ZISB480DNBII General Electric Refrigerator - Instructions

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.

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.

followed part select video 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!