Discuss

Micro not heating. Switches acting opposite.

 in

Microwave Repair

. "

My Whirlpool over the range microwave stopped heating foods. All else seems fine with the unit. I tested the door

..."
 
 
Register | FAQ's | New Posts | Today's Posts | Extras
Appliance Repair Forum > Appliance Repair Help > Microwave Repair » Micro not heating. Switches acting opposite.

Post New Thread  Reply By reading any content on this site you agree to AppliancePartsPros.com, Inc. disclaimer and Terms of Use.
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 01-28-2013, 03:00 PM
Junior Member
 
Join Date: Jan 2013
Posts: 6
Kenneth Seibold is on a distinguished road
Default Micro not heating. Switches acting opposite.
Model Number: WMH2175XVQ   Brand: Whirlpool   Age: 1 - 5 years   

Appliance Parts from AppliancePartPros.com


My Whirlpool over the range microwave stopped heating foods. All else seems fine with the unit. I tested the door switches and found that the lower switch was 0 ohms when door open and infinity when door shut - the opposite of the upper switch, which was 0 ohms when door shut, as I expected. Does that mean the lower switch is bad? Can a switch "change polarity" like that? Also, can I test to see if the problem is the lower switch by hooking it all back up such that the lower switch doesn't get pressed in when the door it shut, thus making both switches at 0 ohm resistance when door is shut?


Related Models
Whirlpool WMH2175XVQ0 Microwave Oven 1.7 Cu. Ft.
Whirlpool WMH2175XVQ1 MICROWAVE OVEN 1.6 CU. FT.
Whirlpool WMH2175XVQ2 MICROWAVE OVEN 1.7 CU. FT.
Whirlpool WMH2175XVS0 Microwave Oven 1.7 Cu. Ft.
Whirlpool WMH2175XVS1 MICROWAVE OVEN 1.6 CU. FT.
Whirlpool WMH2175XVS2 MICROWAVE OVEN 1.7 CU. FT.
Whirlpool WMH2175XVT0 Microwave Oven 1.7 Cu. Ft.
Whirlpool WMH2175XVT1 MICROWAVE OVEN 1.6 CU. FT.
Whirlpool WMH2175XVT2 MICROWAVE OVEN 1.7 CU. FT.
Whirlpool WMH2205XVB0 Microwave Oven/Hood 2.0 Cu. Ft.
Whirlpool WMH2205XVB1 Microwave Oven/Hood 2.0 Cu. Ft.
Whirlpool WMH2205XVQ0 Microwave Oven/Hood 2.0 Cu. Ft.
Whirlpool WMH2205XVQ1 Microwave Oven/Hood 2.0 Cu. Ft.
Whirlpool WMH2205XVS0 Microwave Oven/Hood 2.0 Cu. Ft.
Whirlpool WMH2205XVS1 Microwave Oven/Hood 2.0 Cu. Ft.
Whirlpool WMH3205XVB0 MICROWAVE OVEN/HOOD 2.0 Cu. Ft.
Whirlpool WMH3205XVB1 MICROWAVE HOOD COMBO
Whirlpool WMH3205XVB2 MICROWAVE OVEN/HOOD 2.0 CU. FT.
Whirlpool WMH3205XVQ0 MICROWAVE OVEN/HOOD 2.0 Cu. Ft.
Whirlpool WMH3205XVQ1 MICROWAVE HOOD COMBO
Whirlpool WMH3205XVQ2 MICROWAVE OVEN/HOOD 2.0 CU. FT.
Whirlpool WMH3205XVS0 MICROWAVE OVEN/HOOD 2.0 Cu. Ft.
Whirlpool WMH3205XVS1 MICROWAVE HOOD COMBO
Whirlpool WMH3205XVS2 MICROWAVE OVEN/HOOD 2.0 CU. FT.
General Electric WMR03GAZABB REFRIGERATOR
General Electric WMR04BANABB Refrigerator
General Electric WMR04BANBBB Refrigerator
General Electric WMR04BANCBB Refrigerator
General Electric WMR04BANDBB Refrigerator
General Electric WMR04BAPABB Refrigerator
General Electric WMR04BAVABB REFRIGERATOR
General Electric WMR04DATABB Refrigerator
General Electric WMR04GAVABB REFRIGERATOR
General Electric WMR04GAVBBB REFRIGERATOR
General Electric WMR04GAVCBB REFRIGERATOR
General Electric WMR04GAZABB REFRIGERATOR
General Electric WMR04GAZAWW REFRIGERATOR
General Electric WMSE3140A0AA Washer
General Electric WMSE3140A0WW Washer
General Electric WMSE3140A2WW Washer
General Electric WMSE3140A3WW Washer
General Electric WMSE4190A0AA Washer
General Electric WMSE4190A0WW Washer
General Electric WMSE4230A0WW Washer
General Electric WMSR2090T2AA Washer
General Electric WMSR2090T2WW Washer
General Electric WMSR2090T3AA Washer
General Electric WMSR2090T3WW Washer
General Electric WMSR2090T5AA Washer
General Electric WMSR2090T5WW Washer
General Electric WMSR2100T6AA Washer
General Electric WMSR2100T6WW Washer
General Electric WMSR2100T8AA Washer
General Electric WMSR2100T8WW Washer
General Electric WMSR2100TAAA Washer
General Electric WMSR2100TAWW Washer
General Electric WMSR2100TBAA Washer
General Electric WMSR2100TBWW Washer
General Electric WMSR3110W1WW Washer
General Electric WMSR3110W2WW Washer
General Electric WMXR3080T2AA Washer
General Electric WMXR3080T2WW Washer
General Electric WMXR3080T3AA Washer
General Electric WMXR3080T3WW Washer
General Electric WMXR3080T5AA Washer
General Electric WMXR3080T5WW Washer
General Electric WMXR3080T6AA Washer
General Electric WMXR3080T6WW Washer
General Electric WMXR3080T8AA Washer
General Electric WMXR3080T8WW Washer
General Electric WMXR3080TAAA Washer
General Electric WMXR3080TAWW Washer
Bosch WMZ2200 
General Electric WNCD2050A0WC Washer
General Electric WNCD2050A1WC Washer
General Electric WNCD2050A2WC Washer
General Electric WNCD2050A9WC Washer
General Electric WNCD2050B9WC Washer
General Electric WNCJ2050A0WC Washer
General Electric WNCJ2050A1WC Washer
General Electric WNCJ2050D0WC Washer
General Electric WNCK2050A0WC Washer
General Electric WNCK2050A1WC Washer
General Electric WNCK2050D0WC Washer
General Electric WNCK2050D1WC Washer
General Electric WNCK2050D1WW Washer
General Electric WNCK2050H0WC WASHER
General Electric WNCK2050H1WC WASHER
General Electric WNCK2050H2WC WASHER
General Electric WNRD2050D0WC Washer
General Electric WNRD2050D1WC WASHER
General Electric WNRD2050D1WW Washer
General Electric WNRD2050DCWC Washer
General Electric WNRD2050E0WC WASHER
General Electric WNRD2050G0WC WASHER
General Electric WNRD2050G1WC WASHER
General Electric WNRD2050G2WC WASHER
General Electric WNRE6280D0WW Washer
General Electric WNSB8060B0CC Washer
General Electric WNSB8060B0WW Washer
General Electric WNSB8060B1CC Washer
General Electric WNSB8060B1WW Washer
General Electric WNSB8060B9CC Washer
General Electric WNSB8060B9WW Washer
General Electric WNSB9080B0CC Washer
General Electric WNSB9080B0WW Washer
General Electric WNSB9100B0CC Washer
General Electric WNSB9100B0WW Washer
General Electric WNSE4200A0AA Washer
General Electric WNSE4200A0WW Washer
General Electric WNSE5260D0WW Washer
General Electric WNSE5260D1WW Washer
General Electric WNSE5699A0AA Washer
General Electric WNSE5699A0WW Washer
General Electric WNSE6280B0WW Washer
General Electric WNSE6280B1WW Washer
General Electric WNSE6280B2WW Washer
General Electric WNSE6280B3WW Washer
General Electric WNSR2100T2AA Washer
General Electric WNSR2100T2WW Washer
Reply With Quote
See inside of your appliance - diagrams and part photos for virtually every model.

powered by AppliancePartsPros.com
 
  #2 (permalink)  
Old 01-28-2013, 03:56 PM
Simon / APP Team's Avatar
Expert
 
Join Date: Feb 2012
Posts: 5,250
Simon / APP Team will become famous soon enough
Default

Hi.

The switch has marks at the contacts.
C-common, NO-normally open, NC-normally closed.
Check them accordingly.
Please be more specific on what are the symptoms.
Does the m/w comes on at all, lights, turn table?
Does it sound normal or it's humming?

Simon.
__________________
Find Appliance Parts at AppliancePartsPros.com - Largest inventory in the U.S. with 91% of all in-stock orders delivered within 2 business days. Thousands of photos and diagrams make it very easy to find the right part. Enter your appliance model here.
Reply With Quote
  #3 (permalink)  
Old 01-29-2013, 07:26 AM
Junior Member
 
Join Date: Jan 2013
Posts: 6
Kenneth Seibold is on a distinguished road
Default More details

I tested using the only 2 terminals on the switch - COM and NO - and when the switch was depressed (door closed), the resistance was infinity. When it was not depressed and the door was open, the resistance was 0. I suspect that is opposite from what should happen?

The microwave is working just fine except it does not heat foods. It does not make any irregular sounds. Lights, clock and control panel work.

Last edited by Kenneth Seibold : 01-29-2013 at 09:14 AM.
Reply With Quote
  #4 (permalink)  
Old 01-29-2013, 10:03 AM
Simon / APP Team's Avatar
Expert
 
Join Date: Feb 2012
Posts: 5,250
Simon / APP Team will become famous soon enough
Default

Hi.

Did you take one wire off the switch while testing?
Please double check the mark on the switch. Are you sure it's NO not NC (before replacing that switch)?
The NO means there is no continuity when the switch is not engaged.
If you feel OK to do the life test remove the plug from the PRIMARY winding of the hi-voltage transformer and start the MW.
You should read 120VAC across the plug.If the proper voltage is present - most likely you have the bad magnetron.

Part number: W10216360

Part number: W10216360


Here are the breakdown diagrams and Interior and Ventilation parts for Whirlpool WMH2175XVQ1 - AppliancePartsPros.com

Use the attached link to test the hi-voltage components.

Simon.
__________________
Find Appliance Parts at AppliancePartsPros.com - Largest inventory in the U.S. with 91% of all in-stock orders delivered within 2 business days. Thousands of photos and diagrams make it very easy to find the right part. Enter your appliance model here.
Reply With Quote
  #5 (permalink)  
Old 01-29-2013, 10:28 AM
Junior Member
 
Join Date: Jan 2013
Posts: 6
Kenneth Seibold is on a distinguished road
Default

I completely removed the switches to test them. Both terminals were disconnected from any wires when I tested. For the lower switch that I think is the problem, I am sure the terminal is the NO terminal. There is no terminal at the NC label - only one at the NO label. I do know that the switches acted differently, for sure. One had continuity when switch was depressed, and the other (the lower switch) had continuity when the switch was not depressed. I have the lower switch with me now (at work). I am not 100 percent what was the terminal on the upper switch - NO or NC - but I imagine it was NO.

I am not good with electrical stuff. I do not feel very comfortable testing much other than the switches, or replacing something that obviously looks broken. The microwave is only 3 yrs old and cost me about $330. If its not a switch issue, I'll probably buy a whole new microwave.

Can't I test to see if the lower switch was the problem simply by bypassing it and connecting the 2 wires together? Or by connecting the wires to the switch and keeping it unmounted so there is continuity at that switch even when the door is shut? I can't hurt anything doing that, as long as the door is shut, can I? If both switches allow continuity with the door shut, and I heat water, I would think all I need to do is replace the lower switch.
Reply With Quote
  #6 (permalink)  
Old 01-29-2013, 11:12 AM
Simon / APP Team's Avatar
Expert
 
Join Date: Feb 2012
Posts: 5,250
Simon / APP Team will become famous soon enough
Default

Yes, you can bypass that switch temporarily.
First unplug the unit, put the cup of water inside, close the door, bypass the switch, plug in the cord.
Start the MW.
If you open or close the door while the MW is plugged in the fuse may blow.
Find the door switches if you 'll need them in the diagram I've posted previously.

Simon.
__________________
Find Appliance Parts at AppliancePartsPros.com - Largest inventory in the U.S. with 91% of all in-stock orders delivered within 2 business days. Thousands of photos and diagrams make it very easy to find the right part. Enter your appliance model here.
Reply With Quote
  #7 (permalink)  
Old 01-29-2013, 12:23 PM
Junior Member
 
Join Date: Jan 2013
Posts: 6
Kenneth Seibold is on a distinguished road
Default

Thanks. I intend to try the test.

The problem I now have though, is in the diagram. From the diagram, I cannot tell which switch in the diagram is my lower switch. If I look at the individual part pics, it would seem part 18 is the one most like my lower switch, but in the big diagram, it has 2 terminals coming out one end, unlike my switch which has one terminal on top, and one on the end. Part 8 looks like the upper door switch and I did not see another switch while working on it, although there is a part 7 switch which has 3 terminals in the individual pic - not like either of my 2 door switches. Is there a way to tell which switch is upper and which is lower in the diagram? My lower switch has 2 terminals, one at COM and one at NO, coming out the side farther from the actuator, while the label NC is closer to the actuator but has no terminal.

I know my 2 door switches are slightly different in appearance. It appears one may have a terminal at NC and the other at NO, which would mean they SHOULD act differently, which is what my two switches do. Let me ask this, when the door is shut, should the switches BOTH have continuity (0 ohms) - or is it possible one should have continuity and the other no continuity?
Reply With Quote
  #8 (permalink)  
Old 01-29-2013, 01:37 PM
Junior Member
 
Join Date: Jan 2013
Posts: 6
Kenneth Seibold is on a distinguished road
Default

I see another Whirlpool diagram that is very similar to mine.
https://www.whirlpool.com/digitalass...0W10346969.pdf

This diagram has part number SZM-V16-FC-63 in the diagram as part 19 pretty much where part 18 was in the diagram for my microwave model. My lower switch part does have SZM-V16-FC-63 marked on it, so now I know the part I am looking for. But, I am still curious if it truly should have continuity when actuator is not depressed.
Reply With Quote
  #9 (permalink)  
Old 01-29-2013, 02:12 PM
Junior Member
 
Join Date: Jan 2013
Posts: 6
Kenneth Seibold is on a distinguished road
Default

I do appreciate your help, and I don't want to be a pain, but I have more to add. I found a manual from Sears that discussed a Kenmore model that is very similar to mine. On page 24, it has detailed info on the 3 switches, and discussed the NO terminals on part SZM-V16-FC-63, and says the switches should be at 0 ohms when actuator is depressed (door closed).
http://www.appliancefactoryparts.com...s/130524-8.pdf

Unless they used FC-63 in an unusual (incorrect) way in my microwave, it seems it should be 0 ohm but they are not. I guess I will try my test and see what happens.
Reply With Quote
  #10 (permalink)  
Old 01-29-2013, 02:32 PM
Simon / APP Team's Avatar
Expert
 
Join Date: Feb 2012
Posts: 5,250
Simon / APP Team will become famous soon enough
Default

Hi, Kenneth.

I'll explain this again.Please pay attention.

With the door open:

C to NO - no continuity
C to NC - continuity

With door closed:

C to NO - continuity
C to NC - open.

If you get the switch with 3 contacts you can always brake off the one you don't need or just ignore it.

Good luck.

Simon.
__________________
Find Appliance Parts at AppliancePartsPros.com - Largest inventory in the U.S. with 91% of all in-stock orders delivered within 2 business days. Thousands of photos and diagrams make it very easy to find the right part. Enter your appliance model here.
Reply With Quote
See inside of your appliance - diagrams and part photos for virtually every model.

powered by AppliancePartsPros.com
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
How do I remove panel to get to micro switches? Alvin Reed Microwave Repair 1 08-02-2012 06:42 PM
MICRO-Switches repeatedly Burn out TelcoNut Microwave Repair 2 07-11-2012 07:36 AM
Micro wave not heating frazier rental Microwave Repair 0 01-31-2011 04:49 AM
Micro not heating but light on, fan on etc. josh daniels Microwave Repair 0 10-05-2009 05:12 PM
Micro Stopped heating DebnJim Microwave Repair 3 03-24-2008 11:38 AM



All times are GMT -7. The time now is 11:27 AM.

The content on this web site is for informational purposes only and is not intended to replace an on-site diagnosis from a qualified appliance service technician. By reading any content on this site you agree to AppliancePartsPros.com , Inc. disclaimer and Terms of Use.
Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17