Sub-Zero repair in Medfield

• Model and serial from the plate, usually inside the fresh-food door on the left
• What the display is showing, including any alarm and how long it has shown it
• Whether the freezer side is still holding while the refrigerator warms
• Whether the drift recovers overnight or gets steadily worse
• When it started, and whether anything changed in the house at the same time

That list is short on purpose. Those five answers rule out most of the candidate list, which means the likely part is on the van instead of on order.

Evaporator and condenser fan motors, defrost heaters, thermistor sets, door gaskets and hinge hardware account for a large share of what actually fails on a built-in, and all of them are stock items. Control boards and sealed-system components are not, and no honest preparation makes them so — those get quoted and ordered after the diagnosis rather than carried on spec.

Some cabinets are worth a compressor and some are not. A twenty-year-old unit that needs sealed-system work and has a fan and a board beginning to go is a replacement conversation, and it is one you should have before any parts are ordered rather than after. We will give you that assessment straight on the first visit, including what a replacement of the same size and format would actually involve.