Compressor was trying to start and dropping out on the overload. He measured the winding resistance in front of me, and when the reading came back open he did not pretend a relay would fix it.
Rufus G.2026-02-19
Built-in refrigeration
Sub-Zero Sealed System and Compressor Repair
Refrigerant, compressors, condensers and evaporators — the part of the appliance that cannot be diagnosed from a symptom list and should never be guessed at.
Refrigerant work is the part of this trade that genuinely requires credentials. It is diagnosed with instruments, not with a guess.
Symptoms
What people describe
- The unit runs without stopping and never reaches temperature
- Both compartments have gone warm at the same time
- The freezer holds but the refrigerator side has been climbing for weeks
- There is a hissing or gurgling that has changed in character
- The compressor tries to start, clicks and stops
- The unit was fine, then failed within a day of a power outage
Detail
How the job goes
The sealed system is the closed loop that does the actual refrigerating: the compressor, the condenser, the metering device, the evaporator and the refrigerant charge moving between them. It is called sealed because opening it is a deliberate act with legal obligations attached, and it is the one area of appliance repair where a confident guess is worthless.
Two systems, not one
A Sub-Zero built-in of the classic pattern runs two independent sealed systems, one for the fresh food compartment and one for the freezer. That single fact explains the most common call we take. A refrigerator that has gone warm while the freezer stays hard-frozen is not a machine that has half-died. It is one of two systems reporting a problem, and it narrows the diagnosis enormously before we have opened anything.
It also explains its opposite. When both compartments climb together, the fault is more likely to sit outside the sealed systems altogether — the supply, the control board, the condenser they share, or the room the appliance is standing in.
What we do before touching refrigerant
Most calls that arrive described as a compressor problem are not one. In order, we check what the unit is actually holding against what it is reporting, the condition and airflow of the condenser, the evaporator fan, the defrost cycle, the door seals, and the voltage the appliance is receiving. A choked condenser coil produces the exact complaint that a failing compressor produces: runs constantly, never catches up, warm on hot afternoons.
Only when the ordinary causes are eliminated do we take pressures and temperatures and start reasoning about the charge. Our technicians hold EPA Section 608 certification for handling refrigerant, and that is the only certification claim this company makes.
Leaks and the honest answer
If the finding is a leak, the useful question is where. A leak in an accessible run of tubing is a repair. A leak in the evaporator buried inside the cabinet insulation is a much larger job, and on an older unit it is often the point at which repair stops being the right economic call. A failed compressor sits somewhere between the two depending on the unit and its age.
You get that finding in writing, with the cost of the work set against what the appliance is and how old it is. Sometimes the honest recommendation is not to proceed, and we would rather say so than quote a repair that will not pay for itself. There is no benefit to us in selling sealed-system work on a cabinet that is finished.
Storms and starting faults
Northeast Florida sees somewhere in the order of sixty-eight thunderstorm days a year. A compressor that hums, clicks and stops after a bad night of weather is often not a failed compressor at all but a failed start component or a control that has taken a hit. That is a far cheaper repair, and it is worth ruling in or out before anything else is considered. If your built-in is not on a surge-protected circuit, that is worth knowing regardless of what we find.
What happens to the old refrigerant
Recovery is not optional and it is not an upsell. Refrigerant removed from a system is recovered into approved equipment and handled under Section 608 rules. If a technician offers to vent a system to atmosphere to save you time, that is a reason to end the visit.
Terms
The diagnostic is a flat fee and it is credited toward the repair. Nothing is ordered and no labour is billed before you have approved a written estimate. Parts are genuine OEM, labour is warranted 90 days and parts 365 days. We are an independent shop and we work on Sub-Zero refrigeration only.
Nearby
Related
- Fleming Island — Clay County work, from the Doctors Lake shoreline through Eagle Harbor and Pace Island to the older river lots along Hibernia.
- Eagle Harbor — The largest master-planned community on Fleming Island, and a whole generation of built-in refrigerators that went in with the houses and are still running.
- Pace Island — A gated community between Doctors Lake and the St. Johns, where most houses have more than one refrigeration appliance and at least one of them lives near water.
- Hibernia Plantation — Oak-canopy lots with true St. Johns River frontage, houses built one at a time rather than to a plan, and appliances that live under a lot of falling debris.
- Orange Park — The older town on the west side of Doctors Lake, with a housing stock old enough that most of its built-in refrigeration was retrofitted into an existing kitchen.
- When an Older Built-In Is Worth Repairing — When a fifteen-year-old Sub-Zero built-in is worth repairing and when it is not, and what an independent shop looks at before quoting compressor work.
- Storm Season and Refrigerator Control Boards — Northeast Florida sees around sixty-eight thunderstorm days a year. What that does to a Sub-Zero control board, and how to tell a surge from a failed part.
- Two Sealed Systems, One Warm Side — A Sub-Zero built-in has two sealed systems, and they fail in different ways. How to read a warm refrigerator with a freezer that is still holding temperature.
Terms
Before you book
A flat $129 covers the visit and the diagnosis. It is credited toward the repair if you go ahead with the work.
Labour is warranted for 90 days and parts for 365 days from the date of the repair. Genuine OEM parts throughout.
We service Sub-Zero refrigeration only, as an independent shop.
Customer feedback
What owners said after sealed system work work
4.3 out of 5 across 38 customer reviews. Read every one of them.
The unit was running non stop and never quite reaching its setting. He weighed in the charge properly after the repair instead of guessing on gauge pressure, which the last firm did not bother with.
Alaric M.2026-06-27
Both sides had gone warm together, which he explained is unusual on a cabinet with two systems. He gauged it, found the loss, and talked us through what a sealed repair means before we agreed to it.
Juliet A.2026-05-08