The finding, first
A warm cabinet with an audibly running unit points at airflow first on this roster, and at the sealed system last. The evaporator frosts over, the air path closes, and the cabinet warms while the machine works harder than ever. Two of the three likely causes are checkable by the owner in a few minutes; the third is not an owner job at all. Where this page says "on this family" it means every listing in the table above, not a subset of them.
What you actually see
- The cabinet is warm but the unit is plainly running — The compressor hum is there and steady; the air inside is not cold. That combination is the whole page in one observation.
- A sheet of frost across the back wall of the freezer — Not the usual light dusting that comes and goes, but a solid layer that does not clear between cycles.
- The freezer holds and the fresh-food side does not — On a single-evaporator cabinet the fresh-food side is fed by air from the freezer, so it fails first when that air stops.
- The freezer holds and the fresh-food side is only slightly warm — A partial airflow loss, usually the beginning of the ice build rather than the end of it.
- NEAR MISS — the cabinet is cold but the icemaker is empty — Cold air with no ice is its own fault path and has its own page for this family.
Causes, most likely first on this roster
- Airflow blocked by a frosted evaporator — First on this roster, and by some distance. Adaptive defrost on these cabinets stalls before it fails outright, so ice accumulates over weeks and the owner notices the warmth long before the frost.
- Evaporator fan motor failed or obstructed — Second. The fan lives behind the freezer rear panel on this platform, which is where the ice forms, so a fan that has been fighting frost for months is a fan near the end of its life.
- Defrost heater, thermostat or timer fault — This is what turns cyclical frost into permanent frost. It is also the point at which looking stops being enough and a meter is needed.
- Sealed-system or compressor fault — Last, and the reason the order matters. It is the least likely cause on this roster and the only one that is not owner-serviceable at any level.
What to check first, second, third
- Listen at the freezer with the door open and the switch held in — The evaporator fan should run. Hearing it separates the two likeliest causes before any panel comes off.
- Check that the vents between the compartments are not blocked by food — A packed freezer will starve the fresh-food side on its own, and it costs nothing to rule out.
- Close the door on a strip of paper at three heights — Paper that pulls out freely anywhere along the seal means the door is not sealing there, and that is a cheap fix that looks like an expensive one.
Before you open anything
Safety
Nothing below happens with the machine live. Unplug it or switch off its breaker, and treat any capacitor as charged until it has been discharged properly.
Models in the KS family — Every listing below is in scope. The table is the boundary of this page's generalization.
Reference| Model number | Family key |
|---|---|
| KS-35F | auseo:refrigerator:ks |
| KS-40R | auseo:refrigerator:ks |
When to call a technician
Call once the air path is clean and the cabinet still will not hold. That is the point at which the fault has moved behind the liner, and behind the liner means a meter, a service manual and in the worst case refrigerant work.
Other pages for this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
