ZISS420NNBSS General Electric Refrigerator - Instructions

What an awesome site! After putting in my model number and finding the problem I was having, I simply picked the 2 parts that were most likely to solve the problem. I bought a defrost thermostat, and defrost heater. To a high certainty, they would solve my problem. They didn't however! I ended up having to buy a temperature sensor on another order a few weeks later when the problem resurfaced! My own fault. I should have bought it the first time. As others have written: the longest part of the job is defrosting the ice from the coil. One thing I did that I didn't see suggested: plug the drain hole below the coil. I put a couple towels in the bottom of the freezer and ran the hair dryer. Didn't take long. I read that the amount of water created will overflow the pan under the refrigerator, so I plugged the drain hole. Once you clean that mess up, the repair is pretty straight forward. Great site. Even through I had to make two separate purchases, I still saved a lot of money. Thanks!

Very limited working space in this model. Must remove grill and disconnect elect connector on motor. One additiional tool suggested: Extendable rod with magnet on end because you will most likely drop something. First, remove two screws holding motor to metal strap. Tool must be inserted between blades of fan in order to get to the screws and this is the hard part. Fan and motor are removed as one assy and this takes some manuvering. Might have to remove front screw on metal strap to gain more room. I did not attempt to remove fan shroud. My fan was attached to the motor shaft with a metal clip. Spray a good lubricant such as PB Blaster on the shaft, wait a few minutes and press it or tap it out gently. Save misc parts on old motor for reassembly. Your set up may be different so check out everything before starting.

I have a GE Profile French door refrig. It's only about 4 yrs old and the defroster stopped working. I read the other repair stories and was able to narrow it down to either the temp sensor, defrost timer, or main board. The refrig section was up to about 47 degrees and freezer was around 25. I could tell it was trying to cool but couldn't. So I tried the temp sensor first. I cut and spliced the new sensor on the outlet of the Evap. Coil and it took about 15 mins. Turned refrig back on and waited. The coil started to ice over after about 5 hrs I left the back panel off so I could see if and when then heater kicked on. After about 8 hrs I looked in and saw a faint glow and water trickling down and running out the drain. Turned out the sensor was bad and wasn't telling the main board it needed to defrost. I would try the sensor if you are having the same issues before spending a lot of money on the main board, defrost heater and or timer.