MRT21GNBY0 Uni Refrigerator - Instructions

According to the information from the parts select website the thermostat and the defrost timer where ranked number 1&2 as likely to fail and cause the condition experienced. To replace the Defrost thermostat just remove the freezer bins and the lower panel covering the evaporator. Remove the old thermostat, measure the wire lengths and install the provided crimp splices. Note: the heat shrink tubing is WAY over-sized and will not shrink to the size needed. You will need another means of sealing the wire connection. Install the thermostat and replace the panel and shelves. The timer is real easy. On my model it is located under the freezer door under the kick panel on the front. Simply remove 2 Phillips head screws, unplug the old unit and install the new one. Be sure to cycle the thermostat past the defrost cycle on the timer (rotate until an audible click is heard once for the beginning of the cycle and one at the end) so that the unit will start up when power is reconnected. This resolved my problem and the unit is working great!

The instructions given to me by part Select were very good.I replaced the Timer- checked the heater with oham meter it was good- checked the door weather striping it was good and replaced the thermostat with new .So at this point I may need to call a professional unless some one has another solution.

The temperature was slowing rising in the refrigerator section of a side-by-side. As a precaution, I changed out the defrost timer and defrost thermostat. The parts were not expensive. I then tested the defrost heating element with a multimeter and found the actual culprit was a burned out heater coil. I ordered the part one day and it was delivered by FEDEX the next day. The three parts were much cheaper than a new refrigerator and took little time to install, thanks to the Parts Select website and the how-to-install videos. Now the fridge works great and we saved having to buy a new appliance.

Ordered new parts, removed old parts, put in new parts. Done.

The old drain pan had a 1 ½” tall bushing attached to the center of the pan. The new pan did not have this bushing which was great. I had to cut about 1 inch off the bushing to remove the old pan. Also after cutting the bushing I had to screw the bushing off after cutting the old pan from the bushing. I installed new pan onto the ½” of threads that was left on the top of the compressor. Checked repair two days later all was great.

1. Unplug the refrigerator.2. Remove the storage rack and back panel in the freezer. 3. Locate the thermostat. 4. Defrost the freezer coils , i used a hair dryer. 5. Remove the thermostat from the cooling coil and then clip the connecting wires close to the unit. 6. Strip the ends of these wires and connect these wires to the wires of the replacement unit using the supplied wire connectors. 6. Heat seal with a lighter the connections using the water shield sleeves provided and further wrap connections with electrical tape. 7. Reconnect the thermostat to the cooling coil at the location it was removed from. 8. Replace the freezer back panel removed earlierand the storage rack if you have one. 9. Plug the freezer back in. My refrigerator has been working ever since the repair. There are several YouTube videos available that walk you through the diagnoses and repair process. They are very good.

with patience

Part Select suggested probable causes and supplied videos of how to make the repair of a 25 yr.old refrigerator along with the specific parts to order. I was about to trash the old refrigerator but after replacing the parts for a total of about $40 and 1 hour of time it works fine now.

Unplug the refrigerator. You will ultimately need to remove the back panel of the freezer. But first, you will need to unscrew 2 screws on a small vertical fan vent and unscrew two screws on the fan. Maneuver the fan out of the round hole in the back panel and unplug the 3 prong wire connection. Then remove the fan. Unscrew the 4 remaining visible screwson the back pannel and remove the panel. This will expose the freon coils. On this model, the heater has two connections at the top of the coils. Unplug those wire connections. The heater extends down each side of the coils and along the bottom of the coils. Unhook two aluminum ties that connect the heater element to the coils. These ties stabilize the heater element and also prevents any current from flowing along the element because of the touching of two different metalic parts. Maneuver the heater element out of the coils. To install the new heater, reverse the above process beginning with installing the new heater element. If it hasn't already been done, it is good idea to test the old heater element with an ohm meter to make sure that the element is actually bad. The circuit should be open. This is the second heater element that I had to replace on this refrigerator, and it was actually burned in half both times, so I knew for sure the element was bad. Then test the new element to make sure it is good, and start the installation..

dismantled the top rear panel of the freezer and found I had the wrong part. Hand started the fan motor and it has been working fine since.

we removed the food from the freezer, disconnected the fridge , removed the cover, the evaporater fan was running, condeser fan was running, then we checked heater with multimeter and it was ok. next step we replaced the frostimer, and defrost thermostat . and then the refrigarater was working ok, problm was the frost thermastat damaged.

first I replaced the timer control hoping thats the problem,unfortunately situation the same ice build up on the freezer.so I replaced the defrost thermostat.right now I'll still observing the condition if still the same.may be in couple days.so far its good.and to replace the parts is not difficult and easy.

Removed screws that fastened bracket to fridge. Next, I replaced the motor and carefully lined the brackets up so the motor would rotate smoothly. Put the fan blade on the motor and screwed the brackets back on the fridge. Motor kept popping out of alignment while I was screwing the brackets back in but I kept snapping it back in till it stayed.

Unplugged refrigerator. Removed control knob and cover. Unwired control and removed same. Removed plastic tube from old capillary tube and placed on new unit. Installed and wired in new unit, making sure new unit was in the "off" position. Plugged in refrigerator, turned control knob to the first numerical setting, and was rewarded with the startup of the refrigerator compressor. Voila!

bottom left cornerof fridge defrost timer replaced two bolts and a wire