Page 4 of 5 FirstFirst ... 2345 LastLast
Results 31 to 40 of 46

Thread: FIXED: ZISS420DRJSS GE Monogram side by side built-in doesn't hold temperature

  1. #31
    Join Date
    Dec 2018
    Location
    Orange County, CA
    Posts
    13

    Default

    As I stated, my defrost thermostat is reading slightly above 1 ohm temperature below 65F, then becomes open circuit above 65F. My multi-meter is a dirt cheap one, which may not be accurate. What is the spec value? Is above 1 ohm means faulty thermostat?

  2. #32
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    32,361

    Default

    Quote Originally Posted by sungpark View Post
    ...defrost thermostat is reading slightly above 1 ohm temperature below 65F,...
    Here's the part you need: WR50X29776 Thermostat Cutoff
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  3. #33
    Join Date
    Dec 2018
    Location
    Orange County, CA
    Posts
    13

    Default

    Rick,

    I'm getting closer to find the frost buildup root cause. I think the reason defrost thermostat is reading above 1 ohm is because of my cheap multi-meter. I will try to use fluke meter at work to get exact resistance reading.

    As I stated in post #28, in the process of removing freezer section, I noticed very heavy ice buildup in the drain pan area, and noticed heater element at the bottom of the pan, which I suspect it's not working.

    Here's the part: https://www.appliancepartspros.com/ge-icing-kit-wr49x10021-ap2636547.html

    Is there a way to check the drain pan heater resistance through one of motherboard connectors? I highly suspect this is the culprit. I gave up accessing/replacing defrost heater, but drain pan heater element changes can be done I hope.

    As always, your help is greatly appreciated. Thank you.

  4. #34
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    32,361

    Default

    J12 - J7-9 is the drain pan heater. You're making this a lot harder that it needs to be. If the defrost heater is not turning on, as you already stated, the problem is either the defrost thermostat, the defrost heater or the motherboard. It has to be one of those three components. As I already stated, if you read an open circuit between between J9 and J7-9, the problem is either the defrost heater or defrost thermostat.
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  5. #35
    Join Date
    Dec 2018
    Location
    Orange County, CA
    Posts
    13

    Default

    Rick,

    I took some break from my refrigerator troubleshooting, but have not given up yet.

    I might have given you wrong information in my previous post, mainly because I wasn't sure what I was doing, but let me summarize what I have done/tested so far:
    -Defrost thermostat (L65-20F): Open circuit above 65F, and showing continuity below 65F. The unit checks out OK.
    -Defrost heater: J9 blue connector to J7-9 connector side: 38 ohm. The unit checks out OK.
    -Drain pan heater: Removed the unit and the resistance is reading ~330 ohm. I thought this was the culprit, so purchased a new unit, but reading the same resistance. Do you know the correct resistance reading?
    -Cleaned out drain line. It was somewhat blocked with curd, but not completely.

    I put back together turned on the unit today. I have not installed a new drain pan heater yet, since it's reading the same resistance as my original unit. I will observe if ice is building up in the drain pan again. Any suggestions are greatly appreciated.
    Thank you.

  6. #36
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    32,361

    Default

    OK Let's start over. The drain pan heater is good (330Ω). J12 - J7-9 I marked it on this diagram. It might not be in the exact same location but it's marked J12. Measure the resistance of the evaporator thermistor in the J1 connector. Disconnect the connector and put you meter leads J1-4 and J1-5. A thermistor is a variable resistor that changes value with temperature.

    The evaporator temperature can be as low as -30F or as high as +40F and the thermistor needs to be checked at a known temperature. Remove the thermistor from the evaporator and let it hang down. Put the thermistor in a small glass of crushed ice and just enough water to cover it. Wait a minute or two then measure the resistance on your meter. At 32F the thermistor should show 16.3K ohms (16,300Ω).

    If the thermistor checks good and the defrost thermostat and heater check good, the board must be bad.

    WR55X10560 Board Asm Main Contro


    Click image for larger version. 

Name:	GEMB-03 Defrost Test.jpg 
Views:	7 
Size:	331.3 KB 
ID:	41384Click image for larger version. 

Name:	GEMB-04 With Inverter.jpg 
Views:	8 
Size:	398.2 KB 
ID:	41385
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  7. #37
    Join Date
    Dec 2018
    Location
    Orange County, CA
    Posts
    13

    Default

    Rick

    I ran the my refrigerator for couple of days to check the ice buildup on the drain pan, and sure enough, it started collecting some ice. Measured drain pan heater resistance again at J12 - J7-9, and reading 345 ohm. Is this considered ok, or too high?

    Next, I checked the evaporator thermistor reading at J1-4 - J1-5, reading 16 kohm. I measured ~20 to 30 min after unplugged at 0F, so the temperature shouldn't have gone up to 32F yet. I'll leave it unplugged and check the resistance again at room temperature. According to the chart you provided, it should read 6.5 kohm at 65F (post #26).

    So, I'm now suspecting evaporator thermistor is not reading the correct temperature. I need your help here. Where is it located for my model? I located the evaporator thermostat, but was not able locate the thermistor. Please help!!!

  8. #38
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    32,361

    Default

    It should be right next to it. I marked it in this picture. Pull it out of the clip and you'll have enough play in the wires to test it the way I described in my last post.
    Click image for larger version. 

Name:	evap thermistor.jpg 
Views:	14 
Size:	218.2 KB 
ID:	41423

    Check it like this if it tests out of range at the board then use a couple wire nuts or black tape to install it. You'll need to cut the wires to replace it.
    Click image for larger version. 

Name:	Thermistor Testing.jpg 
Views:	5 
Size:	30.7 KB 
ID:	41424
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  9. #39
    Join Date
    Dec 2018
    Location
    Orange County, CA
    Posts
    13

    Default

    Thank you so much for the picture. It has been 3-4 hours since unplugged, and still reading 16 kohm. Will check again after reaching room temperature.

    For the drain pan heater, is 345 ohm considered within the range, or too high?

  10. #40
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    32,361

    Default

    That's less than 5% so I'd say it's good.
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

Page 4 of 5 FirstFirst ... 2345 LastLast

Similar Threads

  1. Replies: 20
    Last Post: September 10th, 2017, 10:44 PM
  2. Replies: 10
    Last Post: May 9th, 2017, 04:13 PM
  3. Replies: 1
    Last Post: April 26th, 2017, 06:55 PM
  4. built in GE Monogram side by side
    By glandeche in forum GE/Hotpoint
    Replies: 1
    Last Post: March 11th, 2012, 01:29 PM
  5. [FIXED] GE side by side temperature issues
    By jerkyboy in forum GE/Hotpoint
    Replies: 11
    Last Post: April 12th, 2009, 09:49 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
If you feel that you have benefited from this site, and would like to show your appreciation, you can throw a buck or two in the Appliance Blog Tip Jar - Thank you!