An older cabinet that two other shops had told us to scrap. He read the serial plate, sourced the correct evaporator for that run, and it has held its temperature through the whole summer since.
Desmond L.2026-04-11
Built-in refrigeration
Sub-Zero Built-In Warm, Frosting or Leaking
The full-height built-in units that sit flush with the cabinetry — warm boxes, running fans, frost, water on the floor, doors that stopped sealing.
Built-ins are cabinetry as much as appliance. We work around the panels rather than through them.
Symptoms
What people describe
- The fresh food side is warm but the freezer still feels cold
- The unit runs constantly and never seems to cycle off
- Frost is building on the back wall of the freezer
- Water is pooling under the crisper drawers
- The door no longer pulls itself shut over the last inch
- The condenser fan is loud enough to hear from the next room
Detail
How the job goes
A Sub-Zero built-in is designed to outlast two or three ordinary refrigerators, and most of the ones we open are still mechanically sound. What has usually failed is one component inside a system that was built to be serviced: a fan, a defrost heater, a control board, a gasket that has taken fifteen years of Florida humidity.
What we look at first
Two sealed systems sit behind the grille — one for the fresh food compartment, one for the freezer. That is why a warm refrigerator and a cold freezer is such a common call, and why it is rarely the disaster it feels like. It usually points at one side of the machine, not the whole unit.
We start at the condenser. In a built-in the coil sits behind the upper grille where it collects dust, and in a house with dogs it collects considerably more than dust. A choked condenser makes the compressor work against itself, and the first symptom the owner notices is a unit that runs and runs without ever sounding like it has caught up.
From there the checks are ordinary and quick: evaporator fan, defrost cycle, drain line, door seal, and the temperature the box is actually holding rather than the temperature it is reporting.
The two symptoms that get misread
The first is frost that keeps returning on the back wall of the freezer. It gets blamed on the defrost system, and sometimes that is right. But if the frost comes back within a week or two of a manual defrost, the more likely explanation in this climate is a door seal that has stopped making contact, letting humid air in to condense on the coldest surface it reaches. That is a cheap repair being mistaken for an expensive one.
The second is a unit that runs constantly. Owners hear it and assume the compressor is failing. Far more often the condenser cannot reject its heat — a choked coil, a blocked grille, or a cabinet return added above the appliance during a remodel that quietly halved the exhaust path. Nothing has broken; the kitchen changed around the appliance.
Storms and the electrical supply
Northeast Florida sees something in the order of sixty-eight thunderstorm days a year, and built-in refrigeration electronics feel it. A unit that has gone blank, unresponsive, or that hums and refuses to start after a bad afternoon is usually a control or a start component rather than a compressor. We measure the supply voltage under load before condemning any board, because on older kitchens a shared or undersized circuit imitates a failing control convincingly.
Sealed-system work
Refrigerant work is the part of this trade that genuinely requires credentials. Our technicians hold EPA Section 608 certification for handling refrigerant, and a sealed-system diagnosis is never guessed at from a symptom list. If the problem turns out to be a leak or a failed compressor, you get the finding in writing along with what the repair costs and what it is worth against the age of the unit. Sometimes the honest answer is that the repair is not the right call.
Panels and openings
Built-ins are joinery as much as refrigeration. The custom panel, the toe kick, the flush hinge and the cabinet opening around it all have to go back exactly as they came out. On older Fleming Island kitchens the opening is often tighter than the current specification allows, which matters if a unit ever has to come out on its rollers. We check clearance before anything moves.
What the visit costs
The diagnostic is a flat fee and it is credited toward the repair if you go ahead. You get a written estimate before any part is ordered. Parts are genuine OEM, and the work carries a 90-day labour and 365-day parts warranty.
Price bands
What does built-in refrigeration work cost?
These are the bands this kind of fault lands in once it is diagnosed, parts and labour together. The visit comes off whichever line the job turns out to be.
| Work | Typical range |
|---|---|
| $80 diagnostic visit | $80 |
| Evaporator or condenser fan motor | $250–$600 |
| Door gasket or seal replacement | $250–$650 |
| Ice maker, water valve or supply line | $250–$620 |
| Defrost heater, thermostat or sensor | $260–$630 |
Ranges, not quotes: the firm figure is written down after the diagnosis and nothing is ordered or billed until you have approved it. On this page the work we describe runs from $80 for the visit to about $650 at the top of the band above. The whole book of bands is on the pricing page.
Nearby
Related
- Fleming Island — built-ins gone warm — Clay County work, from the Doctors Lake shoreline through Eagle Harbor and Pace Island to the older river lots along Hibernia.
- Eagle Harbor — closers, fans, boards — 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 — wine and undercounter — 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 — access and openings — 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.
- Doctors Lake — humidity and condensation — Both banks of a tidal arm of the St. Johns — waterfront kitchens, boathouse and garage refrigeration, and the humidity that comes with living on the water.
- Orange Park — ice that stopped — 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.
- Sub-Zero Compressor Noise: Normal or a Fault? — A Sub-Zero refrigerator compressor that hums and cycles on and off is normal; grinding, rattling or a hum that never stops while food warms needs a technician.
- 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.
- Where We Start When the Ice Stops — An ice maker that quit overnight and one that faded over a season fail for different reasons. The order we check things in, and why that order saves a visit.
- 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.
- Cabinet Openings and the Route Out — Cabinet openings, clearances and the route out of the room. What a built-in Sub-Zero needs from the kitchen around it, and what older Clay County homes lack.
- How to Read a Door Gasket — Florida humidity is hard on refrigerator door gaskets. How to read a seal that has taken a set, and why frost on the freezer wall is usually a door problem.
- 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.
Asked and answered
Questions about built-in refrigeration
- Why is the fresh food side warm while the freezer is still cold?
- Because they are two separate systems sharing one cabinet. A warm upper compartment with a hard freezer usually points at the fresh food evaporator, its fan or its defrost circuit rather than at refrigerant. We measure both compartments against their setpoints first, because the gap between them tells us where to open the box.
- Is a built-in from the 1990s still worth repairing?
- Often, and the serial number settles it. Fans, thermistors, gaskets, door closers and hinge hardware are generally still available for cabinets of that age. Some of the earliest control boards are not, and where a board has been superseded the replacement can carry a different connector. We check availability against your serial before quoting.
- What does a built-in repair usually cost?
- The $80 visit covers the diagnosis and comes off the repair. A condenser or evaporator fan motor runs $250–$600 and a defrost heater, thermostat or sensor $260–$630; those two account for most of the warm-cabinet calls we take. Sealed-system work is the exception at $870–$2,460.
Terms
Before you book
A flat $80 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. We do not service heating or air conditioning. No furnaces, no heat pumps, no air handlers, no mini-splits and no ductwork. That is a separate trade with its own licensing, and a call about a house that will not cool belongs with an HVAC contractor rather than with us.
Customer feedback
What owners said after built-in refrigeration work
4.3 out of 5 across 62 customer reviews. Read every one of them.
The repair holds and the cabinet is quiet again. What I did not care for was being told the part would arrive at the start of the week and then hearing nothing at all until I chased it myself.
Marcus O.2026-08-06
After the last outage the cabinet came back up and then would not settle. Rather than sell me a control he checked the start components and found a condenser fan motor with a dragging shaft.
Isaac T.2026-07-06