The Short Answer
When a refrigerator stops cooling, cold air is either not being made or not being moved. Making cold is the sealed system: compressor, evaporator, condenser and charge. Moving it is the fan and damper. Between them sits the defrost circuit, which clears the frost that would otherwise choke airflow, and the control board that decides when each part runs. Work through them in that order and the cause usually reveals itself.
Start with the Quick Checks
Before booking, rule out the simple things. Confirm the unit still has power and has not tripped a breaker. Make sure the temperature setting was not bumped by a resting elbow or a child. Check that the condenser area behind the lower grille is not packed with dust, and that nothing is blocking the interior vents. If the fresh-food side is stacked wall-to-wall, air cannot circulate. If none of that explains it, the fault is internal.
Notes by Brand
The luxury roster we work on splits into a few design families, and a warm box behaves differently depending on which one you own.
- Sub-Zero and dual-system built-ins: two independent sealed systems mean the freezer can stay hard while the fresh-food side drifts to the fifties. That points at the fresh-food evaporator, its fan, or a defrost fault on that side, not a total failure.
- Thermador, Liebherr and True Residential columns: a single dedicated system per column, so a warm column is usually its own fan, thermistor or a frosted evaporator behind the rear panel.
- Miele MasterCool and Monogram built-ins: electronic controls will often log a fault before the box feels warm. A sensor reading out of range can shut cooling down as a protection.
- Viking, Jenn-Air and KitchenAid built-ins: the evaporator fan and defrost heater are common culprits, and a frosted-over coil is easy to mistake for a dead compressor.
Symptom to Cause
| What You See | Likely Cause | What We Check |
|---|---|---|
| Both compartments slowly warming | Compressor, start Reddingnents, or low charge | Compressor draw and sealed-system pressures |
| Freezer cold, fridge warm | Evaporator fan or a blocked defrost | Airflow, fan motor, defrost heater and thermostat |
| Runs constantly, never cold enough | Dirty condenser, poor door seal, or thermistor | Condenser cleaning, gasket seal, sensor readings |
| Warm after a power event | Control board or tripped protection | Board diagnostics and reset of the cooling logic |
| Ice sheet on the rear inside wall | Failed defrost heater or control | Defrost circuit continuity and cycle timing |
Before You Dig In
If you smell anything burning or see scorched wiring near the compressor or control board, unplug the unit and book a visit rather than resetting it repeatedly. Repeated hard restarts of a struggling compressor can turn a fan-motor repair into a sealed-system job.
What We Do on Site
We confirm the symptom, read any stored fault, and test the airflow path before touching the sealed system, because a frosted evaporator mimics a dead compressor. If the charge is genuinely low we trace the leak rather than topping it off, since a recharge on a leaking system is a temporary fix. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.
Food Warming Up?
Book a diagnostic visit. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.
Frequently Asked Questions
How Long Should I Wait Before Calling About a Warm Refrigerator?
If the box is still warm after four to six hours with the doors kept closed, stop waiting. Move perishable food to a cooler and book a visit. A unit that has genuinely lost cooling will not recover on its own, and the longer a compressor struggles the more it can cost.
Can a Refrigerator Freezer Be Cold While the Fresh-Food Side Stays Warm?
Yes. On a dual-system built-in each compartment has its own sealed system, so the freezer can hold while the fresh-food side drifts warm. On a single-system unit it usually points to the evaporator fan or a blocked defrost that has stopped air from reaching the fresh-food compartment.
Is a Refrigerator That Is Not Cooling Worth Repairing?
For a built-in or integrated unit, almost always. A fan motor, defrost part or control board is a modest repair against a replacement that can run well into five figures once cabinetry and installation are counted. We give a written estimate so the numbers are in front of you.
Related
Temperature Swings
When the box cools but will not hold a steady number.
Refrigerator Repair
Full diagnosis and repair for built-in refrigeration.
Failing Compressor?
The signs that separate a dead fan from a dying compressor.