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Sharp R-1874 shuts off after 59 seconds

nitrocpl on Oct 24, 2007

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My microwave/convection shuts off after 59 seconds. One guy suggested I replace circuit board. Another guy says it could be several things. Any specific advice?

May 09, 2009

- Sharp R-93ST shuts off after 59 seconds! - Guest

Jan 27, 2009

- Same 59 seconds. In 2004 Holiday Rambler Scepter. Service tech was just here. Says Circuit board bad. Quote to fix $387.62. Ouch!! Did anyone get there's fixed? What was cause and what was fix. I can find the board for $132, was quoted $218 by tech for part $155 for labor. I took mine apart, (I watched the tech). Looks like board just unplugs in several places. Should be easy to replace. IF THAT IS THE PROBLEM. Pain in the **** pushing start button every 59 seconds. - rphilljr48

Jan 24, 2009

- my microwave stops after 59 seconds no matter what time I put in - jbarnes431

Jan 06, 2009

- I have the same problem. How do I get to the damper assembly. Do I need to take the unit down first? - pgovernali

Sep 09, 2008

- Same 59 second issue with an R-1874 installed in a 2004 Monaco Diplomat Motor Home. Issue started between outings. Just looking into the possible cause and found your website. The unit was built in 11/2003.- jimtomfulton

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Best Solution

posted on Nov 05, 2007

MicrowaveSvc

Rank: Guru

Sharp Expert
Rating: 88%, 4451 votes

That would be a problem in the damper assembly, either a bad switch or motor, or the damper door is jammed or blocked.

Consult the attached diagram for general reference.

The damper switch is the same as the primary interlock (door) switch.

You can get Sharp parts from Tritronics at http://www.wehaveparts.com

Comments:

Nov 05, 2007

- See my solution above. That's gonna fix it.

Mar 20, 2008

- .
Its location varies by model, but you'll have to take the outer cover off to find it.

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

Dec 23, 2008

-
The best place to order Sharp parts is Tritronics.

Or you can call them toll-free at 866-779-5835.

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

Jan 02, 2009

-
UPDATE: Tritronics is now Encompass and you can order from them here or by calling 866-779-5835 toll-free.

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Solution #2

posted on Jan 09, 2009

jimtomfulton

Rank: Apprentice
Rating: 0%, 0 votes

My problem turned out to be the control switch which was a $15 bill plus another $90 in labor. I had to remove the microwave from the motor home and take it in for repair. The removal can also be handled through the motor home dealership and the cost will be higher.

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Solution #3

posted on Mar 20, 2008

ArchH

Rank: Apprentice
Rating: 0%, 0 votes

In the next couple weeks mine will be going into a shop that only repairs microwaves.
I can't get it unmounted from my motorhome so that has to be solved first.
I will post back here when I get the final fix.

Comments:

Jan 03, 2009

- My problem turned out to be the damper motor.

$14.95 for the motor.

Total bill was $106.18 which included removing from motorhome, repairing and then reinstalling in the motorhome.

Damper assy is somewhere inside the microwave. Not too easy to get to I assume.

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15 Other Users Have The Same Problem - Continued

Comment by neubie426, posted on Aug 29, 2008

I am having the same problem shutting off after 59 sec. Sharp R-1874 model.
Did anyone replace the control unit? That is what we were told to do but want to make sure this is the part we need to replace because the costs is about $150.00.

Comment by Mr Dave, posted on Aug 24, 2008

Same problem as those listed. Shuts off in convec or Micro after 59 secs. Also in a motor home. What co-incidances that there should be so many in motorhomes. Mine is a Monaco Windsor 2004 40' PST.
I am now looking for parts before I pull it out. Any suggestions.
Mad Hatter

Comment by adawntlw, posted on Jul 22, 2008

I have the same problem with microwave shuts of after 59 sec. It is a built-in, in a 2006 hoilday rambler, we tried to take the front cover off, and this is impossible how do you remove?

Comment by Brasto, posted on Jun 05, 2008

Same problem noted on my SHARP R-937 (R-93ST).
I am not sure yet whether this model has a Damper assy installed....?
The 59 seconds issue could be a timer IC/uProcessor on its control panel?
My other suspect is the timer/weight setting knob wich is a Digital Control Potmeter rather than just a conventional analog?

Comment by Guest, posted on May 06, 2008

Followed FixYa suggestion, Microwave is back, mounted and working great. Cost total of 16 dollars for new damper motor and a couple of hours of messing around...Thank you so much, and the wife thanks you. Guest.

Comment by Guest, posted on Apr 25, 2008

Shuts down in 59 seconds. Checked with Sharp and a dealer was suggested.

Comment by pjmorgan, posted on Apr 19, 2008

I have the same problem with it shutting off after 59 seconds. We have a Sharp R-1874 Convection. We are in a motorhome. Recirculating non-vented. Any help?

Comment by ArchH, posted on Feb 19, 2008

I have the same 59 second problem. Just exactly where is the damper assy? As I look at the front of the unit is it on the left or right side?
My microwave is mounted over the stove in a motorhome. Do I need to remove it to repair the damper assy?

Comment by Guest, posted on Jan 21, 2008

Mine also only runs 59 seconds. Your tip about the damper...where is the damper assy?

Comment by mrsbells, posted on Nov 02, 2007

i am having the same problem

Sharp R-1874 shuts off after 59 seconds

nitrocpl on Oct 24, 2007

May 09, 2009

Jan 27, 2009

Jan 24, 2009

Jan 06, 2009

Sep 09, 2008

Best Solution

Nov 05, 2007

Mar 20, 2008

Dec 23, 2008

Jan 02, 2009

Solution #2

Solution #3

Jan 03, 2009

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15 Other Users Have The Same Problem - Continued

Comment by neubie426, posted on Aug 29, 2008

Comment by Mr Dave, posted on Aug 24, 2008

Comment by adawntlw, posted on Jul 22, 2008

Comment by Brasto, posted on Jun 05, 2008

Comment by Guest, posted on May 06, 2008

Comment by Guest, posted on Apr 25, 2008

Comment by pjmorgan, posted on Apr 19, 2008

Comment by ArchH, posted on Feb 19, 2008

Comment by Guest, posted on Jan 21, 2008

Comment by mrsbells, posted on Nov 02, 2007

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