Stage 1: Power and Controls on a Sub-Zero

A built-in cabinet that is not running looks exactly like a built-in cabinet that is running badly, and the two are separated at the receptacle, not at the compressor. That is why this stage comes first, and why it takes ten minutes rather than an hour.

What gets checked, and in what order

Supply comes first: is there voltage at the outlet the unit is plugged into, and is the breaker that feeds it doing what it should. Built-in refrigeration is normally fed from a dedicated circuit, and the receptacle for it usually sits behind the cabinet or inside the surround, where nobody has looked at it since installation. It is also, frequently, the circuit somebody shared with an island outlet during a later renovation.

Then the control: does the display respond, does it respond consistently, and what happens through a full power cycle. A control that lights up and forgets its setpoint, a control that responds only intermittently, and a control that is completely dark are three different findings, not one.

Then history. When did it last work properly, and what happened between then and now. That question sounds like small talk. It is not.

Why the outage question matters here

Around 68 thunderstorm days a year cross this part of north-east Florida. The damage they do to appliances is not mechanical — a compressor is a fairly blunt object, and a nearby strike or a supply transient does not usually reach it. Control electronics are a different matter.

The pattern worth knowing is the delayed one. The multi-day outages that came with Matthew in 2016, Irma in 2017 and Helene in 2024 did not produce a wave of appliance failures the same week. They produced failures over the following weeks, in cabinets whose owners had long since stopped connecting the two events. A board that took a transient does not always stop; sometimes it starts behaving oddly, resets at random, or loses one function while keeping the rest.

So if a cabinet has gone strange since an outage, that belongs in the first two minutes of the phone call. It changes which stage we expect to find the answer at, and it changes what travels on the van.

What finishing this stage rules out

That a dark or unresponsive cabinet is a refrigeration fault. Quoting a control or supply problem as a sealed-system repair is the single most expensive mistake available on a first visit, and it happens because the technician started at the interesting end instead of the cheap one.

It also rules in something useful. If the unit powers up cleanly, holds its settings through a cycle, and drives its fans and lights as it should, then every later stage is being measured on a cabinet that is genuinely trying to work — which is the only condition under which those measurements mean anything.

What we ask you to have ready

The model and serial number from the rating plate. On built-in refrigeration that plate is inside the cabinet, usually on an upper side wall or behind the grille, and the serial number matters more than most people expect: it is what decides which version of a control or a valve actually fits. Two cabinets that look identical across a kitchen can take different parts.

If the serial is unreadable — and after fifteen years in a humid kitchen some are — say so. There are other ways to identify a cabinet, but they take time, and knowing in advance is the difference between one visit and two.

Scope

We work on Sub-Zero refrigeration only, and we are an independent company with no manufacturer affiliation. Where a fault sits inside a control that is still covered by the original manufacturer terms, we will tell you that rather than quote for it — there is nothing in it for us either way, and it is your money.

The diagnostic is $129 flat, credited toward the repair if you go ahead, with a written estimate before any part is ordered.

$129 flat to diagnose, credited toward the repair if you go ahead with the work. 90 days on labor, 365 days on parts. Pricing · Warranty · Contact