The short answer
On the AWC line, a cabinet that hums but will not hold temperature is far more often an airflow or heat-rejection problem than a dead compressor — the machine is still working, it just cannot move the heat out. On this page the door seal and the condenser coil come before the defrost system, because both can be cleared in minutes and both produce the identical symptom.
What you are seeing on the AWC line
- Frost has built into a sheet on the back wall of the freezer side — Not the usual light dusting — a solid layer that no longer lets air through the vents.
- The freezer side is cold but the fresh-food side is not — On a cabinet that cools both compartments from one evaporator, this split is an airflow symptom, not a thermostat one.
- NEAR MISS — the cabinet is silent and nothing is cold — That is a no-power, start-relay or control fault and it is a different page: it starts with the outlet and the cord, not with the airflow checks below.
Causes, most likely first on the AWC line
- The door is not sealing — gasket, alignment or a shelf holding it open — Ranked first on the AWC line because it costs nothing to check and because it explains the whole symptom: a cabinet fighting a continuous inflow of room air never reaches temperature, runs without cycling, and frosts its coil as a second act.
- The condenser coil is blanketed in dust, or its fan has stopped — Heat has to leave the cabinet somewhere. A furred coil or a stopped condenser fan keeps the refrigerant hot on the high side, and the compartment warms even though everything is running.
- Defrost has stalled and the evaporator has iced over, so no air moves — A stalled defrost cycle ices the evaporator until air can no longer pass it, which warms the cabinet while the compressor keeps working. It sits here because the checks above it are quicker to clear, not because it is rare.
- The evaporator fan has failed, seized or is being blocked — Ranked low here because it is rarely silent about itself: a failing fan usually grinds or ticks before it stops, so a quiet cabinet makes it less likely than the causes above.
Check in this order, and why that order
- First — close the door on a sheet of paper and pull it out — Do it at the top, the middle and the bottom of each door.
- Then — find the condenser coil and its fan, and look — Pull the cabinet out or take the base grille off.
- Only then — look at the back wall of the freezer compartment for a sheet of ice — Empty the compartment and look at the vents.
- STOP here if the next check needs a panel off or a meter on live terminals — Everything above can be done with nothing dismantled; past it the checks need test equipment.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before any panel comes off — a capacitor can hold a charge after the power is off, and the compressor circuit is live whenever the cabinet is plugged in even when it is silent. Do not defrost a coil with a heat gun or a sharp tool: puncturing an evaporator tube turns a service call into a replacement.
Where the owner job ends
Call once the checks above are clean, or as soon as the evidence points inside the sealed system: refrigerant work is licensed work and the gauges to do it are not owner tools. On the AWC line, call rather than continue if the coil has to come out to be cleared, if the fan needs the evaporator cover off, or if the cabinet trips the breaker when it starts. Call the same day if the freezer has been above 0 °F (−18 °C) or the fresh-food side above 40 °F (4 °C) for longer than a few hours, because at that point the food is the more expensive problem.
Other faults covered for the AWC line
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
