The short answer
On the RMS refrigerators this is almost never the compressor, which is the part owners assume first and the part that fails last. The cabinet warms while the unit keeps running because something has stopped heat leaving the box or stopped cold air reaching the food, and on this build the airflow path and the defrost cycle come first. Two of the likely causes are owner-checkable without a tool; one is not.
What you observe
- The cabinet is warm but the unit is clearly running — You can hear the compressor and feel vibration at the cabinet, and the air inside is still not cold. That combination rules out a dead unit and points at heat transfer.
- The compressor barely cycles off — A healthy unit rests between runs. One that never rests is chasing a setpoint it cannot reach, which is the same fault seen from the other side.
- NEAR MISS — the unit is silent and nothing is cold — If there is no hum at all, this is a power, start-relay or control fault and it is a different page. A reader who sees silence should leave this one.
Causes, most likely first on the RMS models
- The defrost cycle has stalled and the coil is iced over — Ranked first on a fan-forced build: the coil ices gradually, the fan keeps pushing against a solid block, and the owner notices warmth weeks before noticing frost. It is the most common cause here and one of the cheapest.
- The evaporator fan is not turning — Second: the fan lives behind the same rear panel and is the part that wears on this build. It produces an identical warm cabinet but without the frost sheet to show for it, which is how you tell the two apart.
- The door is not sealing — Third: a gasket that has taken a set, a misaligned door or a shelf holding the door a hair open loads the system with humid room air, which feeds the ice that caused rank one.
- The condenser coil is choked — Fourth here: a dust blanket raises head pressure and costs capacity, but on this build it usually degrades cooling rather than stopping it outright.
Check in this order, and why
- Listen at the freezer for the evaporator fan — Do this first because it splits the two likeliest causes before a single tool comes out: fan running plus frost sheet means defrost; no fan means fan.
- Look at the rear panel for a continuous frost sheet — Second, because it confirms what the listening test suggested and it costs only the time to unload a shelf.
- Close the door on a strip of paper at several points — Third: the seal test is free, and a leak found here explains the ice you just looked at rather than competing with it.
Before you open anything
Safety
Unplug the refrigerator or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Do not chip ice off a coil or a plate with anything metal: the tubing behind it is thin-walled, and a puncture turns a cheap repair into a sealed-system replacement. Refrigerant work is licensed work; if you find oil outside the tubing, stop and call.
When to call a technician
Call once the owner checks above are clean, or the moment the evidence points at the sealed system. On the RMS models the honest line is the rear panel: clearing frost, cleaning a coil and testing a seal are yours, and anything that needs a meter across a heater, a sensor or a compressor winding is not. Call immediately if you smell burning, see oil at the compressor or find the cabinet hot to the touch at the sides — each of those costs more for every hour the unit keeps running. A refrigerator holds food safely at 40 °F (4 °C) or below and a freezer at 0 °F (−18 °C) or below; if the cabinet has been above that for hours, deal with the food before you deal with the machine.
Nearest pages of this class
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
