Eric K Fountain Valley , CA December 08, 2023 Appliance: General Electric Refrigerator ZISS420DRESS No code Compressor not running. Check power going to it and nothing. Tested ohms on the compressor. 8-10 ohms approx Lights and display all working normal so I assumed the main board was ok Replaced the inverter board. Confirmed there was 4-5bdc on the red and white trigger plug on the inverter. It’s a waveform that is there also but having voltage on the red and white wire of the inverter is a good sign the mother board is ok. I wanted to confirm the damper door was working properly. The damper is located on the top right side of the freezer compartment and it’s harder to confirm it’s functioning from the refer or food compartment side. Tested the 2 temp sensors and replaced anyway as a precaution. You have to cut out and re soldier them back in a shrink tub the connection for a clean install. You can use gray twist caps if you don’t have soldier. I replaced the main board as a preventative maintenance. Read More... Do-It-Yourself Rating: Repair Time Estimate: 2+ hours Tools: Pliers, Screwdrivers