The short answer
On the NPYYA 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 evaporator fan is checked first, because it is the one cause you can confirm or dismiss by ear in under a minute.
What you are seeing on the NPYYA line
- 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.
- The compressor runs and never cycles off — Continuous running with a warm cabinet says the system is working and losing — either the heat is not leaving or the cold is not circulating.
- 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 NPYYA line
- The evaporator fan has failed, seized or is being blocked — Ranked first on the NPYYA line because it is audible: with the door switch held in, either the fan runs or it does not, and that single check splits the whole list in two before anything is dismantled.
- 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 door is not sealing — gasket, alignment or a shelf holding it open — A door held fractionally open by an over-packed shelf, a tired gasket or a cabinet out of level loads the system permanently. It sits here because it is quick to clear, and clearing it stops you chasing a part that is fine.
- The condenser coil is blanketed in dust, or its fan has stopped — Near the bottom here only because the cabinet in this family is easy to check at the coil — if the grille is clean and the fan turns, this is off the list in a minute.
Check in this order, and why that order
- First — listen at the freezer with the door switch held in — The evaporator fan should start within a few seconds.
- Then — look at the back wall of the freezer compartment for a sheet of ice — Empty the compartment and look at the vents.
- Only then — 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.
- 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 NPYYA 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 NPYYA line
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
