Service manual

[John Converse]

Manufacturer: Sub Zero

Type of Appliance: Refrigerator

Model Number: 550

Have you validated the model number at an online parts site like Repair Clinic? (yes or no): Yes

Have you watched the video on how to search for manuals and have you searched the Downloads section prior to posting this request? (yes or no): Yes

Looks like a defrost problem . Having never worked on a Sub Zero woild appreciate some helpful tech info. Thanks 

[Captain Dunsel]

You should be able to use this.Page 135 is the  start of the wiring diagrams:

 

[John Converse]

Thanks Captain. That will go a long way.Seems pretty basic. The size makes them intimidating.