make sure it snaps back into place.

If you have questions, please let me know. I hope you find this information helpful.

Jul 06, 2009 | GE JVM1640 Microwave Oven

1 Answer

Sharp 1874- Door seems to "jar open" and oven stops


if you have a warranty get a new one installed they have to honor your warranty or better yet if they want payment you want new unit sometimes they come deffective from the factory ad you may have gotten one of them

Feb 20, 2009 | Sharp R-1874 Convection/Microwave Oven

1 Answer

Microwave will not run unless i jiggle the handle.


This is usually caused by either a bad door switch or a loose door switch mount, which are pretty simple problems to fix.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here onFixYa:.

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

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

If you only need a switch, you can order a universal type here for $5 postpaid.

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

Dec 26, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

How do I remove the door from our Sharp R-1874 microwave


Fixed the problem without any help from anyone. If you ask and ask and get no help I guess it is time to take on the problem and see if you can resolve it and I did. NO IT WAS NOT EASY but with a little thought and time over the last 2 days I did get the door changed. Thanks for letting me post even though I got NO help.

Dec 09, 2008 | Sharp R-1874 Convection/Microwave Oven

1 Answer

Microwave Oven Door Handle Replacement


You shoul take off the hole door, use something like a flat screw driver and wedge the plate off.
some of the mics got tamper holes where it hooks in.

Hope it works...

Sep 09, 2008 | Whirlpool MH7155XM Microwave Oven

4 Answers

Sharp R-1874 shuts off after 59 seconds


I had the same problem. Turned out to be the micro switch and damper motor. I replaced both myself and fixed the problem for less than $40.00. The best advice I got was replace the switch, reconnect the motor and make sure the motor runs through a damper door cycle. It didn't run, even though it showed continuity and had power, so I replaced the motor which solved the problem. The micro switch which is activated by the cam on the damper motor has to be cycled within one minute, or the unit shuts itself off. The damper motor on my model R-1870 is found in the right rear section of the assembly when facing it. You have to remove the unit, and remove the outer casing to get to it. The damper is a simple sheet metal door, activated by the motor, and the switch mounts at the top of the motor and is activated by the same cam that activates the door.

Oct 24, 2007 | Sharp R-1874 Convection/Microwave Oven

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