This is the repair people arrive already braced for. The cabinet is warm, the machine is audibly running, and somebody — a neighbour, a forum, occasionally a previous technician — has said the word compressor. It is the most expensive thing in the box, so it is worth being slow about. The band is in the table below rather than saved for the doorstep, because a household deciding whether to call deserves to see the worst case first.
A running compressor is evidence, not a verdict
A compressor that will not start announces itself. What we are usually sent to is the opposite: a unit that runs and runs and still gives temperature away. That is a machine failing to reject heat, and there are four ordinary explanations sitting above the sealed system in the order of work.
Heat rejection. A condenser matted with pet hair and the fine dust an air handler circulates for most of a Florida year leaves the compressor pumping against a head pressure it was never sized for.
Airflow. An evaporator fan that spins freely by hand and stalls under load, or a duct that the loading of one shelf has closed off.
Defrost. An evaporator carrying frost is holding its capacity behind a blanket. The cooling is being made; it cannot reach the compartment.
The doors. A seal that has taken a set drags humid air in all day and makes every reading above it look worse than it is.
Only when those four are measured and cleared is the sealed system the remaining answer. Fitting a compressor before that point buys a household the most expensive part in the machine and the symptom it started with.
What the sealed system actually fails at
Three things, and they are not the same job.
A leak: the charge goes somewhere, and the cabinet cools progressively worse, often half-recovering overnight. The leak has to be found and closed, because a system recharged without that is a return visit already booked.
A restriction: the charge is present and cannot move. That produces frost on part of the evaporator and none on the rest — one of the few symptoms in this trade that names its own cause.
The compressor itself: worn, seized, or running without pumping. It is the smallest share of the three and the one everybody names first.
All three mean opening a sealed system, which under federal law is work for EPA Section 608 certified technicians. That credential is about refrigerant handling and nothing else — it is not a manufacturer appointment, and this company does not hold one.
Two sealed systems, one reading
Many of these cabinets run two independent systems, one per compartment. That is why a household can lose the fresh-food side completely while the freezer stays hard, and it is also why “the whole machine is going” is usually wrong. Two systems do not fail together. When both compartments drift at once the cause is almost always something they share: the condenser, the clearance around the cabinet, the supply, or the control commanding them.
So the split gets read before anything is opened. It halves the work, and on the most expensive repair in the book, halving the work is the point.
Against the cost of not repairing it
The second table below is the other side of the comparison: what a comparable built-in costs as an appliance, before delivery, before installation, and before the panels and trim a fitted opening needs. Set the sealed-system band against it and the question mostly answers itself, which is not the answer people expect from the largest number on our price list.
What moves it the other way is history rather than age. A cabinet with one failed system and twenty good years behind it is a repair. A cabinet whose sealed system has already been opened once, or that has produced three unrelated faults inside a year, is where replacement earns its hearing. The longer version of that argument, including where the fifty per cent rule does and does not apply, is in the note on repairing or replacing a built-in.
We do not sell replacement units, which removes the obvious reason to talk a household into one. It also means that when the money would be better spent elsewhere, we can say so on the day — with the readings that led there written down for you to take anywhere.