The short answer
A BRUF freezer that runs without freezing is usually an airflow, defrost or seal problem rather than a sealed-system failure. On this family the evaporator sits behind a single rear panel, which is why a stalled defrost shows up so quickly and ranks first here.
What you observe
- Contents softening while the unit runs continuously — Cold is being made and is not reaching the load.
- A frost sheet on the rear wall of the compartment — A stalled defrost cycle: the ice is now the blockage.
- Heavy ice build-up around the door opening — Warm moist air is getting in, which points at the seal or the door alignment.
- The unit never switches off — A cabinet that cannot reach its target runs constantly and works the compressor hard.
- NEAR MISS - the unit is silent and warm — That is a power or start-relay fault, and it is a different page.
Causes, most likely first on BRUF
- Stalled defrost and a frosted evaporator — Ranked first on the BRUF family: the compartment is served by one evaporator behind a rear panel on this family, so a defrost that stalls blocks the whole air path. What decides the order here is where melt water and cold air have to travel, and that is fixed across the family. What moves against the brand-generic order is lower down: condenser coil choked or its fan stalled sits above circulation fan failure here, because this family is a single build with fixed access points.
- Door seal, alignment or an over-packed load — Second: an upright cabinet loses its cold every time the door opens, so a seal that no longer meets shows as a slow warming rather than a sudden failure.
- Condenser coil choked or its fan stalled — Third: the machine compartment is shallow on this platform and the coil collects dust quickly in a utility space.
- Circulation fan failure — Fourth: where a fan is fitted, it is the moving part that wears, and it stops the cold reaching the top of the cabinet first.
- Sealed-system or compressor fault — Last: last, and the only cause here that is not owner-checkable, because refrigerant work is licensed work.
Check in this order, and why
- Empty a shelf and look at the rear wall for frost — A solid sheet rather than a light dusting confirms the likeliest cause immediately.
- Test the door seal with a sheet of paper all round — Cheap, fast, and a common finding on an upright cabinet.
- Leave a thermometer in the cabinet overnight — A single reading tells you little; an overnight low and high tells you whether it cycles at all.
- Confirm the cabinet is not packed against the vents — Do this last, but do it: blocked vents produce the same symptom as a failed fan.
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. Let ice melt rather than chipping at it, and treat the sealed system as off limits because refrigerant work is licensed work.
When to call a technician
A freezer holds food safely at 0 °F (−18 °C) or below. Seals, vents and the condenser are owner work. Call as soon as the defrost circuit or the sealed system is suspected, because both are tested live and refrigerant work is licensed work.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
