The short answer
On the BBB family a cabinet that runs without cooling is far more often an airflow or defrost problem than a dead compressor. That puts the evaporator and its fan above the sealed system in the order, which is the opposite end of the brand-generic list.
What you observe
- Cabinet warm while the unit is clearly running — Cold is being made somewhere and is not arriving, which is an airflow question.
- A sheet of frost on the evaporator or the rear wall — A stalled defrost: the ice itself is now blocking the air path.
- Cooling recovers for a day after the doors are left open — Near-diagnostic for a defrost fault: melting the ice restores the air path temporarily.
- The compartment is colder at the bottom than the top — An air-distribution problem rather than a failure to make cold.
- NEAR MISS - silent and not cold — That is a no-power or start-relay fault and belongs on a different page.
Causes, most likely first on BBB
- Blocked airflow from a frosted evaporator — Ranked first on the BBB family: a tall built-in cabinet depends on forced air along its whole height, so an iced evaporator starves the far end of the cabinet first. That is a family-level property rather than a model-level one, which is why it leads here. What moves against the brand-generic order is lower down: condenser coil choked or its fan stalled sits above door seals, door alignment and loading here, because this family is a single build with fixed access points.
- Evaporator or circulation fan not running — Second: these cabinets rely on more than one fan, so one dead fan leaves part of the cabinet cold and part of it warm.
- Condenser coil choked or its fan stalled — Third: a built-in cabinet vents through a narrow grille, so a blocked grille is as bad as a blocked coil.
- Door seals, door alignment and loading — Fourth: a heavy built-in door can drop on its hinges and leave a gap at one corner that is invisible until tested.
- Sealed-system or compressor fault — Last: last, and on a built-in it usually means the cabinet comes out of its housing.
Check in this order, and why
- Listen at the cabinet for the circulation fan — It separates the two likeliest causes before any panel comes off.
- Compare the two compartments against each other — One cold and one warm is an air path; both warm is the system or the condenser.
- Check nothing is packed against the rear vents — Blocked vents give exactly the same symptom as a failed fan and cost nothing to rule out.
- Test each door seal with a sheet of paper — Last, because it explains a struggling cabinet rather than a warm one.
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. Refrigerant work is licensed work, so leave the whole sealed system to a licensed technician, and call at once if you see oil at the compressor or smell burning.
When to call a technician
A refrigerator holds food safely at 40 °F (4 °C) or below and a freezer at 0 °F (−18 °C) or below; move perishables once the cabinet is above that. Cleaning a condenser and testing seals are owner work. Call as soon as the sealed system is suspected, because refrigerant work is licensed work.
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Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
