The short answer
On the Amana 4w5j90 refrigerator family, a cabinet that runs but will not hold temperature points at the sensing rather than the cooling, because a control that believes the cabinet is cold shuts a perfectly healthy system down and leaves nothing to hear. The brand-generic article puts a stalled defrost cycle at the top of this symptom; on this platform it sits second, behind causes that are quicker to rule out.
What you observe on these models
- The display shows the set temperature while the shelves do not — What the control believes and what the thermometer says have come apart.
- Frost builds as a sheet on the freezer rear wall — Not the usual light dusting but a solid layer that keeps returning after it is cleared.
- Food at the back freezes while the front spoils — A wide spread across one compartment points at airflow rather than at how cold the machine can get.
- NEAR MISS — water on the floor with the temperature correct — That is a leak, and the cause list for it is a different one.
Causes, most likely first on this family
- Temperature sensor or control reading the cabinet wrong — Top of the list on these models. A sensor drifting warm tells the control the cabinet is colder than it is, so the compressor is commanded off early. Nothing sounds wrong, and nothing is cold enough.
- Defrost cycle stalled and the evaporator iced over — Second. Adaptive defrost degrades before it fails outright, so ice builds on the evaporator over weeks, airflow drops, and the owner notices the warmth long before anyone notices the frost sheet behind the rear panel.
- Evaporator fan motor failed or seized — Third on this platform. Cold air is made in one place and has to be blown to the other. When that fan stops, the freezer side can still make frost while the fresh-food side warms steadily, which reads as a partial failure rather than a total one.
- Sealed-system fault — a refrigerant leak or a restriction — Last, and the only one of the four here that is not owner work. The compressor runs and the coil never gets properly hot, or gets hot in one patch only. It is the one cause on this list that is licensed work rather than owner work.
Check in this order, and why
- Read what the control believes the cabinet is doing — Start here. If the display claims a temperature the cabinet plainly is not at, the sensing is the fault and nothing downstream is.
- Take the freezer rear panel off and look for a frost sheet — Then this. A solid sheet across the evaporator is the airflow answer; a light dusting is normal and means keep looking.
- Listen at the freezer with the door held open and the switch pressed — Third. The fan should run. Silence with the switch pressed separates the two commonest causes before a panel comes off.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel; a capacitor can hold a charge after the power is off.
Models covered by the 4w5j90 family
Reference| Model number | Family key |
|---|---|
| 4w5j90-07 | amana:refrigerator:4w5j90 |
| 4w5j90-08 | amana:refrigerator:4w5j90 |
| 4w5j90-09 | amana:refrigerator:4w5j90 |
| 4w5j90-10 | amana:refrigerator:4w5j90 |
| 4w5j90-11 | amana:refrigerator:4w5j90 |
| 4w5j90-12 | amana:refrigerator:4w5j90 |
| 4w5j90-13 | amana:refrigerator:4w5j90 |
| 4w5j90-14 | amana:refrigerator:4w5j90 |
| 4w5j90-15 | amana:refrigerator:4w5j90 |
| 4w5j90-16 | amana:refrigerator:4w5j90 |
When to call a technician
Call once the owner-side checks above are clean, and call straight away if the fault is on the sealed system: refrigerant work is licensed work and the tools for it are not owner tools.
The other faults covered for this family
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