ZISS420NXCSS General Electric Refrigerator - Instructions

took out shelves and removed the back plate my removing 2 screws with a nutdriver.removed the old defrost timer and defrost heater which was really easy.then installed the new ones.the video i watched on the website was really helpfull.

I can't tell you how luck I feel after finding your website I ordered the temperature sensor after watching one of your videos on-line and the repair went just as on the video. I pulled the "bad" sensor out, and replaced it with the new one. Keep in mind that this is the first time I ever touch an appliance, needless to say I'm feeling pretty good about that! All in all it took me about 20 minutes to complete my repair and it now has been about 4 days and the refrigerator is working like new again!

I identified the noise was coming from the coils / and the fan. Cleaning the fan helped reduce the noise a bit but it still kept recurring. I ordered the part, which was really easy using the diagram on the website. The instructions and the video were really helpful and was able to remove the old motor and replace it with the new one with relative ease. While there I cleaned the fan blade and vacuumed the surrounding area. This whole repair went quite smoothly and has given me the confidence to take on other repairs before calling out the repairman.

changed sensors did not repair problem,replaced damper with mechanical damper fixed problem.

luckly i have a bit of experience in refrigeration im an hvac technician by trade. this repair was a bit tricky in that i did not know at first if it was a Temperature Sensor issue or the main control board. I had tested the defrost termination thermostat and the defrost heater and as i suspected they were ok. Next i wanted to test the thermistors (temp sensors) it is hard to find technical data on these fridges. I needed to test the thermistors resistance @ a certian temperature to ensure they were working properly but where do u get such data? I also wanted to know some information about the logic programmed into the board (i.e when do you initiate defrost etc. . .). I had no such luck so i figured since i tested the defrost heater and thermostat and they were ok and all of the evap fans and such were working i'd order a circuit board and new thermistors. Got the CORRECT PARTS from this site in 2 business days and my fridge is working great! changing the parts was really easy, figuring out which parts to change was the only difficult thing about this job.

followed part select video instructions

Followed the repair video, was spot on!!

My refrigerator was making a high pitched kind of howling noise. The PartSelect symptom that was closest was “unusual noise” and when I clicked that it said the evaporator fan motor fixes the symptom 32% of the time. Since my freezer fan speed sounded like it was constantly changing I went ahead and bought one which PartSelect delivered promptly. The installation video was great and although my freezer was not identical to the one in the video, the video was still very helpful. The only thing it didn’t say was how to tell if my freezer motor was the one with the thermistor although I suspect that they all are and that PartSelect is simply trying to save us money by showing us how to splice in a motor without a thermistor. Anyway, since I would have had to disassemble the freezer before buying the part to find out for sure, I just bought the one without the thermistor. This just meant I had to splice the new motor in, just like in the video. I think I would have preferred buying the motor with the thermistor even though it was more expensive. In the end my problem is solved so I’m happy. This is the third time that I’ve had to repair this GE refrigerator and PartSelect has been a valuable resource each time.

Replaced above parts and the noise problem was not resolved. Ordered a new motor, fan blade and another set of grommets from PartSelect. The parts were delivered the next day. Took me about 15 minutes to swap the new parts in. It's been 3 days since the repair and the noise has not returned.

Had to remove all the covers and fans to expose the condenser, which was difficult as the parts were frozen to it. The styrofoam covering the condenser made it almost impossible to defrost it. Therefore, I ripped the styrofoam off to expose the condenser. Was not really difficult to fix the styrofoam cover using metal tape. Replaced temperature sensor in aluminum block, and used butyl sealant to secure. Had to also re-install parts of ice-ball kit that were not well covered. Lots of parts to keep track of, but anyone could do it.

had to rewire the harness in place in freezer. should have removed door for more room to work . easy job if you have 4 foot arms and a 1 foot chest.

1. Removed and tested defrost heater, tests good. 2. Reinstalled defrost heater. 3. Removed and tested defrost over-temperature sensor, tests good. 4. Reinstalled over-temperature sensor using soldering iron, dielectric silicone grease, and heat-shrink tubing. 5. Removed the control printed circuit board and checked for blown fuse's, fuse's are all good. 6. Removed the defrost relay from the printed circuit board using soldering iron, bench tested the relay, it is good. 7. Soldered defrost relay back onto the circuit board, and reinstalled control board. 8. Removed and bench tested evaporator thermistor, the resistance is out of specification, ordered new thermister. 9. Installed new thermistor using soldering iron, dielectric silicone grease, and heat-shrink tubing. 10. Re-assembled refrigerator. 11. Installed temperature monitoring and recording instrumentation for 72 hour test. The defrost cycle is running correctly with a defrost termination temperature of around 90 deg-f. The defrost cycle ran twice while running the 72 hour test. 11. Removed test instrumentation and Put the unit back into service, The thermistor was the culprit. I bought the right part on the first shot, nice.

After replacing the Defrost Thermostat, Defrost Heater Assembly, and the Main Board, I concluded that the problem must be the Defrost Thermistor, which I replaced in less than 10 minutes and it fixed the problem! I cut the wires on the old thermistor and connected the new one after stripping the wires and taped the new connections with electrical wire. Fast and easy repair (the last part anyway ;).

I ordered 3 temperature Sensors Part#PS304103 and viewed the video. Got there, opened the frig. and it looked totally different and no place in any part of this frig. that took these sensors as viewed on the video. Totally baffled why these parts were listed for this frig. there was no place in this frig that would access for these parts. Serial # was HR443071.Maybe this model is out of date for these parts. Trying to find someone who can repair it. Any ideas???Purchased this GE in 2008. Model #is GSS25WSTFSS Thanks, for your help. JIM

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!