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How to properly replace the thermistors in a refrigerator: an illustrated and annotated guide

Posted by Samurai Appliance Repair Man, in Refrigerator Repair 16 January 2012 · 8,096 views
GE, refrigerator, thermistors and 1 more...
A special treat today, kids: Sublime Master Bob-tech is featured in this week's edition of Techniques from the Masters™ for replacing the thermistors in a GE refrigerator. The technique demonstrated here is on a GE bottom-mount refrigerator but the same technique applies to all brands and types of refrigerators that use thermistors for temperature sensing. The idea is that you want those connections to have as little resistance as possible, ideally less than 1/2 ohm. Samsung, for example, prefers soldered connections but GE also says that using crimp connectors with silicon applied in the open end is okay, too.

The reason that low-resistance connections are desirable is to eliminate inaccuracies in temperature measurements. The thermistor itself is really just a negative temperature coefficient (NTC) resistor (read more here) whose resistance changes with temperature and is read by the control board. So any resistance introduced into the circuit will just result in less accurate temperature sensing by the board. In this case, higher resistance is interpreted by the board as lower temperature. If the additional resistance is high enough, this will result in a warm compartment because the board will interpret that higher resistance as colder temperatures and will not call for the compressor to come on enough to cool the compartment.

By following these Techniques from the Masters™, you'll help assure that you're making a good repair that will not introduce other problems.

You can buy the replacement thermistors with a 365-day return policy here ==> http://www.repaircli...093?RCAID=24038

Here are Sublime Master Bob-tech's field notes on this technique

I finally got around to changing my thermistors.
1. On the evaporator, tie wrapped to the coil.
2. One in the freezer, right side wall.
3. One in the fridge, Ceiling, back-center.

The evaporator thermistor requires the most work to get to, but it's the easiest to work with. The one in the freezer and fridge don't have much wire room to work with.

This job is a little time consuming, but it's fairly easy. All you are doing is getting to the thermistors, cutting out the old and puting in the new.
Note: Thermistors are not polarized....so you can't hook them up backwards.

I strongly recomend soldering in your new thermistors.
I also recomend using heatshrink. Don't use black tape.
For each of my thermistors, I soldered each connection, then I covered the solder joints in RTV. Then I covered each connection with heatshrink. If you go the route of changing these thermistors, you must make a solid connection, and you must secure it. If you don't, then over time the connection will corroid and cause the main board to read incorrect values.

The connetctions for the freezer and fridge thermistor are tight because very little wire length is given to you. I see in the GE technical pdf they use marrets for this service. All I can say is....... good luck. Those marrets better be tiny. Besides... I would never use marrets in a situation like this.

When soldering in the thermistors, make sure the fridge is not plugged in.
Most soldering iron tips are earth grounded!

I also recomend that you test your new thermistors before installing them.
You can do this by placing them in a large glass filled with as much ice and water as possible. This will ensure the closest temperature reference at 0oC/32F.
Let the thermistors sit in the ice water for a good 5-10minutes.
Ensure they are well seated amongst the ice and water.
Then measure the resistance of each thermistor while they are sitting in the ice water.
You should be reading in the range of 14K-15Kohm.

I'll come back and report the status of my fridge when it's been enough of a testing period.

I took a picture of an old and new thermistor to show the difference in body.
In an earlier post in this thread, Jeff indicated that the bullet or rounded end shaped thermistors were problematic. I had the bullet shaped thermistors, so I changed out for the new flat end style.

Here are the pics....



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Source ==> http://appliantology...ss/page__st__20


An inside look at the guts of a refrigerator compressor in action

Posted by Samurai Appliance Repair Man, in Refrigerator Repair 06 January 2012 · 1,480 views

If you've ever looked in your refrigerator's compressor compartment, you've set eyeballs on the compressor, a warm, black, steel ball. Here's an inside look at the guts of the compressor in action. Cool video!



Domos to Sublime Master Santa for posting this in The Dojo.


How to fix a Subzero 550 that repeatedly freezes up the defrost condensate drain

Posted by Samurai Appliance Repair Man, in Refrigerator Repair 05 January 2012 · 1,621 views

The real problem is that the insulation is becoming saturated with water and unable to keep the surrounding area from freezing. You can install this kit as a permanent fix.


Now, here's the kick in the pants: thanks to SZ, you can no longer buy the floor heater thru the link above-- it's left there because at the time of the original post you could and it shows you a photo of the kit. SZ decided they wanted to keep those parts profits in house so you have to buy it thru either SZ or one of their beeotches.

Source: Subzero Mod 550, defrost drain iced up


Why does a refrigerator in a cold garage have trouble keeping the beer cold?

Posted by Samurai Appliance Repair Man, in Refrigerator Repair 20 December 2011 · 1,825 views
Refrigerator, Garage, Porch and 1 more...
Brother DurhamAppiance delivers today's sermon and illumines us. Let's listen...

Outside temps can affect fridges in many ways. The outside cold air is influencing the thermostat located in your fresh food section. When outside temp drops below 55 degrees, the compressor will be off for longer than usual awaiting temps in the fridge to rise. there is a garage kit that can help you....it should work for your frigidaire made kenmore http://www.repaircli...3918301/1037646



Source: Kenmore 253.68889014 too warm in cold garage


How to remove the freezer drawer in a Maytag French Door refrigerator

Posted by Samurai Appliance Repair Man, in Refrigerator Repair 05 December 2011 · 3,941 views

Freezer Drawer
1. Open drawer to fully open position.
2. Remove upper and lower baskets.
3. Remove screws one in each rail marked on side of rail.
4. Lift front of drawer up and out to remove drawer.
5. Set drawer on a padded surface to prevent damage to finish.



Source: MFI2266AEB Maytag French Door






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